What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to plant nutrition. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on plant nutrition, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Writing light or chlorophyll on the left-hand side of the equation as a raw material.
- Giving "carbon dioxide and water" as the products. Those are the raw materials, and they are the products of respiration.
- Saying plants respire only at night. Plants respire constantly; in daylight photosynthesis simply outpaces it.
- Saying chlorophyll is used up during photosynthesis.
- Swapping the roles of nitrate and magnesium ions.
- Using a black container as the control when testing whether carbon dioxide is needed, which changes two variables at once.
- Forgetting to destarch the plant before a starch test.
- Leaving out the ethanol step, or heating ethanol with a naked flame, which is a safety mark as well as a method mark.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Plant nutrition revision notes.