MCQs
Q1. Pollination does NOT guarantee fertilisation because:
A. Pollen grains are always sterile
B. Wrong type of pollen may land on stigma
C. Ovules are absent
D. Stigma is non-receptive
Q2. The pistil can recognise pollen due to:
A. Physical contact only
B. Chemical interactions
C. Colour differences
D. Size of pollen
Q3. Incompatible pollen is rejected by:
A. Destroying ovule
B. Preventing pollen germination or tube growth
C. Blocking stigma opening
D. Stopping fertilisation after zygote formation
Q4. Compatible pollen leads to:
A. Immediate fertilisation
B. Pollen tube formation and growth
C. Ovule degeneration
D. Seed formation directly
Q5. Pollen tube usually enters ovule through:
A. Chalaza
B. Funicle
C. Micropyle
D. Integument
Q6. The pollen tube enters into:
A. Egg cell directly
B. Central cell
C. Synergid via filiform apparatus
D. Antipodal cells
Q7. Filiform apparatus helps in:
A. Fertilisation
B. Pollen tube guidance
C. Ovule protection
D. Seed formation
Q8. In two-celled pollen, male gametes are formed:
A. Before pollination
B. Inside anther
C. During pollen tube growth
D. Inside ovule
Q9. In three-celled pollen, pollen tube carries:
A. One male gamete
B. No gametes
C. Two male gametes from beginning
D. Egg cell
Q10. Emasculation is done to:
A. Remove stigma
B. Prevent self-pollination
C. Enhance fertilisation
D. Increase pollen production
Q11. Bagging is done to:
A. Promote pollen germination
B. Protect stigma from unwanted pollen
C. Increase ovule number
D. Stop fertilisation
Q12. In unisexual flowers, emasculation is not needed because:
A. No stigma present
B. No anthers in female flower
C. No ovules present
D. Pollination is automatic
Assertion–Reason Questions
Options:
A. Both A and R are true, and R is the correct explanation
B. Both A and R are true, but R is NOT the correct explanation
C. A is true, R is false
D. A is false, R is true
Q13.
Assertion (A): Pollination does not always lead to fertilisation.
Reason (R): Stigma may receive incompatible pollen.
Q14.
Assertion (A): Pistil can distinguish between compatible and incompatible pollen.
Reason (R): Recognition is mediated by chemical interactions.
Q15.
Assertion (A): Incompatible pollen fails to fertilise ovule.
Reason (R): Its pollen tube growth is inhibited in the pistil.
Q16.
Assertion (A): Pollen tube enters the ovule through the micropyle.
Reason (R): Micropyle is the only opening in the ovule.
Q17.
Assertion (A): Pollen tube enters one of the synergids.
Reason (R): Filiform apparatus helps in guiding the pollen tube.
Q18.
Assertion (A): Generative cell divides to form two male gametes.
Reason (R): This division occurs during pollen tube growth in some plants.
Q19.
Assertion (A): Three-celled pollen grains already contain two male gametes.
Reason (R): Generative cell divides before pollen is shed.
Q20.
Assertion (A): Pollen-pistil interaction is a dynamic process.
Reason (R): It involves recognition, acceptance or rejection of pollen.