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السؤال 38

A diagram of leaf structure shows nearly all the stomata drawn on the upper surface of a broad leaf. What correction does that diagram need?

  1. Most of them should be spread evenly over both surfaces
  2. Most of them should be moved to the underside of the leafالإجابة الصحيحة
  3. They should be removed, as a leaf surface has no pores at all
  4. They should be redrawn along the edge of the leaf blade only

الشرح

Counting stomata under a microscope shows far more of them on the shaded underside of a typical broad leaf than on its sunlit top. Drawing them on top comes from assuming the pores must face the light, yet light does not enter a leaf through them at all, and a leaf surface certainly has pores somewhere, or no gas could reach the cells inside.

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السؤال 38: A diagram of leaf structure shows nearly all the stomata… · Plants and Photosynthesis · Questena