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Phloem fibres :

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From their time of origin lack protoplasm

Are living at maturity

Are generally absent in the primary phloem but are found in the secondary phloem

Are much elongated, branched and have needle like apices

answer is A.

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Detailed Solution

The phloem fibres are composed of sclerenchymatous tissues. These are mainly absent in the primary phloem and present in the secondary phloem.

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