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Plant Parts Investigation

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Plant Parts Investigation

A traveling science exhibit needs evidence about how plant parts help a plant survive. Use the investigation notes and your science knowledge to solve each challenge. For the test questions, answer from the evidence—not from guesses.

Plan and Predict

A class is testing how the amount of water affects a young bean plant. They use plants of the same type and size, the same soil, identical pots, and the same light. One plant gets 20 mL of water each day; another gets 40 mL. They record plant height after 14 days.

1.What is the independent variable in this investigation—the factor the scientists deliberately change?

2.Which factor should the scientists measure to compare plant growth?

The height of each plant after 14 days
The colour of each pot
The number of water drops each day
The temperature of the room

3.Name two factors, other than water, that should be kept the same to make this a fair test.

Collect and Interpret Evidence

After 14 days, the students measure the plants. Here are their results:

Daily water

Plant height after 14 days

20 mL

11 cm

40 mL

16 cm

4.How much taller was the plant receiving 40 mL each day than the plant receiving 20 mL each day? Show or explain your subtraction.

5.Choose the conclusion best supported by these results.

In this test, the plant given 40 mL daily grew taller than the plant given 20 mL daily.
Every plant grows best when it receives exactly 40 mL of water.
Water amount had no connection to the measured heights.
The 20 mL plant grew taller.

6.True or false: The results prove that 40 mL of water is the best amount for every bean plant in every situation. Explain briefly.

Trace the Plant’s Work

Use your knowledge of plant structures to answer the questions.

7.A plant begins to wilt after its roots are damaged. Explain how healthy roots help a plant survive.

8.Complete the pathway by filling in the missing plant part: soil water → roots → → leaves.

9.Match each plant part to its main function. Use each function once.

Roots
Stem
Leaves
Flowers

Help the plant reproduce; may develop into fruits and seeds
Capture light and make sugars by photosynthesis
Absorb water and minerals; anchor the plant
Support the plant and transport materials

10.Design a follow-up investigation to find out whether light affects bean plant growth. State what you would change, what you would measure, and one factor you would keep the same.