Question

The nutrient moves up only in acropetal direction through xylem found in the plant system for:

• A. Nitrogen
• B. Calcium
• C. Sulphur
• D. Potassium

Hint:

Calcium is immobile in plants; deficiency causes stunted growth, necrosis at tips, and blossom-end rot in tomatoes.

Answer 1

The Correct Option is B

Step 1: Nutrient Mobility in Plants.
- Nutrients can be mobile (moving acropetally and basipetally) or immobile (moving only acropetally via xylem).

Step 2: Calcium's Movement.
- Calcium is absorbed and transported solely upwards (acropetal) in the xylem. - It does not move from older to younger tissues via phloem, indicating its immobility in phloem. - Consequently, calcium deficiency is first observed in young plant tissues.

Step 3: Evaluation of Other Nutrients.
- Nitrogen: Mobile, translocates in both xylem and phloem.
- Sulphur: Partially mobile, but not strictly acropetal.
- Potassium: Highly mobile nutrient.

Step 4: Determination.
Calcium is the nutrient exhibiting acropetal-only movement in the xylem.

Final Answer: \[\boxed{\text{Calcium moves only acropetally in plants.}}\]