Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: In gymnosperms the pollen grains are released from the microsporangium and carried by air currents. Reason R: Air currents carry the pollen grains to the mouth of the archegonia where the gametes are discharged and pollen tube is not formed. In the light of the above statements, choose the correct answer from the options given below:
Answer: (C) A is true but R is NOT true.. Answer: (C) A is true but R is NOT true.
- 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 NOT true.✓
- D.A is NOT true but R is true.
Correct Answer
(C) A is true but R is NOT true.
Solution & Explanation
Answer: (C) A is true but R is NOT true. Solution: Assertion A is correct — in gymnosperms the pollen grains are released from the microsporangium and carried by air currents. Reason R is false because, contrary to its claim, a pollen tube IS formed in gymnosperms: the pollen tube carries the male gametes towards the archegonia and discharges them near the mouth of the archegonia. Hence A is true but R is not true, making (C) correct. NCERT Reference: Class XI Biology, Plant Kingdom, p.33, lines 35-41 — "The pollen grain is released from the microsporangium. They are carried in air currents ... The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia".