A) Deposition of callose on sieve plates
B) Providing energy for active translocation
C) Autolvtic enzymes
D) Sealing mechanism on wounding
Correct Answer: D
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.
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