Sieve plates of phloem are

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(D) The sieve plates are the perforated end walls of sieve tube elements in the phloem. During the maturation of a sieve tube element,the transverse e

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Sufficiently porous

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(D) The sieve plates are the perforated end walls of sieve tube elements in the phloem. During the maturation of a sieve tube element,the transverse end walls develop numerous small pores,making them sufficiently porous to allow the translocation of food materials (sucrose) from one sieve tube element to the next. Therefore,the correct description is that they are sufficiently porous.

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