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The sieve tubes and companion cells are ...

The sieve tubes and companion cells are exceptional features of

A

Gymnosperms

B

Angiosperms

C

Ferns

D

Pteridophytes

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The correct Answer is:
B
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A: Sieve tubes and companion cells are related ontogenetically. R: Both develop from same mother cell.

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

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

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  7. In which of the following, gametes are produced by mitrotic division?

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