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Junior Cycle · Junior Cycle Science

Junior Cycle Science: Photosynthesis & respiration

How often Photosynthesis & respiration comes up on the Science papers, every year it was asked, and questions to try.

CL Asked on 3 of the last 6 Common Level papers, most recently in 2025.

Photosynthesis & respiration, Common Level(7 marks)

Quick ones on Photosynthesis & respiration.

(a)Which gas do plants take in for photosynthesis?
  1. Oxygen
  2. Carbon dioxide
  3. Carbon monoxide
(b)What is the green pigment in plants that absorbs light?
  1. Haemoglobin
  2. Chloroplast
  3. Chlorophyll
(c)Complete the word equation for respiration: glucose + oxygen → ?
  1. Carbon dioxide + water + energy
  2. Oxygen + starch + energy
  3. Chlorophyll + water + light energy
Show the answers

(a) Carbon dioxide

(b) Chlorophyll

(c) Carbon dioxide + water + energy

Your turn: Common Level questions on Photosynthesis & respiration.

Common Level

Asked on 3 of the last 6 Common Level papers, most recently in 2025.

Every paper, year by year

YearWhere it came up
2026Not asked
2025Q14
2024Q13
2023Q11
2022Not asked
2019Not asked

Links open the State Examinations Commission’s paper for that year.

More Photosynthesis & respiration questions

Photosynthesis & respiration, 3 marks

Which change would most likely speed up photosynthesis on a bright but cold day?

  1. Removing all of the carbon dioxide
  2. Moving the plant into the dark
  3. Raising the temperature a little
Show the answer

Raising the temperature a little

On a bright, cold day light is plentiful, so the low temperature slows the enzymes. Warming a little speeds them up. Removing carbon dioxide or light would stop photosynthesis.

Other Science topics

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