仙人掌生活在干旱沙漠里，为什么还偏偏在晚上张开气孔进行气体交换？
Cacti live in dry deserts, so why do they open their stomata at night to exchange gases?
这是 CAM 途径的巧妙设计。白天沙漠高温，气孔若张开会流失大量水分，所以仙人掌白天关闭气孔；到了凉爽的夜晚，气孔张开吸收二氧化碳，并把它固定成苹果酸储存在液泡里。白天气孔关闭时，苹果酸再脱羧释放出二氧化碳，正好供应卡尔文循环合成糖。二氧化碳的“取”与“用”被时间隔开，植物几乎不蒸腾也能完成光合作用，代价是固定同样多的碳需要消耗更多能量。
This is the elegance of CAM photosynthesis. By day the desert is hot, and open stomata would lose huge amounts of water, so cacti close them. On cool nights the stomata open and take in carbon dioxide, which is fixed into malic acid and stored in the vacuole. By day, with stomata shut, the malic acid decarboxylates and releases CO2, feeding the Calvin cycle. Carbon dioxide uptake and use are separated in time, so the plant photosynthesizes with almost no water loss, at the cost of needing more energy to fix the same amount of carbon.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通生物学》(陈阅增)
General Biology (Chen Yuezeng)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#CAM途径 #气孔 #苹果酸
C3、C4 和 CAM 光合途径分别适应什么环境？
What environments do C3, C4 and CAM photosynthesis each adapt to?
C3 为最普遍路径适合温和湿润；C4 在叶肉先固定为四碳化合物再送维管束鞘浓缩 CO2，适应高温强光以减少光呼吸；CAM 植物夜间开孔固定 CO2 白天关闭气孔，适应干旱。
C3 is the common path suiting mild moist climates; C4 first fixes CO2 into four-carbon compounds then concentrates it in bundle-sheath cells to curb photorespiration in hot bright conditions; CAM plants open stomata at night and close them by day to survive arid environments.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物生理学》教材
Plant Physiology (Taiz)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030440402（豆瓣书目条目: 植物生理学）
#C3 #C4 #CAM #光合
植物的次生代谢物有什么生物学意义？
What is the biological significance of plant secondary metabolites?
次生代谢物（如生物碱、黄酮、萜类）并非植物生长发育所必需，却在防御草食动物、吸引传粉者、抗逆中扮演关键角色。许多还是药物来源（如青蒿素、吗啡），是植物与环境互作的化学校兵器。
Secondary metabolites such as alkaloids, flavonoids, and terpenes are not required for basic growth yet play key roles in defense against herbivores, attracting pollinators, and stress tolerance. Many are drug sources, artemisinin, morphine, serving as plants' chemical tools in environmental interactions.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#次生代谢物 #生物碱 #防御 #药物
光合作用怎样把水分解放氧？
How does photosynthesis split water to release oxygen?
光系统 II 利用光能从水中夺取电子，经 Kok 循环（放氧复合体）每四次周转放出一分子 O₂，并把质子泵入类囊体腔建立跨膜梯度。Barber 在 2009 年综述了放氧中心的结构机理，Taiz 与 Zeiger 的《植物生理学》作系统讲解。
Photosystem II uses light to pull electrons from water; the Kok cycle (oxygen-evolving complex) releases one O₂ every four turnovers and pumps protons into the thylakoid lumen. Barber reviewed the OEC structure in 2009; Taiz & Zeiger explain it in 'Plant Physiology'.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger《植物生理学》；Barber 2009 年《化学评论》
Taiz & Zeiger, Plant Physiology; Barber (2009, Chemical Reviews)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030440402（豆瓣书目条目: 植物生理学）；本条出处含多部著作，此标识只担保上面点名的这
#光合作用 #放氧复合体 #光系统II
C4 植物相比 C3 植物有什么适应优势？
What adaptive advantage do C4 plants have over C3 plants?
C4 植物在炎热干旱环境中先用 PEP 羧化酶在叶肉细胞固定 CO2 为四碳化合物，再运至维管束鞘细胞释放供卡尔文循环，从而减少光呼吸损失。这种「CO2 浓缩」机制使玉米、甘蔗等在强光高温下比 C3 植物更高效。
In hot, dry conditions, C4 plants first fix CO2 into a four-carbon compound in mesophyll cells via PEP carboxylase, then release it in bundle-sheath cells for the Calvin cycle, cutting photorespiration losses. This CO2-concentrating mechanism lets corn and sugarcane outperform C3 plants under strong light and heat.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#C4植物 #C3植物 #光呼吸 #卡尔文循环
在植物的系统性获得抗性（SAR）中，水杨酸甲酯如何充当长距离移动信号？
How does methyl salicylate serve as the long-distance mobile signal in systemic acquired resistance (SAR)?
