GCSE OCR Gateway Biology (Combined Science) 2.4 Plant Tissues, Organs & Systems: A science club set up an experim

Question

A science club set up an experiment looking at the effect of acid rain on the growth of sunflower plants.

The diagram shows the apparatus they use.

3 sunflower plants

400 g soil

Pot

pH paper

‘Rainwater’ (mixture of sulfuric acid and water)

Beaker

This is the method they then used.

• Prepare 5 plant pots with 5 beakers of the ‘rainwater’ with varying pH values as shown in the table.

Pot with 3 sunflower plants

Beaker of 'rainwater'

pH Value

Pot A	 Beaker A	 6.0
Pot B	 Beaker B	 5.0
Pot C	 Beaker C	 4.0
Pot D	 Beaker D	 3.0
Pot E	 Beaker E	 2.0

• Water each pot twice a day from its corresponding beaker with similar amounts of ‘rainwater’.  
• Leave the pots in the same place with the same growing conditions for 14 days.  
• Measure the height of each sunflower every other day. Record the mean height of the 3 sunflowers in each pot.

(i) What is the independent variable in this investigation?

Put a tick (✓) in the correct box.

- Amount of light sunflowers receive
- Height of sunflowers
- Number of sunflowers
- pH of acid rainwater
- Volume of rainwater added to sunflowers

A science club set up an experiment looking at the effect of acid rain on the growth of sunflower plants - OCR Gateway - GCSE Biology (Combined Science) - Question 13 - 2022 - Paper 1

Worked Solution & Example Answer:A science club set up an experiment looking at the effect of acid rain on the growth of sunflower plants - OCR Gateway - GCSE Biology (Combined Science) - Question 13 - 2022 - Paper 1

What is the independent variable in this investigation?

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