Page 27 - 新思维科学学生用书3 样章

1 Plants are living things

Plants need the right conditions

Plants need the right conditions leaves are wilting

to grow and be healthy. and yellow

The conditions they need

are the right amount of:

• warmth

• water

• light

• air.

A healthy plant has strong

roots, stems and leaves.

An unhealthy plant may

have yellow leaves. a healthy plant an unhealthy plant

The plant may wilt.

What do baby plants need?

The flowers of a plant make seeds. food store stem shoot

Inside each seed is a very small root

shoot and a very small stem shoot,

both ready to grow. The seed also
has a store of food for the baby

plant to start growing.

We call this germination. root shoot

The root shoot grows first to get

water. Then the stem shoot grows.
The diagram shows what is inside a seed.

The photograph shows how a seed starts growing. You can see a

root shoot growing downwards and a stem shoot growing upwards.

26