A) sieve tubes
B) xylem
C) collenchyma
D) cambium
Correct Answer: A
Solution :
Companion cells are characteristic elements of phloem tissue associated with the sieve tubes the angiosperms. The sieve tubes and companion cells are related ontogenetically as they develop from the same mother cell. The companion cells and sieve tubes maintain close cytoplasmic connections with plasmodesmata.
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