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Sieve Elements (Sieve Cells and Sieve Tu...

Sieve Elements (Sieve Cells and Sieve Tubes)

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Sieve tubes have

Sieve tubes and companion cells are sister cells and (a) Companion cells maintain the osmotic balance in sieve elements (b)Both cells are derived from same mother cells (c )Sieves are associated with companion cells in all seed beasing plants (d) Companion cells present in Pinus only

Xylem tissue is made of sieve tubes.

Assertion :- Sieve tube element and companion cell are called sister cells. Reason :- Sieve tube element and companion cells arise from same mother cells.

Differentiated between vessel and sieve tube.

Spermatophytes in which phloem have albuminous cells and sieve cells

A common structural feature of vessel elements and sieve tube elements is