局部病原侵染后，感病叶中的水杨酸被SAMT酶甲基化为水杨酸甲酯（MeSA）。MeSA脂溶性较强，经韧皮部运抵远端健康组织，由酯酶SABP2水解还原为水杨酸；积累的水杨酸经受体NPR1诱导PR病程相关基因表达并建立预激发状态，使全株在二次侵染时启动更快更广的防御，构成植物系统性免疫的核心长距离信号通路。
After localized infection, salicylic acid in the diseased leaf is methylated by SAMT into methyl salicylate (MeSA). The lipophilic MeSA moves through the phloem to distant healthy tissue, where the esterase SABP2 hydrolyzes it back to salicylic acid; accumulated SA then acts via receptor NPR1 to induce pathogenesis-related genes and establish a primed state, letting the whole plant mount faster and broader defense upon secondary attack — the core long-distance circuit of plant systemic immunity.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Park 等，《Science》2007年烟草SAR中MeSA-SABP2移动信号研究（DOI: 10.1126/science.1147113）
Park et al., methyl salicylate is a critical mobile signal for plant systemic acquired resistance, Science 318:113-116 (2007), DOI: 10.1126/science.1147113
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1126/science.1147113：Methyl Salicylate Is
#系统性获得抗性 #水杨酸 #移动信号
许多植物的种子被鸟类吞下、随粪便排出后反而更容易萌发。这段消化道经历究竟改变了种子的什么？这对森林更新有何意义？
Many seeds germinate better after being swallowed by birds and passed in their droppings. What exactly does the journey through the gut change, and why does it matter for forest regeneration?
果肉常含萌发抑制物并维持高渗透压，黏附的果皮还阻碍水分进入；鸟类的消化去除果肉并轻度磨损种皮，从而打破休眠。同时种子被运离母树，避开亲株附近密集的专一天敌与幼苗竞争（Janzen–Connell效应），萌发率与建群机会同步提高，深刻影响森林更新的空间格局。
Fruit pulp often carries germination inhibitors and keeps seeds in an osmotically stressful environment, while clinging pericarp blocks water uptake. Gut transit strips the pulp and lightly abrades the coat, breaking dormancy; birds also carry seeds away from the parent tree, escaping dense natural enemies and seedling competition near adults (the Janzen–Connell effect). Germination and colonization chances rise together, shaping the spatial pattern of forest regeneration.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Traveset, A. (1998), Effect of seed passage through vertebrate frugivores guts on germination: a review, Journal of Biogeography 25(3): 473–486
Traveset, A. (1998), Effect of seed passage through vertebrate frugivores guts on germination: a review, Journal of Biogeography 25(3): 473–486
独立核验依据 · Independent verification: 核验依据 1 DOI 10.1078/1433-8319-00057
#种子传播 #过腹传播 #萌发率
为什么环割一圈果树的树皮，果实反而结得更大？
Why does cutting a ring of bark off a fruit tree make its fruit bigger?
树皮内侧的韧皮部承担“向下送粮”的运输：光合产物（糖）从叶片经筛管运往根部等“库”。环割切断了韧皮部，糖无法下运，就大量积存在切口以上的枝条和果实里，果实得到的糖更多，自然更大更甜；而负责向上输水的木质部在树皮内侧更深层，未被损伤，根系仍能靠储存物质存活。若环割过宽且不愈合，根部长期断粮最终会让整棵树枯死，所以生产中只做轻度环割或螺旋割。
The phloem inside the bark ships sugar downward: photosynthate moves from leaves through sieve tubes to sinks like the roots. Girdling severs the phloem, so sugar can no longer travel down and piles up in the branches and fruits above the cut, giving fruits extra sugar and making them bigger and sweeter. The water-carrying xylem lies deeper, beyond the cut, so it keeps working and the roots survive on stored reserves; if the cut ring is too wide and fails to heal, the roots are starved and the whole tree may die, which is why growers use only a light or spiral girdle.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#环割 #韧皮部 #源-库
什么是菌根？丛枝菌根真菌如何为植物提供好处？
What are mycorrhizae, and how do arbuscular mycorrhizal fungi benefit plants?
菌根是植物根系与真菌形成的互利共生结构，约90%的陆生植物都形成菌根。丛枝菌根真菌的菌丝侵入皮层细胞，形成树状丛枝结构，大幅扩大根系吸收面积，为植物提供磷、氮等矿质养分和水分；作为回报，植物把约20%的光合产物（糖类）提供给真菌。菌根还增强植物抗干旱、抗病原菌的能力，是陆地生态系统碳循环的重要环节。
A mycorrhiza is a mutualistic association between plant roots and fungi; about 90% of land plants form mycorrhizae. Arbuscular mycorrhizal fungi grow hyphae into cortical cells, forming tree-like arbuscules that vastly expand the absorbing surface, supplying the plant with phosphorus, nitrogen, and water. In return, the plant transfers roughly 20% of its photosynthates (sugars) to the fungus. Mycorrhizae also improve drought and pathogen resistance and play a major role in terrestrial carbon cycling.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature（菌根共生与植物营养综述）
Nature, review on mycorrhizal symbiosis and plant nutrition
#菌根 #丛枝菌根 #互利共生
花的演化与传粉者之间存在怎样的相互作用？
How have flowers and their pollinators co-evolved?
