Given below are two statements : One is labelled as Assertion (A) and other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:
- A is true but R is false
- A is false but R is true
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
Answer
(3) Both A and R are true and R is the correct explanation of A
Solution
As per NCERT, the innermost wall layer of the microsporangium is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. ⇒ A is true.
The tapetum supplies food and other materials to the sporogenous tissue (microspore mother cells) and the developing microspores. More than one nucleus with dense cytoplasm increases the synthetic and metabolic activity of each tapetal cell, so nourishment becomes more efficient. ⇒ R is true.
∴ The tapetal cells are multinucleate because of their nutritive role; R is the correct explanation of A.
Answer: (3)