Page 34 - 新思维科学学生用书5 样章

1.4 Seed germination

Think like a scientist 2

Investigate conditions needed for germination

You will need:

20 seeds, four glass jars filled with soil or sawdust, water, a measuring cup.

Place five seeds against the glass in each jar. Moisten the soil in three jars.

Part A
• Place the jar of dry soil and one jar

of moist soil in the same place.

• Check the moist soil every day to
make sure it does not dry out. Dry soil Seed Moist soil

• Observe the seeds every two days for eight days.

• Copy the table and record your observations.

Number of seeds germinated
Days Moist soil in Moist soil in
Moist soil Dry soil
cold place warm place

2

4
6

8

Part B

• Place one jar of moist soil in a cold place and one jar of moist soil in a warm
place.

• Repeat the steps written in Part A.

Questions

1 Answer these questions for both Part A and Part B:
a What did you measure?

b Which factor did you change?

c Which factors did you keep the same?
d What difference did you observe between the jars?

e Suggest a reason for your observations.

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