花的结构与传粉者形成了高度特异的共演化：虫媒花（如兰科植物）颜色鲜艳、有香味或花蜜，花瓣形态适应特定昆虫，如蜂兰花模拟雌蜂吸引雄蜂为其授粉；鸟媒花多为红色、无香而蜜量丰富；风媒花则花粉量大、柱头羽毛状而花被退化。这种传粉综合征使传粉更精确高效，也推动了开花植物的辐射演化。
Flower structure and pollinators show highly specific co-evolution: insect-pollinated flowers (e.g., orchids) are colorful, scented, or nectar-producing, with petal shapes fitted to particular insects; bee orchids mimic female bees to attract males for pollination. Bird-pollinated flowers tend to be red, scentless, and nectar-rich; wind-pollinated flowers produce abundant pollen, have feathery stigmas, and reduced perianths. These pollination syndromes make pollination more precise and efficient and drove the adaptive radiation of angiosperms.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#花的演化 #传粉综合征 #共演化
光周期现象如何影响植物的开花？
How does photoperiodism affect plant flowering?
许多植物通过感知昼夜长短（光周期）来决定开花时机：长日照植物在白昼超过临界值才开花，短日照植物则相反，日中性植物不受明显影响。这由叶片中的光敏色素接收信号、经激素传达到顶端分生组织调控。
Many plants time flowering by sensing day length: long-day plants bloom once days exceed a critical length, short-day plants do the opposite, and day-neutral plants are little affected. Leaf phytochromes receive the signal and relay it via hormones to the shoot apical meristem to regulate flowering.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#光周期 #开花 #光敏色素 #长日照
什么是植物的光周期现象？
What is photoperiodism in plants?
光周期现象指植物根据昼夜长短的变化来启动开花、休眠等发育过程。短日照植物在白天变短时开花，长日照植物则相反。这帮助植物在合适季节繁殖。
Photoperiodism is when plants use changes in day length to trigger developmental events like flowering or dormancy. Short-day plants flower as days grow shorter, while long-day plants do the opposite. This helps plants reproduce in the right season.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#光周期 #开花 #昼夜
苔藓植物（如葫芦藓）为什么被认为是高等植物中比较原始的类型？
Why are bryophytes such as mosses regarded as a relatively primitive group among land plants?
苔藓植物已具有多细胞结构和颈卵器、孢子囊，但还没有真正的根（只有假根），体内没有维管组织，无法远距离输导水分。它们的配子体（绿色植株）占优势且自养，孢子体寄生在配子体上。由于无维管束且受精依赖水，苔藓体型矮小，多生于阴湿处。
Bryophytes have multicellular structures, archegonia, and sporangia, but they lack true roots (only rhizoids) and vascular tissue, so they cannot transport water over long distances. Their dominant, photosynthetic generation is the gametophyte, and the sporophyte lives attached to it. Without vascular tissue and with water-dependent fertilization, bryophytes stay small and favor moist, shaded habitats.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#苔藓植物 #配子体 #无维管组织
风媒花和虫媒花在结构上各有什么适应？
What structural adaptations distinguish wind- and insect-pollinated flowers?
风媒花通常小而不显眼、花粉轻多、无花蜜，靠风随机传粉；虫媒花常有鲜艳花冠、气味和花蜜以吸引昆虫并精准传粉，提高成功率。
Wind-pollinated flowers are usually small, dull, produce abundant light pollen and no nectar, relying on random wind; insect-pollinated flowers sport bright corollas, scent and nectar to attract insects and raise pollination precision.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#传粉 #风媒 #虫媒
光合作用具体是怎么把光能变成糖的？分哪两步？
How exactly does photosynthesis turn light energy into sugar? What are its two stages?
光合作用在叶绿体里分两步进行。第一步是光反应，发生在类囊体膜上：光合色素吸收光能，把水分解并释放出氧气，同时生成能量货币 ATP 和还原力 NADPH。第二步是暗反应（卡尔文循环），发生在基质里：利用 ATP 和 NADPH 把二氧化碳固定并还原成糖。可以通俗理解为：光反应“充能”，暗反应“组装”，最后产物是含能量的有机物和氧气。
Photosynthesis happens in the chloroplast in two stages. The light reactions, on the thylakoid membrane, absorb light with photosynthetic pigments, split water and release oxygen, while producing the energy currency ATP and the reducing power NADPH. The dark reactions (Calvin cycle), in the stroma, use that ATP and NADPH to fix carbon dioxide and reduce it into sugar. In short, the light reactions charge the battery and the Calvin cycle builds the product, energy-rich organic matter plus oxygen.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通生物学》(陈阅增)
General Biology (Chen Yuezeng)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#光反应 #卡尔文循环 #叶绿体
光敏色素怎样调控植物开花？
How does phytochrome control plant flowering?
光敏色素是感受红光/远红光的可逆色素，植物借此判断昼夜长度（光周期）来决定开花时机，短日照与长日照植物响应相反。Borthwick 在 1952 年通过暗红光实验证实了这一光受体。
Phytochrome is a red/far-red reversible photoreceptor by which plants judge day length (photoperiod) to time flowering, with short- and long-day plants responding oppositely. Borthwick proved this receptor in 1952 with red/far-red experiments.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger《植物生理学》；Borthwick 1952 年论文
Taiz & Zeiger, Plant Physiology; Borthwick (1952)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#光敏色素 #光周期 #开花
植物没有内分泌腺，它们也有“激素”吗？植物激素在忙些什么？
Plants have no endocrine glands, so do they have "hormones" too? What do plant hormones do?
