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السؤال 68

Which of these statements about phloem tissue is false?

  1. Its sieve tube cells are living cells
  2. Companion cells lie alongside the sieve tube cells
  3. It is made of dead, empty tubes with no living contentsالإجابة الصحيحة
  4. It is a living tissue, unlike the water-carrying vessels beside it

الشرح

Phloem keeps its cells alive: each conducting cell retains its contents and works together with a smaller neighbour, and that living machinery is what allows sugar to be loaded and unloaded along the route. Emptiness and death describe the water-carrying vessels instead, and swapping the two tissues on this point is the same slip as believing that sugar rises with the water.

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السؤال 68: Which of these statements about phloem tissue is false? · Plants and Photosynthesis · Questena