Question

Death of protoplasm is a pre-requisite for a vital function like

• A. transport of sap
• B. transport of food
• C. absorption of water
• D. gaseous exchange.

Answer 1

The Correct Option is A

The question is about identifying a vital function in plants that requires the death of protoplasm. Let's evaluate each option:

1. Transport of Sap: In plants, the transport of sap predominantly occurs through xylem vessels. Xylem vessels are specialized structures formed from the stacking of dead cells called vessel elements. The death of the protoplasm results in a hollow tube, facilitating efficient water transport and minerals from roots to different parts of the plant. Therefore, the death of protoplasm is necessary for the formation of functional xylem vessels.
2. Transport of Food: The transport of food in plants happens through phloem tissue, which is composed of living cells like sieve tube elements and companion cells. Therefore, this process does not require the death of protoplasm.
3. Absorption of Water: The absorption of water occurs through root hairs, which are living cells. Thus, the death of protoplasm is not necessary for this process.
4. Gaseous Exchange: In plants, gaseous exchange takes place through stomata, which are regulated by guard cells that are alive. This process does not depend on the death of protoplasm.

Based on this evaluation, the correct answer is Transport of Sap (Option 1), as the process requires the presence of dead xylem cells for effective sap conduction.