A) sieve elements
B) vessel elements
C) trichomes
D) guard cells
Correct Answer: A
Solution :
| [a] Companion cells are characteristic elements of phloem tissue associated with the sieve tubes (sieve elements) in the angiosperms. |
| The siever tubes and companion cells are related ontogenically as they develop from the same mother cell. The companion cells and sieve tubes maintain close cytoplasmic connections through plasmodesmata. |
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