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: Recall nutrient mobility in plants.
- Some nutrients are mobile in plants, meaning they can move both upwards (acropetal) and downwards (basipetal). - Some nutrients are immobile and move only acropetally through xylem.

Step 2: Behavior of Calcium.
- Calcium is absorbed from the soil and transported only upward (acropetal movement) in the xylem. - It is not retranslocated from older to younger tissues, making it immobile in phloem. - Hence, deficiency symptoms appear first in young tissues.

Step 3: Eliminate other options.
- Nitrogen: Mobile, moves through xylem and phloem.
- Sulphur: Semi-mobile, but not strictly acropetal.
- Potassium: Highly mobile nutrient.

Step 4: Conclusion.
The nutrient with acropetal-only movement in xylem is Calcium.

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