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السؤال 44

Which statements about the veins running through a leaf are true? Select all that apply.

  1. They bring ready-made food up from the roots to the leaf
  2. They contain xylem, which brings water into the leafالإجابة الصحيحة
  3. They carry water back down out of the leaf and into the soil
  4. They contain phloem, which carries sugars out of the leafالإجابة الصحيحة

الشرح

A vein carries two kinds of transport tissue: one delivers the water that the roots took up, and the other takes away the sugars the leaf has made. Treating a vein as a supply line of food into the leaf gets the direction wrong, because a lit leaf is where sugar is produced, and water is delivered to a leaf rather than drained back out of it.

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السؤال 44: Which statements about the veins running through a leaf are… · Plants and Photosynthesis · Questena