A) Deposition of calluses on sieve plates
B) Providing energy for active translocation
C) Autolytic enzymes
D) Sealing mechanism on wounding
Correct Answer: D
Solution :
Sieve elements are a component of phloem tissue and are responsible for conduction of food in plants. A sieve tube element has peripheral layer of cytoplasm without any nucleus. The central part is occupied by a network of canals which contain fibrils of P-protein. The protein is vibratite and is believed to actively participate in the transport of nutrients. One general property of it is its ability to form a gel and it functions as a puncture repair substance forming a plug at any site of damage in sieve element, thus preventing loss of food materials being translocated by the phloem. Thus it is believed to have sealing function on wounding.
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