Question

Assertion (A): The deficiency symptoms of N, P and Mg are visible first in senescent leaves.
Reason (R): Elements like N, P and Mg are mobile.

• A. Both A and R are true and R explains A
• B. Both A and R are true and R does not explain A
• C. A is true and R is false
• D. Both A and R are false

Answer 1

The correct option is A

Both A and R are true and R explains A

Elements like N, P and Mg are actively mobilised to young developing tissues from older tissues under deficiency. Hence deficiency symptoms appear first in old senescing leaves.