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Question 72

A plant takes up nitrate ions at its roots and they arrive in a leaf at the top of the stem. Which statements about that journey are true? Select all that apply.

  1. Carrying these ions means that xylem is carrying the plant's food
  2. The ions are dissolved in the water that is moving upwardsCorrect answer
  3. The ions travel as dry particles blown along inside the tubes
  4. The ions travel in the xylemCorrect answer
  5. The ions are handed across to the phloem at the base of the stem

Explanation

Mineral ions dissolve in the water a root absorbs and are swept along with it in the water-carrying tissue, so they reach the leaf by exactly the same route as the water itself. Carrying dissolved minerals is not the same as carrying food: food here means the sugar a plant builds, and that is loaded into the other tissue only after a leaf has made it.

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Question 72: A plant takes up nitrate ions at its roots and they arrive… · Plants and Photosynthesis · Questena