植物也有激素，虽然分子结构和作用方式与动物不同。生长素促进细胞伸长、维持顶端优势并引导向性生长；赤霉素让茎节间伸长、促进种子萌发；细胞分裂素促进细胞分裂；脱落酸促进休眠和关闭气孔；乙烯让果实成熟、叶片脱落。它们之间互相协作与对抗，共同调节植物的一生。
Plants do have hormones, though their chemistry and action differ from animals'. Auxin promotes cell elongation, keeps apical dominance and guides tropisms; gibberellins lengthen internodes and trigger seed germination; cytokinins drive cell division; abscisic acid promotes dormancy and closes stomata; ethylene ripens fruit and triggers leaf fall. Working together and against each other, they coordinate the plant's entire life.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通生物学》(陈阅增)
General Biology (Chen Yuezeng)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#植物激素 #生长素 #乙烯
植物没有眼睛和脑子，怎么知道根该往下、茎该往上？
Plants have no eyes or brain, so how do they know roots must grow down and shoots up?
答案是重力感受和生长素的重分配。根尖里有淀粉体颗粒，重力让它们沉到细胞底部，触发信号使生长素向下侧重新分布。生长素浓度对上侧和下侧的影响相反：对茎，较高浓度促进伸长，所以下侧长得快、茎向上弯；对根，高浓度反而抑制伸长，下侧慢、根就向下弯。这种由重力引导的定向生长叫向地性。
The answer lies in gravity sensing and auxin redistribution. Starch-filled granules (statoliths) in the root tip settle to the bottom of cells, triggering signals that redistribute the hormone auxin to the lower side. Auxin affects the two sides oppositely: in stems a higher concentration promotes elongation, so the lower side grows faster and the stem bends up; in roots a high concentration inhibits elongation, so the lower side lags and the root bends down. This gravity-guided directional growth is gravitropism.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#向地性 #生长素 #重力感受
生长素如何引起植物的向光性？
How does auxin produce phototropism in plants?
单侧光使生长素在茎尖横向运输到背光侧，背光侧细胞伸长更快使茎向光弯曲；这是植物对环境光方向的可逆生长响应。
Unilateral light drives auxin to redistribute to the shaded side of the shoot tip, where cells elongate faster and bend the stem toward light—a reversible growth response to light direction.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物生理学》教材
Plant Physiology (Taiz)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030440402（豆瓣书目条目: 植物生理学）
#向光性 #生长素 #植物激素
食虫植物怎样捕捉猎物？
How do carnivorous plants trap prey?
猪笼草、捕蝇草等以特化叶片形成陷阱，靠机械或化学刺激触发快速运动或分泌消化酶，把昆虫转化为氮磷等养分补足贫瘠生境。达尔文在 1875 年《食虫植物》中最早系统研究，Taiz 与 Zeiger 的《植物生理学》详述其机制。
Pitcher plants and Venus flytraps use specialized leaves as traps, springing shut or secreting enzymes on trigger to convert insects into nitrogen and phosphorus for poor soils. Darwin first studied them systematically in 'Insectivorous Plants' (1875); Taiz & Zeiger detail the mechanism.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger《植物生理学》；达尔文 1875 年《食虫植物》
Taiz & Zeiger, Plant Physiology; Darwin, Insectivorous Plants (1875)
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.5962/bhl.title.126335：Insectivorous plant
#食虫植物 #捕蝇草 #消化腺
植物激素生长素有什么主要功能？
What are the main functions of the plant hormone auxin?
生长素（主要是 IAA）调节细胞伸长、根和芽的形成以及向光性等生长反应。它在茎尖合成后极性运输，高浓度抑制侧芽、促进主茎生长，即“顶端优势”。
Auxin (mainly IAA) regulates cell elongation, root and shoot formation, and growth responses like phototropism. Made in shoot tips and transported polarly, high concentrations inhibit side buds yet promote the main stem—the “apical dominance.”
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#生长素 #植物激素 #顶端优势
种子是怎么传播的？
How are seeds dispersed?
植物借助风、水、动物和自身弹射等多种方式把种子送到远处。带刺或带肉的种子常黏附动物皮毛或被吃下后排泄。传播得越远，幼苗与母株争夺资源的可能越小。
Plants spread seeds far away using wind, water, animals, and even self-ejection. Sticky or fleshy seeds cling to animal fur or pass through digestion. The farther seeds travel, the less they compete with the parent plant for resources.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#种子 #传播 #繁殖
光合作用中的“光反应”和“暗反应”分别做什么？
What do the "light reactions" and "dark reactions" of photosynthesis each do?
光反应在类囊体膜上利用光能把水分解、产生 ATP 和 NADPH 并释放氧气；暗反应（卡尔文循环）在基质中利用这些能量将二氧化碳固定为糖类。二者配合使植物将光能转化为化学能储存。
Light reactions, in the thylakoid membrane, use light to split water, make ATP and NADPH, and release oxygen; the dark reactions (Calvin cycle), in the stroma, use that energy to fix CO₂ into sugars. Together they convert light energy into stored chemical energy.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
中国科学院《中国植物志》及植物生理学教材（Taiz & Zeiger）
Flora of China (Chinese Academy of Sciences); Taiz & Zeiger, "Plant Physiology"
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#光合作用 #光反应 #卡尔文循环
根瘤菌是怎样帮植物获得氮的？
How do rhizobia help plants obtain nitrogen?
