Page 34 - 新思维科学学生用书3 样章

1.4 Plants need water and the right temperature

All plants need water

Every part of a plant

needs water. Water is Leaves use water
when they make
absorbed by the roots Leaves lose some food for the plant.
water to the
from the soil. Look at air around. The stem transports

the diagram to see how water to the leaves
water moves around a and flowers.

plant. The roots

Without enough water, absorb water The roots transport
from the soil.
plants will wilt and die. water to the stem.

Think like a scientist 1

How much water do plant stems use?

You will need: a narrow jar, five leafy stems, water, a ruler, sticky labels

Place the stems into the jar.

Use a ruler to measure the height of the water. 30

We call this the level of the water.
Predict what will happen to the water level 25

after five days. 20

Mark the water level at the start. Measure and

mark it at the same time each day. Start 15

Record how the water level changes.

Will you use mm, cm, m or just make a mark on 10
the label? Which is best? Why?

What happened at the end of the test? Was your 5

prediction right? Have you answered the question?

How much water do plant stems use? 0 cm

What kind of science enquiry was this?

33