A) Collenchyma
B) Parenchyma
C) Xylem
D) Sieve tube
Correct Answer: D
Solution :
A sieve tube is analogous to RBC, both being living but enucleated at maturity. A network of fibres of P1 and P2 protein is present in the central part of lumen of sieve tube which controls movement of materials and with callose, the sealing of pores after injury.
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