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Question 25

Which set names the three main factors that affect the rate of photosynthesis?

  1. Light intensity, carbon dioxide concentration and temperatureCorrect answer
  2. Amount of soil, amount of fertiliser and soil depth
  3. Oxygen concentration, wind speed and air pressure
  4. Light intensity, oxygen concentration and amount of fertiliser

Explanation

The reaction needs light for its energy and a gas from the air as a raw material, and like any reaction it speeds up as its particles gain energy with warmth, so those three set how fast it runs. Fertiliser supplies mineral ions that a plant needs in order to grow, but adding more of them does not drive the sugar-making reaction faster, and the gas the reaction gives off is a product rather than a requirement.

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