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(A) In phloem,sieve tubes possess perforated oblique or transverse sieve plates.Sieve plates are classified as simple when they consist of a single re

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Cucurbita

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(A) In phloem,sieve tubes possess perforated oblique or transverse sieve plates.Sieve plates are classified as simple when they consist of a single region of pores (e.g.,$Cucurbita$,$Nicotiana$).They are classified as compound when they consist of several pored regions separated by bars or wall thickenings (e.g.,$Vitis$).

Simple sieve plate with single perforation is present in

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