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Photosynthesis Investigation Worksheet

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Photosynthesis Investigation Worksheet

A class is testing how light affects photosynthesis in pondweed. Read the investigation and results, then use evidence to explain what happened. Do not taste or handle any experiment materials.

Investigation: Does light affect oxygen production?

Each beaker contained the same amount of pondweed and water mixed with a small amount of baking soda. Beaker A was placed beneath a lamp. Beaker B was covered so no light reached the pondweed. After 10 minutes, a student counted the bubbles rising from each plant. Bubbles are a useful clue because oxygen gas can be released during photosynthesis.

Beaker A — beneath the lamp Bubbles counted: 36

Beaker B — covered from light Bubbles counted: 4

Read the evidence

Baking soda dissolves in water and makes more carbon dioxide available to pondweed. Plants use light energy to make glucose from carbon dioxide and water. Oxygen is released as a product. Other conditions, such as plant size and water temperature, can also affect the results.

1.Which beaker produced more bubbles, and how many more bubbles did it produce than the other beaker?

2.What gas were the bubbles most likely to contain?

Oxygen
Carbon dioxide
Nitrogen
Hydrogen

3.Explain why adding baking soda could help the pondweed photosynthesise.

4.Choose the best conclusion supported by these results.

In these conditions, pondweed in light released more bubbles than pondweed without light.
Pondweed can never photosynthesise in darkness.
Baking soda alone caused every bubble.
Light makes pondweed stop growing.

5.Name one variable the students should keep the same in both beakers to make this a fair test.

6.The bubble count is not exactly the same every time an experiment is repeated. Give one reason why counting bubbles may not be a perfect measure of oxygen production.

7.Complete the photosynthesis summary: Plants use , and light energy to make ; is released.

8.A student says, “The covered pondweed made no oxygen because plants do not respire.” Identify the mistake in this explanation.

9.Suggest one improvement that would make the results more reliable, and explain how it would help.

10.Use the word bank to complete each photosynthesis role: sunlight, carbon dioxide, water, glucose and oxygen. The energy source is ________; the gas taken in by the plant is ________; the liquid absorbed by the roots is ________; the sugar made by the plant is ________; and the gas released is ________.

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Year 5

Photosynthesis Investigation Worksheet

Photosynthesis Investigation Worksheet

Investigation: Does light affect oxygen production?

Read the evidence

2 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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