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Question 31

A grower pipes extra carbon dioxide into a brightly lit, warm greenhouse. What effect does that have on the rate of photosynthesis of the crop?

  1. None, because the gas in ordinary air is already all a plant can use
  2. It rises, until some other requirement becomes the scarcestCorrect answer
  3. It falls, because too much of that gas is poisonous to a plant
  4. None, because a gas cannot affect how fast a reaction goes

Explanation

That gas is one of the two raw materials, so supplying more of it lets the reaction run faster whenever it was the scarce ingredient, which is exactly why growers pay to enrich the air. The claim that ordinary air already provides all a plant can use is what fails, because in bright warm conditions a crop can use far more than the air delivers.

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Question 31: A grower pipes extra carbon dioxide into a brightly lit,… · Plants and Photosynthesis · Questena