豆科植物的根与根瘤菌形成共生根瘤，根瘤菌含有固氮酶，能把空气中的氮气转化为植物可利用的氨。植物提供根瘤菌糖类，根瘤菌供给氮素，这种合作减少了作物对化肥的依赖。
Legume roots form symbiotic nodules with rhizobia, whose nitrogenase converts atmospheric nitrogen into ammonia the plant can use. The plant supplies the bacteria with sugars while receiving nitrogen in return, a partnership that reduces reliance on fertilizer.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#根瘤菌 #固氮 #共生 #豆科植物
植物如何"感知"重力，让根总是朝下生长？
How do plants sense gravity and direct their roots downward?
根冠含有可沉降的淀粉体，重力使它们沉到细胞底部，触发生长素等信号不对称分布，令根下侧生长受抑、上侧相对较快，于是根向下弯曲。这就是正向重力性，让根扎向土壤深处。
The root cap contains sedimentable statoliths (starch-filled amyloplasts) that settle to the cell bottom under gravity, triggering an asymmetric distribution of signals such as auxin that slows lower-side growth and speeds the upper side, so roots bend downward. This is positive gravitropism, driving roots into the soil.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger，《植物生理学》（第6版，Sinauer，2010）
Taiz & Zeiger, Plant Physiology (6th ed., Sinauer, 2010)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#重力性 #根冠 #淀粉体 #生长素
植物的蒸腾作用有什么作用？
What is the function of plant transpiration?
蒸腾作用是水分从叶片气孔以水蒸气形式散失的过程，它借助蒸腾拉力把根部吸收的水分和矿物质向上输送到全身。同时蒸腾能降低叶片温度，是植物体内物质运输和水循环的重要环节。
Transpiration is the loss of water vapor from leaf stomata; the resulting pull lifts water and minerals absorbed by roots upward through the plant. It also cools leaves and is a key part of internal transport and the water cycle.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#蒸腾作用 #气孔 #蒸腾拉力 #水分运输
什么是被子植物特有的双受精现象？
What is "double fertilization," a process unique to flowering plants (angiosperms)?
双受精指花粉管释放的两个精子分别与胚囊中的两个细胞融合：一个精子与卵细胞结合形成合子（2n），将来发育为胚；另一个精子与中央细胞的极核融合形成三倍体（3n）胚乳核，发育为胚乳为胚供营养。双受精是被子植物区别于裸子植物等的独特生殖特征。
Double fertilization occurs when the two sperm cells delivered by the pollen tube each fuse with a different cell of the embryo sac: one sperm fertilizes the egg to form a diploid (2n) zygote that develops into the embryo, while the other fuses with the polar nuclei of the central cell to form a triploid (3n) endosperm nucleus, which develops into endosperm nourishing the embryo. It is unique to angiosperms.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通生物学》(陈阅增) 被子植物生殖
General Biology (Chen Yuezeng), angiosperm reproduction
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#双受精 #胚乳 #胚囊
根对植物有什么作用？
What do roots do for a plant?
根把植物固定在土壤里，并吸收水分和溶解的矿物质向上输送。有些植物的根还能储存淀粉等养分。根周围的共生菌还能帮助吸收难以获取的养分。
Roots anchor the plant in soil and absorb water and dissolved minerals to send upward. Some plants also store nutrients like starch in their roots. Symbiotic microbes around roots can help take up hard-to-get nutrients.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#根 #吸收 #固定
生长素对植物生长起什么作用？
What role does auxin play in plant growth?
生长素（如 IAA）是最主要的植物激素之一，能促进细胞伸长、影响向光性和向重力性。它在茎尖合成后向下运输，通过不均分布使植物朝光弯曲或根向下生长，也被广泛用于农业和园艺调控。
Auxin (such as IAA) is a major plant hormone that promotes cell elongation and shapes phototropism and gravitropism. Made in shoot tips and transported downward, its uneven distribution bends plants toward light or roots downward, and it is widely used in agriculture and horticulture.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#生长素 #植物激素 #向光性 #细胞伸长
相比苔藓植物，蕨类植物（如蕨、卷柏）在哪些方面发生了演化上的进步？
In what ways are ferns and other pteridophytes more advanced than bryophytes?
蕨类植物出现了真正的根、茎、叶和维管组织（木质部、韧皮部），是第一批维管植物，能长成高大的植株（如树蕨可达十余米）。但它们的孢子体虽占优势，精子仍靠鞭毛游动，受精离不开水，因此多分布在阴湿环境，靠产生大量孢子繁殖。
Ferns and allies evolved true roots, stems, leaves, and vascular tissue (xylem and phloem): they were the first vascular plants and can grow tall, with tree ferns reaching over ten meters. Although their sporophyte generation dominates, their flagellated sperm still swim to fertilize eggs, so reproduction depends on water; they therefore favor moist habitats and reproduce by releasing large numbers of spores.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《普通生物学》(陈阅增) 植物界章节
General Biology (Chen Yuezeng), kingdom Plantae
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#蕨类植物 #维管组织 #孢子繁殖
什么是苔藓植物？
What are bryophytes?
苔藓植物是一类没有真正维管束的矮小植物，包括苔、藓和角苔。它们靠孢子繁殖，通常生活在阴湿环境中，靠体表直接吸水。它们是陆地植物中较早登陆的类群之一。
Bryophytes are small plants without true vascular tissue, including mosses, liverworts, and hornworts. They reproduce by spores and usually live in damp, shady places, absorbing water directly through their surfaces. They were among the early plants to colonize land.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#苔藓 #孢子 #维管
树木的年轮能告诉我们什么？
What can tree rings tell us?
