Question

why the cells of bark thick walled ? what are the constiutents of phloem?

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Answer 1

Explanation:

mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin . the cells are rigid nonstrecthable and are usually found in non growing regions of plant bodies ,such as the bark or mature stem .

constituents of phloem.

•sieve elements

•companion cells

•Fibres

•parenchyma.

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