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السؤال 73

Which description of transpiration in a leafy plant is correct?

  1. The movement of dissolved sugar out of a leaf
  2. Water being pumped out of the plant by the roots
  3. The loss of water vapour, mostly through the stomataالإجابة الصحيحة
  4. The uptake of water into a root hair from the soil

الشرح

Water evaporates inside a leaf and escapes as vapour through the stomata, the tiny pores set into the leaf surface, so what the plant loses is water and what it loses it to is the surrounding air. Describing sugar leaving the leaf names both the wrong substance and the wrong tissue, and roots have no mechanism that could push water out through a leaf.

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