温带树木每年形成一圈深浅相间的年轮，其宽度反映当年的温度、降水和生长状况。通过树木年轮学，科学家可重建过去几百年的气候与火灾、虫害等历史，甚至为木材和文物定年。
In temperate zones, trees add one ring of light and dark wood per year, and its width reflects that year's temperature, rainfall, and growth. Through dendrochronology, scientists reconstruct centuries of climate and histories of fire or insect outbreaks, and even date timber and artifacts.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#年轮 #树木年轮学 #气候 #定年
种子植物和蕨类植物的主要区别是什么？
What are the main differences between seed plants and ferns?
种子植物（裸子与被子植物）通过种子繁殖，花粉使受精摆脱对水的依赖；蕨类则靠孢子繁殖，且精子需游动至卵细胞，受精离不开水。因此种子植物更能适应干旱陆地环境。
Seed plants (gymnosperms and angiosperms) reproduce via seeds, and pollen frees fertilization from needing water; ferns reproduce by spores, and their sperm must swim to the egg, requiring water. Seed plants thus better suit dry land.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
中国科学院《中国植物志》
Flora of China (Chinese Academy of Sciences)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030072733（豆瓣书目条目: 中国植物志）
#种子植物 #蕨类 #孢子
植物为什么会向光源弯曲生长（向光性）？
Why do plants bend toward light (phototropism)?
植物的向光性主要由生长素分布不均引起：茎尖感受光后，生长素更多移向背光侧，使该侧细胞伸长更快，茎便弯向光源。这帮助叶片获取更多阳光进行光合作用。
Phototropism mainly results from uneven auxin distribution: after the shoot tip senses light, auxin accumulates on the shaded side, where cells elongate faster, bending the stem toward light. This helps leaves capture more sunlight for photosynthesis.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#向光性 #生长素 #植物运动
为什么含羞草会合拢叶子？
Why does the sensitive plant close its leaves?
含羞草受到触碰时，叶枕细胞会迅速失水使叶片下垂合拢，这是一种快速运动。它被认为能吓退食草动物或减少伤害。这种反应由电信号和水压变化共同驱动。
When touched, the sensitive plant rapidly loses water from cells at its leaf bases, causing the leaves to droop and fold, a quick movement. It is thought to startle herbivores or reduce damage. The response is driven by electrical signals and water-pressure changes.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#含羞草 #感震 #运动
裸子植物（如松树、银杏）的裸指什么？
What does the "naked" in "naked-seed plants" (gymnosperms) refer to?
裸指它们的胚珠和种子裸露，不包被在子房或果实里，种子直接着生在大孢子叶（珠鳞）上。裸子植物以种子繁殖，摆脱了对水的依赖；花粉萌发长出花粉管，把精子直接送到胚珠完成受精。松树等多数裸子植物靠风传粉。
"Naked" means their ovules and seeds are exposed, not enclosed in an ovary or fruit; the seeds sit directly on the surface of scales (megasporophylls). Gymnosperms reproduce by seeds and no longer depend on water for fertilization: pollen germinates to form a pollen tube that carries the sperm directly to the ovule. Most gymnosperms such as pines are wind-pollinated.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#裸子植物 #种子 #花粉管
植物有哪些常见的种子传播方式？各有什么适应意义？
What are the common mechanisms by which seeds are dispersed, and what is their adaptive value?
种子传播方式多样：风传播（蒲公英冠毛、枫树翅果）利于开阔环境远距离扩散；动物传播（鸟类取食浆果后随粪便排出、苍耳钩刺挂附兽毛）实现定向扩散；机械弹射（凤仙花、喷瓜）把种子抛离母株；水流传播（椰子）可跨海漂移。扩散能减少后代与母株及彼此的竞争、开拓新栖息地，是种子植物成功扩张的重要策略。
Seeds are dispersed in many ways: by wind (dandelion pappus, maple samaras), ideal for long-distance spread in open habitats; by animals (birds eating berries and defecating seeds, burrs like cocklebur attaching to fur), giving directed dispersal; by explosive mechanisms (impatiens, squirting cucumber) that fling seeds away; and by water (coconuts) allowing ocean crossing. Dispersal reduces competition with the parent and among siblings and opens new habitats, a key strategy in the success of seed plants.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
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《普通生物学》(陈阅增) 种子植物章节
General Biology (Chen Yuezeng), seed plants
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040583151（豆瓣书目条目: 陈阅增普通生物学）
#种子传播 #动物传播 #适应演化
植物没有可移动的免疫细胞，它们如何察觉病原入侵并发动防御？请区分其两类主要免疫反应。
Plants lack mobile immune cells—how do they sense pathogen attack and mount defense? Distinguish their two major immune responses.
