Have you ever noticed how plants and insects respond to light? Plants bend toward light. Insects fly toward light.
Living things also respond in other ways. The leaves on some trees respond to a change in season. In autumn, they change colors and then fall off the branches Animals also respond to a change in season. Squirrels save nuts for the winter. Bears sleep through the winter in a cave.
You respond to your environment in many ways, too. You may shiver if you are cold. What other ways do you respond to changes in your environment?18 Flowering Plants
What are the parts of a flower?
Flowers can have male parts and female parts. The female parts make eggs that become seeds. The male parts make pollen. Pollen is a powdery material that is needed by the eggs to make seeds. To make seeds, pollen and eggs must come together. The wind, insects, and birds bring pollen to eggs. Many animals love flowers’ bright colors. They also like a sugary liquid in flowers. This is called nectar. While they drink nectar, pollen rubs off on their bodies. As they move, some of this pollen gets delivered to the female flower parts.
Over time, the female parts turn into fruits that contain seeds. Animals often eat the fruits and the seeds pass through their bodies as waste. The animals do no know they are working for the plants by planting seeds as they travel to different places!
Useful words and expressions:
1. flowering 开花的
2. pollen 花粉
3. powdery 粉状的
4. sugar 含糖的，甜的
5. nectar花蜜，甘露
6. rub 磨擦