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Plant Growth Investigation

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Plant Growth Investigation

Talia, Sione and Arjun are testing how light affects seedlings at a fire station. They will change one condition at a time, keep other conditions the same, and measure each seedling from the soil to its tallest point. Use the results and your science knowledge to solve the challenge.

Plan a fair test

The team uses the same kind of seed, pot, soil and amount of water for each seedling. Only the amount of light changes.

1.What is the one condition the team changes to investigate plant growth?
2.Why should both seedlings get the same amount of water?
3.Choose the best prediction before the test begins.
  • The seedling with light may grow greener and stronger.
  • The seedling without light will make its own sunlight.
  • Both seedlings will grow exactly the same in every way.

Read the results

After 14 days, the team records each seedling's height and appearance.

Seedling

Height on day 1

Height on day 14

Appearance on day 14

By the window

2 cm

8 cm

Green leaves; upright stem

In the dark cupboard

2 cm

6 cm

Pale leaves; bent stem

4.How many centimetres did the seedling by the window grow? Show or explain your calculation.
5.How many centimetres did the seedling in the dark cupboard grow?
6.Which seedling grew more, and by how many centimetres?
7.True or false: The dark-cupboard seedling did not grow at all.
TrueFalse
8.Fill in the blanks: The seedling without light was and its stem was .
9.What can the team conclude from these results about light and seedlings? Use at least one result as evidence.
10.The team wants to test whether water affects growth next. What should they change, and name one thing they should keep the same?

2 printable pages

  • Plant Growth Investigation, page 1 of 2: Plan a fair test, Read the results

    Page 1

  • Plant Growth Investigation, page 2 of 2: 4. How many centimetres did the seedling by the window grow? Show or explain your…

    Page 2

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