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Question 54

By what route and by what process do gases enter and leave a leaf?

  1. Through the roots, pumped up the stem by the plant
  2. Through the stomata, by diffusionCorrect answer
  3. Through the stomata, pumped in and out by the guard cells
  4. Through the waxy cuticle, by diffusion

Explanation

Gases pass in and out through the small pores of the leaf surface, and they move simply because they are more concentrated on one side of the surface than the other, which costs the plant no energy at all. A plant has nothing that pumps gases about, and the waterproof covering of a leaf is not a route for them.

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Question 54: By what route and by what process do gases enter and leave… · Plants and Photosynthesis · Questena