好奇为什么 · 4-8 岁

菜园里的花为什么会变成瓜

蜜蜂带给小花的一场奇妙魔法

科普启蒙约 12 分钟4-8 岁中英双语

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清晨的菜园里，叶片上滚着晶莹的露珠。小树蹲在黄瓜架下，好奇地指着一朵金黄色的小花。花朵旁边，正挂着一根顶花带刺的嫩黄瓜。

In the morning garden, dewdrops rolled on broad green leaves. Xiao Shu crouched beneath the cucumber trellis, pointing curiously at a bright yellow flower next to a crisp, prickly cucumber.

清晨的菜园里，叶片上滚着晶莹的露珠。小树蹲在黄瓜架下，好奇地指着一朵金黄色的小花。花朵旁边，正挂着一根顶花带刺的嫩黄瓜。

In the morning garden, dewdrops rolled on broad green leaves. Xiao Shu crouched beneath the cucumber trellis, pointing curiously at a bright yellow flower next to a crisp, prickly cucumber.

“奶奶，柔软轻薄的花瓣，怎么会变成硬邦邦、脆生生的长黄瓜呢？”小树仰起小脸问。难道小花喝足了水，就会像气球一样吹大吗？

"Grandma, how can soft, tender petals turn into a long, crunchy cucumber?" Xiao Shu asked, tilting his head. Did the blossoms puff up like balloons after drinking water?

奶奶笑着摘下一副放大镜递给小树：“仔细看看同一根藤上的黄瓜花，它们长得可不是一模一样哦。”小树贴近花丛，睁大了好奇的眼睛。

Grandma smiled and handed Xiao Shu a magnifying glass. "Look closely at the yellow blossoms along the vine. They are not all the same!" Xiao Shu leaned in with eager eyes.

第一朵花连着一根细细长长的花梗，花心中央立着几个小柱子，上面沾满了黄色的小粉末。奶奶说：“这是雄花，它负责准备神奇的花粉。”

The first flower grew on a slender, straight green stalk. Inside its cup sat tiny stamens dusted with golden powder. "This is a male flower," Grandma said. "It prepares pollen!"

小树又看另一朵花，忍不住叫起来：“哇！这朵花底下藏着一根带毛的小黄瓜！”奶奶点头笑道：“这是雌花，底下的小瓜就是植物的‘子房’。”

Xiao Shu inspected another flower and gasped, "Look! Under this blossom sits a tiny, fuzzy baby cucumber!" Grandma nodded. "That's a female flower. The tiny green pod below is called an ovary."

子房里有小小的胚珠。奶奶说：“咱们种的这种黄瓜，通常要经过授粉、受精，小瓜才能继续长好。我们等一等，看看谁来帮忙。”

The ovary holds tiny ovules. “This cucumber variety usually needs pollination and fertilization for fruit to grow well,” Grandma said. “Let’s watch for a helper.”

雄花准备了金黄的花粉，雌花张开了黏糊糊的柱头。可是，花朵没有脚，也不会走动，雄花的花粉怎么才能送进雌花的摇篮里呢？

The male flower carried golden pollen, while the female flower opened a sticky stigma in its center. But flowers have no feet! How could pollen travel over to the female blossom?

嗡嗡嗡，一只蜜蜂落进雄花，寻找花蜜和花粉。它身体上的细毛蹭到了花粉，飞走时，也把一些花粉带走了。

A honeybee buzzed into a male flower, gathering nectar and pollen. Some pollen brushed onto its body hairs and traveled away with it.

蜜蜂喝饱了，又欢快地飞向雌花。它在雌花的花心里蹭来蹭去，身上带的花粉，不知不觉就粘在了雌花黏黏的柱头上。授粉成功啦！

Buzzing cheerfully, the bee flew over to the female flower. As it wiggled inside, golden pollen brushed off onto the sticky stigma. Pollination was complete!

花粉落在合适的柱头上，会长出花粉管，向胚珠伸去。雄性生殖细胞沿着管子到达，与卵细胞结合，这一步才叫受精。授粉和受精可不是同一件事。

On a suitable stigma, pollen grows a tube toward an ovule. A male reproductive cell travels down the tube and joins an egg cell: fertilization. Pollination and fertilization are different steps.