植物依靠两层先天免疫：第一层由膜上的模式识别受体识别鞭毛蛋白片段、几丁质等病原保守分子，触发基础免疫，表现为气孔关闭、活性氧迸发和胼胝质沉积；第二层由抗病基因产物按“基因对基因”方式识别病原效应蛋白，引发更剧烈的过敏反应并可建立系统性获得抗性。识别与逃逸的反复较量构成植物与病原体的军备竞赛。
Plants run two tiers of innate immunity. First, membrane pattern-recognition receptors detect conserved microbial molecules such as flagellin fragments and chitin, triggering baseline defense marked by stomatal closure, reactive-oxygen bursts and callose deposition. Second, resistance-gene products recognize pathogen effectors in the gene-for-gene fashion, launching a sharper hypersensitive response and systemic acquired resistance. The constant interplay of recognition and evasion drives the plant-pathogen arms race.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Jones 与 Dangl：《植物免疫系统》，Nature，2006
Jones & Dangl, 'The plant immune system', Nature, 2006
#植物免疫 #先天免疫 #基因对基因
堇菜、延龄草等许多野花的种子带着一小块富含油脂的附器，蚂蚁会把它搬回巢——植物为什么“雇用”蚂蚁当搬运工？
Seeds of many wildflowers such as violets and trilliums carry a small fatty appendage that ants haul off to their nests — why do plants 'hire' ants as couriers?
这个附器叫油质体，富含油脂，脂肪酸组成酷似昆虫猎物的化学信号，对蚂蚁有强烈吸引力。工蚁把种子拖进巢，吃掉油质体，再把完好的种子丢在巢内垃圾堆或废弃巢室——那里远离聚在母株周围的食种子动物，养分充足又受土壤庇护。植物用少量组织换来传播距离与安全的育苗点，蚂蚁得到食物，两相得益。
The appendage is an elaiosome, rich in lipids whose fatty-acid makeup mimics the chemical signature of insect prey, making it irresistible to ants. Workers drag the seed into the nest, eat the elaiosome and discard the intact seed in refuse chambers or abandoned galleries — spots far from the seed predators gathered around the parent plant, nutrient-rich and sheltered underground. The plant trades a scrap of tissue for dispersal distance and a safe germination site; the ants gain a meal.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
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Beattie：《蚁—植互利共生的进化生态学》，Cambridge University Press，1985
Beattie, 'The Evolutionary Ecology of Ant-Plant Mutualisms', Cambridge University Press, 1985
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL5369647W：The evolutionary ecolog
#种子传播 #油质体 #蚁播
捕蝇草之类的食虫植物是怎样"抓虫"的？
How do carnivorous plants like the Venus flytrap catch their prey?
食虫植物生活在缺氮的贫瘠环境，叶片特化成带刺毛的夹子；当昆虫两次触碰感应毛触发动作电位，夹子迅速闭合并分泌消化酶，吸收氮等养分。这是对贫瘠生境的极端适应，而非"会吃人"。
Carnivorous plants like the Venus flytrap live in nitrogen-poor habitats; their leaves are modified into spiny traps that snap shut when an insect triggers the sensory hairs twice, firing action potentials, then secrete enzymes to absorb nitrogen. It is an extreme adaptation to poor soils, not a man-eater.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger，《植物生理学》（第6版，Sinauer，2010）
Taiz & Zeiger, Plant Physiology (6th ed., Sinauer, 2010)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#食虫植物 #捕蝇草 #营养适应 #动作电位
为什么夏天站在大树下会特别凉快？这和蒸腾作用有关吗？
Why is it especially cool under a big tree in summer? Is transpiration involved?
大树下的凉快主要来自两个叠加的效果：树冠遮阴挡住了阳光直射，而蒸腾作用也在帮忙。水从叶片气孔蒸发时要吸收大量热量（汽化潜热），相当于给叶片表面“制冷”，也让树荫下的空气变得湿润凉爽。同时这股蒸腾拉力像水泵一样把水分从根部抽上数十米高的树冠，完成水分运输。
The coolness under a big tree comes from two stacked effects: the canopy blocks direct sunlight, and transpiration helps too. When water evaporates from leaf stomata it absorbs a lot of latent heat, acting like a built-in air conditioner that chills the leaf and leaves the air beneath moist and cool. The same transpiration pull works like a pump, lifting water from the roots to a crown dozens of meters high.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#蒸腾作用 #气孔 #水分运输
种子休眠有什么生物学意义？
What is the biological significance of seed dormancy?
种子休眠使其延迟到温度、水分等条件适宜时才萌发，避免恶劣天气中死亡，并让种子借动物或水流扩散到更远的地方。
Dormancy delays germination until temperature and moisture are favorable, avoiding death in harsh conditions and letting seeds disperse farther via animals or water.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
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《植物生理学》教材
Plant Physiology (Taiz)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030440402（豆瓣书目条目: 植物生理学）
#种子休眠 #萌发 #扩散
向日葵为什么跟着太阳转？
Why does a sunflower turn to follow the sun?
幼小的向日葵在白天会随太阳从东转到西，这是因为茎两侧生长速度不均造成的运动。这样能让叶片接受更多阳光进行光合作用。花成熟后通常会固定朝向东方。
Young sunflowers track the sun from east to west during the day because the two sides of their stem grow at uneven rates. This lets the leaves catch more sunlight for photosynthesis. Once mature, the flower usually settles facing east.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#向日葵 #向光性 #太阳
树木的年轮是怎样记录年岁的？
How do tree rings record a tree's age and history?
