第13课

第13课

Lesson 13

果实是怎样形成的

How is the fruit formed

1 .让我们搜集各种各样的果实 ，带到课堂上研究 。

Let's collect all kinds of fruits and bring them to class for research.

2.研究果实的共同特征 。

The common characteristics of fruits were studied.

切水果时要注意安全 ！

Pay attention to safety when cutting fruit

果实的共同特征 ：

The common characteristics of fruits are as follows

3.苹果是怎样长成的 ？

How do apples grow?

查阅有关传粉资料 ，可能会有所发现 。

If you look up the information about pollination, you may find something.

这么多小蜜蜂在花上忙碌着 ，他们在干什么 ？

So many little bees are busy on the flowers. What are they doing?

我想可能是……

I think it might be

    在自然条件下 ，植物传粉包括自花传粉和异花传粉两种形式 。传粉媒介主要有昆虫 （包括风，甲虫、蝇和蛾等 ）和风。此外 ，蜂鸟、蝙蝠和蜗牛等也能传粉 ，还有些植物通过水进行传播 。

Under natural conditions, plant pollination includes self pollination and cross pollination. The main pollinators were insects (including wind, beetle, fly and moth) and wind. In addition, hummingbirds, bats and snails can also pollinate, and some plants can be transmitted through water

花药   花药上的细胞产生花粉粒。

 anther      The cells on the anther produce pollen grains.

子房

ovary

胚珠

ovule

精子

sperm

花粉管

pollen tube

胚

embryo

花粉落到柱头上 。

The pollen falls on the stigma.

花粉粒萌发的花粉管伸入胚珠 ，精子穿过花粉管 ，与卵细胞融合 。

The pollen tube of pollen grains germinated extended into the ovule, and the sperm passed through the pollen tube and fused with the egg cell.

胚珠发育成种子 ，受精卵发育成胚 。

The ovule develops into seed and the fertilized egg develops into embryo.

子房和其他结构发育成果实。

Ovary and other structures develop into fruit.

哦 ，原来苹果是这样形成的 。

Oh, that's how apples are made.

其他植物的果实是怎样形成的 ？

How do the fruits of other plants form?

4.辨一辨哪些是果实 。

Identify the fruits.

看谁认识的果实多 。

See who knows more fruits.

5.选择一朵还没开放的丝瓜雌花，用塑料袋将这朵花罩起来 ，过一段时间后观察这朵花是否结出果实 。

Choose a female flower of Luffa that is not yet open, cover it with a plastic bag, and observe whether the flower bears fruit after a period of time.