Question

Which of the following element is called as a key of life?
1. Nitrogen
2. Potassium
3. Boron
4. Phosphorus

Answer 1

Correct Answer - Option 4 : Phosphorus

The correct answer is Phosphorus.

• Phosphorus deficiency:

1. Premature leaf fall.
2. Retarded overall growth.
3. Occasional purpling of leaves and stems, spindy growth.
4. Overall stunted appearance, mature leaves leaves have characteristics dark to blue green coloration, restricted root develpoment.
5. Due to deficiency of single element (phosphorus) the life cycle of plant can not be completed, hence P is called key of life.