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Question 94

Two identical seedlings are grown in good light with plenty of water; one receives nitrate and the other receives none. The one without nitrate stays small. Why?

  1. It is starving, because the soil holds no food for it
  2. It cannot photosynthesise without nitrate
  3. It cannot make enough protein to build new tissueCorrect answer
  4. Its roots cannot take up water without nitrate

Explanation

Growth means building new cells, and new cells need protein, so a plant short of the mineral used to make protein has no way to add tissue even while energy is plentiful. Calling such a plant starving misreads the problem, because with light and water present it is making sugar perfectly well and what it lacks is a building material rather than a fuel.

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Question 94: Two identical seedlings are grown in good light with plenty… · Plants and Photosynthesis · Questena