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NEET2011BotanyAnatomy of Flowering PlantsActual

In the sieve elements, which one of the following is the most likely function of P-proteins?

Options

  1. ADeposition of callose on sieve plates
  2. BProviding energy for active translocation
  3. CAutolytic enzymes
  4. DSealing off mechanism on wounding

Correct answer

D. Sealing off mechanism on wounding

Step-by-step solution

In most angiospermic plants, sieve tube elements of phloem, are P-proteins. Later is found in all dictos and in many monocots but it is absent in gymnosperms and cryptogams. The main function of P -proteins is in sealing off damaged sieve elements by plugging up sieve plate pores.

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