Question

If all the tissues, except xylem of main stem of a plant, are removed in a ring

• A. The root dies first
• B. The shoot dies first
• C. The root and shoot will die at the same time
• D. Neither the root nor the shoot will die

Answer 1

Answer: (A)

The root dies first

• The function of phloem is to transport synthesized food from leaves to other parts of the plant and xylem carries water and minerals obtained from soil to leaves through the root and main stem.
• So, when the phloem of a plant is removed from the ring, food from the leaves will unable to proceed further into the root.
• -However, the leaves will receive water and minerals through xylem vessels from roots. So, shoots will remain alive.
• But, due to the lack of food, the root will no longer alive until the stored food consumes.

Therefore, the correct answer is option A.