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

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

AIIMSAIIMS 2006

Solution:

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