Question

Q9. Give the reason why
(a) Sieve plates are named so?

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Answer 1

Answer:

Explanation:

Sieve plates: a perforated wall or part of a wall at the end of one of the individual cells making up a sieve tube.

These thin plates, which separate neighboring phloem cells, are perforated by a large number of tiny sieve pores and are believed to play a crucial role in protecting the phloem sap from intruding animals by blocking flow when the phloem cell is damaged.

Sieve cells are also associated with gymnosperms because they lack thecompanion cell and sieve member complexes that angiosperms have. ... Their narrow pores are necessary in their function in most seedless vascular plants and gymnosperms which lack sieve-tube members and only have sieve cells to transport molecules.

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