GCSE AQA Biology Photosynthesis: A scientist investigated the rat

Question

A scientist investigated the rate of photosynthesis of one type of tomato plant.

The tomato plants were grown in a greenhouse.

Table 2 shows the results.

Table 2

Percentage (%) concentration of carbon dioxide in the air

0.00
0.02
0.04
0.06
0.08
0.10
0.12

Rate of photosynthesis in arbitrary units

0
5
16
19
20
20
20

Give two control variables the scientist should have used in the investigation.

1

2

Which range of carbon dioxide concentrations caused the rate of photosynthesis to change the most?

Tick (✔) one box.

From 0.00% to 0.02%
From 0.02% to 0.04%
From 0.04% to 0.06%
From 0.06% to 0.08%

A scientist investigated the rate of photosynthesis of one type of tomato plant - AQA - GCSE Biology - Question 3 - 2010 - Paper 1