完成了神圣的任务，黄色的花瓣开始失去光彩。几天后，花瓣慢慢缩紧、变褐，干枯地贴在瓜尖上。变成果实的不是花瓣，而是底部的子房！

With its mission accomplished, the yellow petals slowly lost their bright sheen. Days later, they wrinkled and dried into a little brown cap. It wasn't the petals turning into the cucumber—it was the ovary beneath!

得到受精信号的小摇篮，像吹起的小哨子一样苏醒了！子房里的细胞不停地分裂、长大，小瓜以肉眼可见的速度一天天变粗、变长。

Having received the spark of life, the little cradle awakened! Its tiny cells divided and expanded, puffing the baby cucumber thicker and longer with every passing day.

小树在泥土里捡起一朵掉落的花：“那雄花为什么不长瓜呢？”奶奶摸摸他的头：“雄花送出花粉后，使命就完成啦，它没有子房，只能落回泥土。”

Xiao Shu picked up a fallen yellow blossom from the dirt. "Why didn't this male flower grow a cucumber?" Grandma patted his shoulder. "Once it shares its pollen, its work is done. It has no ovary to grow fruit!"

小树指着一根发黄的小瓜：“它为什么没长好？”爷爷说：“可能没能顺利授粉受精，也可能是水分、温度或营养等不合适，要仔细观察才能判断。”

Xiao Shu pointed to a yellowing baby cucumber. “Why did it stop?” “Pollination or fertilization may have failed,” Grandpa said. “Water, temperature, or nutrients might also be unsuitable. We need to look carefully.”

“那世界上所有瓜都要蜜蜂帮忙吗？”小树眨着眼问。爷爷笑着补充：“有些大棚里的黄瓜品种很特殊，即使没有授粉也能自己结果，这叫‘单性结实’呢！”

"Do all cucumbers in the world need bees?" Xiao Shu blinked. Grandpa smiled, "Some special greenhouse cucumber varieties can grow fruit even without pollination—scientists call it parthenocarpy!"

“不过，咱家菜园里的黄瓜，光有蜜蜂可不够！”小树提起小水桶。宽宽的绿叶要晒大太阳制造糖分，根系要在大地里喝饱水、吸足肥料，瓜才能脆甜多汁。

"In our garden, bees aren't the only helpers!" Xiao Shu said, lifting his small watering can. Broad leaves soaked up sunshine to make plant food, while roots drank water and soil nutrients to make crisp, juicy cucumbers.

一天，两天，三天……小黄瓜一天一个样！细软的小绒毛变成了结实的小毛刺，翠绿的身躯越来越沉，笔直地垂在青翠的瓜棚下。

One day, two days, three days passed... The baby cucumber transformed! Soft fuzz turned into tiny firm prickles, and the plump, emerald body grew heavy, hanging straight from the vine.

终于到了采摘的时刻！小树小心翼翼地托住大黄瓜，奶奶用剪刀“咔嚓”一剪。在顶端，那朵干枯的小黄花还像顶遮阳帽一样，顽皮地戴在瓜尖上。

Harvest time at last! Xiao Shu cupped a big, cool cucumber in both hands while Grandma snipped the stem with garden shears. At the tip, the dried little flower still clung like a miniature sunhat.

爸爸切开采下的嫩黄瓜。小树看到里面软软的小籽。奶奶说：“胚珠会发育成种子，但咱们吃的嫩黄瓜还没熟透，这些小籽通常还不能拿来播种。”

Dad sliced the young cucumber. Xiao Shu saw soft seeds inside. “Ovules develop into seeds,” Grandma said, “but cucumbers picked for eating are still immature. These soft seeds usually are not ready for sowing.”

爷爷指着藤上另留的一根瓜：“留种的要继续长，等瓜和种子充分成熟再处理。”小树点头：黄花、瓜、种子、新藤，菜园的故事还能接着讲下去。

Grandpa pointed to another cucumber left on the vine. “For seed, we let this one and its seeds mature fully before preparing them.” Xiao Shu smiled: flower, fruit, seed, vine—the garden story could begin again.

这类黄瓜授粉后还需完成受精，子房发育成果实、胚珠发育成种子；有些黄瓜品种也能不经受精结果。

In this cucumber variety, pollination is followed by fertilization; the ovary becomes fruit and ovules become seeds. Some varieties can form fruit without fertilization.

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