Question

In the given figure of phloem tissue, identify the marked part ($A,B$ and $C$) which help in maintaining the pressure gradient in the sieve tubes.

• A. A
• B. B
• C. C
• D. None of the above

Answer 1

Answer: (C)

In the given fig. of phloem tissue $A,B$ & $C$ are respectively sieve tube, phloem parenchyma and campanion cells. Companion cells (c) are specialized parenchymal cells adjacent to a sieve tube in the phloem of flowering plants. It is beliveved to regulate the flow of nutrients through the tube.