Question

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

• 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

The correct option is A The root dies first

If all the tissues except xylem of the main stem of a plant are removed in a ring, root dies first. The function of the phloem is to transport synthesized food from leaves to other parts of the plant stem (stem, roots, flowers, fruits, etc) and the xylem carries water and minerals obtained from soil to leaves through root and main stem. So, when the phloem of a plant are removed in a ring, food from the leaves will unable to proceed further into the root, however, the leaves will receive water and minerals through xylem tissue from the roots and the shoot will remain alive. But, due to the lack of food, the root will no longer be alive until the stored food gets consumed.

So, the correct answer is option A.