Question

Which of these options is true in the context of the below diagram of pollen grain?

 

• A. 'A' is a generative cell which gives rise to pollen tube and 'B' is a vegetative cell which forms male gametes
• B. 'A' is a vegetative cell with abundant food reserve and 'B' is a generative cell which forms male gametes
• C. 'A' is a generative cell which forms male gametes and 'B' is a vegetative cell which produces pollen tube
• D. 'A' is a vegetative cell which gives rise to male gametes and 'B' is a generative cell which produces pollen tube

Hint:

The vegetative cell in pollen forms the pollen tube, while the generative cell produces sperm.

Answer 1

The Correct Option is B

• Pollen Grain Structure: A pollen grain contains a vegetative cell and a generative cell. The vegetative cell forms the pollen tube, while the generative cell divides to produce male gametes.
• Diagram Interpretation: In the diagram, 'A' is depicted as the larger cell with abundant cytoplasm (suggesting food reserve), typically the vegetative cell. 'B' is the smaller cell, likely the generative cell that produces gametes.
• Option Analysis:
  • (1) 'A' is a generative cell which gives rise to pollen tube and 'B' is a vegetative cell which forms male gametes: Incorrect, generative cells produce gametes, not the pollen tube.
  • (2) 'A' is a vegetative cell with abundant food reserve and 'B' is a generative cell which forms male gametes: Correct, aligns with the roles of vegetative and generative cells.
  • (3) 'A' is a generative cell which forms male gametes and 'B' is a vegetative cell which produces pollen tube: Incorrect, reverses the functions.
  • (4) 'A' is a vegetative cell which gives rise to male gametes and 'B' is a generative cell which produces pollen tube: Incorrect, vegetative cells form the pollen tube, not gametes.
• Conclusion: The correct answer is (2), as 'A' is the vegetative cell (with food reserve) and 'B' is the generative cell (forming male gametes).