A) sieve tubes and bast fibres
B) trachea and phloem fibres
C) xylem parenchyma and xylem fibres
D) sieve tubes and companion cells.
Correct Answer: D
Solution :
: Companion cells are narrow, elongated and thin walled living cells on the sides of sieve tubes and are closely associated with them through compound plasmodesmata which assists in translocation of solutes.
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