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Plant Growth Experiment

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Plant Growth Experiment

Wiremu, Freya and Keira are travelling around Aotearoa. They pack three identical seed pots to investigate how light affects plant growth. Read the plan and results, then answer the questions. Use evidence from the results where asked.

The fair test

They put the same kind of seed in each pot, with the same amount of potting mix and water. The pots stayed in the same place and were checked for 10 days. The only change was how much light each pot received. They measured the seedlings at the end.

Pot

Light received

Seedling height

A

Bright light

8 cm

B

Some light

6 cm

C

Very little light

3 cm; pale yellow leaves

Investigate the results

1.What was the one thing the travellers changed between the three pots?
2.Name two things they kept the same to make this a fair test.
3.Which seedling grew tallest, and how tall was it?
4.How many centimetres taller was Pot A’s seedling than Pot C’s seedling? Show or explain your thinking.
5.Which pot’s seedling had pale yellow leaves? What does the results table suggest about its light?
6.Choose the best conclusion supported by the results.
  • In this test, the seedling with bright light grew tallest.
  • Seeds cannot grow unless they receive no light.
  • The amount of water made Pot A grow tallest.
7.Why should the travellers change only one condition in a fair test?
8.A gust of wind tips over Pot B and spills some of its water. Is Pot B still a fair comparison? Explain.
9.Write one question the travellers could investigate next about plant growth. Name one thing they would change.
10.Draw a simple bar graph of the three seedling heights. Label the pots and show the height in centimetres.

3 printable pages

  • Plant Growth Experiment, page 1 of 3: The fair test, Investigate the results

    Page 1

  • Plant Growth Experiment, page 2 of 3: 3. Which seedling grew tallest, and how tall was it?

    Page 2

  • Plant Growth Experiment, page 3 of 3: 9. Write one question the travellers could investigate next about plant growth. Name

    Page 3

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