在四季分明的地区，树木春夏季长得快、材质疏松色浅，秋冬季长得慢、材质致密色深，一年形成一圈明暗相间的年轮。数清年轮即可知树龄，年轮的宽窄还能反映当年的气候冷暖干湿。
In seasonal climates, trees grow fast in spring/summer (light, loose wood) and slow in fall/winter (dark, dense wood), forming one light-dark ring per year. Counting rings reveals age, and their width reflects that year's climate.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
中国科学院《中国植物志》；国际树木年轮数据库（ITRDB）
Flora of China (Chinese Academy of Sciences); International Tree-Ring Data Bank (ITRDB)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787030072733（豆瓣书目条目: 中国植物志）；本条出处含多部著作，此标识只担保上面点名的这
#年轮 #树木年龄 #气候记录
植物为什么是绿色的？
Why are plants green?
植物的绿色来自叶绿素，这种色素能吸收阳光用于光合作用。叶绿素主要吸收红光和蓝光，却反射绿光，所以叶子看起来是绿的。没有叶绿素，植物就无法制造养分。
The green color of plants comes from chlorophyll, a pigment that captures sunlight for photosynthesis. Chlorophyll mainly absorbs red and blue light but reflects green, so leaves look green. Without chlorophyll, plants could not make their own food.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#叶绿素 #光合作用 #绿色
植物不会逃跑，它们怎么保护自己不被吃掉？
Plants cannot run away—how do they protect themselves from being eaten?
植物演化出物理防御（刺、厚皮、蜡质层）和化学防御（生物碱、单宁等让叶子变苦有毒的二次代谢物）。有些植物被啃食后还会释放气味信号，提醒旁边的同伴提前做好准备。
Plants evolved physical defenses (thorns, thick bark, waxy cuticles) and chemical ones (alkaloids, tannins, and other bitter or toxic secondary metabolites). Some even release volatile signals when eaten, warning neighboring plants to brace themselves.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger，《植物生理学》（第6版，Sinauer，2010）
Taiz & Zeiger, Plant Physiology (6th ed., Sinauer, 2010)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#植物防御 #二次代谢物 #诱导防御 #适应性
种子是怎么发芽长大的？
How does a seed sprout and grow?
种子里藏着小芽和存好的食物，遇到足够的水、温暖和空气就会苏醒：先喝饱水胀破种皮，再伸出根扎进土里、长出茎和叶子。等叶子能自己晒太阳做食物，小苗就不再靠种子里的存粮了。
A seed hides a tiny sprout and stored food; with enough water, warmth, and air it wakes up, soaking up water to split the coat, then sending a root into soil and pushing up a stem and leaves. Once the leaves can make their own food from sunlight, the seedling no longer needs the seed's stored supply.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#种子 #发芽 #根 #幼苗
光合作用是怎么把阳光变成食物的？
How does photosynthesis turn sunlight into food?
绿色植物在叶绿体中利用光能把二氧化碳和水合成葡萄糖，并释放氧气，这个过程叫光合作用。它把太阳能转化为储存在糖里的化学能，是几乎所有食物链的能量源头。
In chloroplasts, green plants use light energy to combine carbon dioxide and water into glucose while releasing oxygen, this is photosynthesis. It converts solar energy into chemical energy stored in sugar and is the energy source for nearly all food chains.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《植物学》
Campbell Biology
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040581683（豆瓣书目条目: 植物学）
#光合作用 #叶绿体 #葡萄糖 #氧气
植物细胞壁的主要成分是什么，有什么功能？
What is the main component of the plant cell wall and what does it do?
植物细胞壁主要由纤维素构成的微纤丝网络组成，提供机械支撑、维持细胞形状和抵御病原，并赋予植物挺立姿态。
The plant cell wall is mainly a cellulose microfibril network that provides mechanical support, maintains cell shape, resists pathogens and gives plants their upright posture.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#细胞壁 #纤维素 #支撑
树木为什么在秋天落叶？
Why do trees lose their leaves in autumn?
在寒冷或干旱季节，落叶树会主动脱落叶子以减少水分流失和能量消耗。叶片中的叶绿素分解后，原本被遮盖的黄色、红色色素显现出来。这是一种越冬的适应策略。
In cold or dry seasons, deciduous trees shed their leaves to reduce water loss and energy use. As chlorophyll breaks down, the yellow and red pigments that were hidden become visible. It is an adaptation for surviving winter.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#落叶 #秋天 #色素
植物是怎样制造食物的？
How do plants make their food?
植物通过光合作用，在叶片里用阳光把二氧化碳和水转化成糖和氧气。这一过程发生在叶绿体中，是地球上绝大多数生命的能量来源。植物因此被称为生产者。
Through photosynthesis, plants use sunlight in their leaves to convert carbon dioxide and water into sugar and oxygen. This process happens in the chloroplasts and is the energy source for most life on Earth. Plants are therefore called producers.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#光合作用 #糖 #叶绿体
木质部和韧皮部各自运输什么物质？
What substances do xylem and phloem each transport?
木质部主要把根吸收的水分和无机盐向上运输到地上部分，韧皮部则把叶片光合作用制造的糖类等有机物运送到全身各器官。
Xylem mainly carries water and minerals upward from roots, while phloem distributes sugars and other organic products made by photosynthesis to organs throughout the plant.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#木质部 #韧皮部 #运输