🌰 种子：植物随身带的"魔法行李箱"🌰 Seeds: A Plant's Magic Suitcase
上一片里，花朵谢了。其实它不是白开一场——花谢之后留下一件小礼物：种子。它像一只装好干粮、穿好盔甲、还睡着一个小生命的"魔法行李箱"。Last leaf, the flower faded. But it didn't bloom for nothing — it left behind a small gift: a seed. Think of it as a magic suitcase, packed with rations, wrapped in armour, with a tiny sleeping life inside.
第 1 步：行李箱里的三件宝贝Step 1: Three treasures in the suitcase
先把这只"行李箱"打开——里面到底装了什么？Let's open the suitcase first — what exactly is packed inside?
种子虽小，却是三件套：外面那层厚皮叫"种皮"，是盔甲，保护里面不被磕坏、不被虫咬；两片肥厚的"子叶"是粮仓，存着淀粉、蛋白质和油，够小生命吃到自己会光合作用为止；中间那株蜷着的小芽就是"胚"——胚芽朝上，将来长成茎和叶，胚根朝下，第一个钻出种皮去喝水。盔甲、粮仓、小旅客，齐了。A seed is a three-in-one kit. The thick outer layer, the "seed coat", is armour — it shields what's inside from knocks and hungry insects. The two chubby "cotyledons" are the pantry, stocked with starch, protein and oil to feed the young life until it can photosynthesise on its own. Curled up in the middle is the embryo: its baby shoot points up (future stem and leaves) and its baby root points down, ready to drill out first for water. Armour, pantry, passenger — all packed.
行李都齐了，可它为什么还睡着？要怎样才能叫醒它？The suitcase is packed — so why is it still asleep, and what wakes it up?
第 2 步：醒来的三把钥匙Step 2: Three keys to wake it up
科学家做过对照实验，答案很清楚：泡在水里却没空气，种子会闷坏；干干的没有水，它吸不胀、动不了；温度太低，它干脆继续睡。只有"水 + 空气 + 适宜温度"三把钥匙同时转动，种子才吸水膨胀、种皮裂开，胚根先探出来——这就是萌发。有意思的是，光不在钥匙串上：埋在土里黑漆漆的，它照样发芽。Controlled experiments give a clear answer: soak a seed with no air and it suffocates; keep it dry and it can't swell or move; keep it cold and it simply sleeps on. Only when "water + air + warmth" turn together does the seed swell, split its coat, and push out its baby root first — that's germination. Curiously, light is not on the key ring: buried in the dark soil, a seed still sprouts.
芽是发出来了，可它一辈子待在原地，后代怎么去更远的地方？It sprouted — but it stays rooted for life. How do its children travel far?
第 3 步：免费搭车去远方Step 3: Free rides to faraway places
种子们各有各的"顺风车"：蒲公英给每颗种子配一顶小降落伞，随风飘；椰子穿上厚厚的防水衣，随海浪漂到别的岛屿；苍耳长满倒钩，钩住路过的动物毛皮搭便车；凤仙花的果荚一碰就炸，把种子弹射出去。风、水、动物、弹射——植物不会走路，却把"搬家"这件事办得漂漂亮亮。Every seed has its own ride. Dandelions fit each seed with a tiny parachute and let the wind carry it; coconuts wear a thick waterproof coat and drift across the sea to other islands; burrs are covered in hooks that grab a passing animal's fur for a free lift; touch-me-not pods explode at a touch and fling their seeds away. Wind, water, animals, explosion — plants can't walk, yet they've mastered the art of moving house.
🎮 你来当实验室小助手（1 分钟）🎮 Your turn: lab assistant (1 minute)
道理讲完了。四盆种子各有各的毛病，点一点条件卡，找出每盆缺的是什么。Theory done. Four pots, each with its own problem — tap the condition cards and find out what each one is missing.
一句话记住它：种子 = 胚胎 + 粮仓 + 盔甲；水、空气、适宜温度，三把钥匙齐了才发芽，光不是必需品。Remember it in one line: a seed = embryo + pantry + armour; water, air and warmth are the three keys, and light is not required.
种皮是盔甲，子叶是粮仓，胚是蜷着的小生命The coat is armour, the cotyledons a pantry, the embryo the sleeping passenger萌发三条件：一定的水、充足的空气、适宜的温度——缺一不可Germination needs water, air and warmth — all three, or it waits传播四招：风、水、动物、弹射，都是为了去更远的地方Four travel tricks: wind, water, animals, and bursting pods
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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