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

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

(a) Deposition of callose on sieve plates 

(b) Providing energy for active translocation

(c) Autolytic enzymes 

(d) Sealing mechanism on wounding

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2 Answers

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Option : d

Sealing off mechanism on wounding
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The correct option is (d).

Explanation:

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 late pores.

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