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