Question 8

The following two questions consist of two statements – Assertion (A) and Reason (R).
Answer these questions by selecting the appropriate option given below:
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, and R is not the correct explanation of A.
(C) A is true but R is false.
(D) A is false but R is true.

Assertion (A): Tallness of a pea plant is controlled by an enzyme.
Reason (R): The gene for that enzyme makes proteins which help the plant to be tall.

 

Answer:

(A) Both A and R are true, and R is the correct explanation of A.

Assertion (A): Tallness of a pea plant is controlled by an enzyme.

• ✅ True. In pea plants, the “T” gene codes for an enzyme that helps in the synthesis of growth hormone gibberellin, which promotes stem elongation.

Reason (R): The gene for that enzyme makes proteins which help the plant to be tall.

• ✅ True. Genes code for proteins (enzymes). The enzyme promotes gibberellin synthesis, leading to tallness.