Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Photochemical receptors in the leaves are the proteinaceous pigments located in the stroma of the chloroplast.
Reason (R): These proteinaceous pigments are called Phytochromes.
In light of the above statements, choose the correct answer from the options given below.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

Phytochromes are the proteinaceous pigments, but they are not located in the stroma of the chloroplast.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
The photoreceptor that senses the photoperiod in leaves is the pigment phytochrome, a chromoprotein.

Step 2: Assertion (A)
The pigment is not in the stroma of the chloroplast, so (A) is false.

Step 3: Reason (R)
These proteinaceous light receptor pigments are called phytochromes, so (R) is true.

Final Answer:
(A) is false but (R) is true. \[ \boxed{\text{(D) }\text{(A) is false but (R) is true.}} \]