MCQs
1. Which type of pollination is genetically equivalent to self-pollination but functionally cross-pollination?
A. Autogamy
B. Geitonogamy
C. Xenogamy
D. Hydrophily
2. Complete autogamy requires:
A. Pollinating agents
B. Large petals
C. Synchrony of pollen release and stigma receptivity
D. Nectar secretion
3. Which of the following ensures 100% autogamy?
A. Chasmogamous flowers
B. Wind pollination
C. Cleistogamous flowers
D. Bird pollination
4. Cleistogamous flowers are always:
A. Cross-pollinated
B. Wind-pollinated
C. Self-pollinated
D. Water-pollinated
5. Which of the following is NOT an advantage of cleistogamy?
A. Assured seed set
B. Genetic variation
C. Less pollen wastage
D. Pollination without pollinators
6. Which of the following plants produces both chasmogamous and cleistogamous flowers?
A. Viola
B. Wheat
C. Maize
D. Mango
7. Dehiscence refers to:
A. Formation of pollen grains
B. Fusion of gametes
C. Opening of anther to release pollen
D. Germination of pollen grain
8. Which type of pollination brings genetically different pollen to stigma?
A. Autogamy
B. Geitonogamy
C. Xenogamy
D. Cleistogamy
9. Assertion (A): Geitonogamy requires a pollinating agent.
Reason (R): It involves transfer of pollen between flowers of the same plant.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, R is false
D. A is false, R is true
10. Which condition is essential for autogamy in open flowers?
A. Bright petals
B. Presence of nectar
C. Close proximity of anther and stigma
D. Presence of pollinators
11. Which of the following statements is incorrect?
A. Xenogamy introduces genetic variation
B. Geitonogamy is genetically similar to autogamy
C. Cleistogamy promotes cross-pollination
D. Autogamy does not require pollinating agents
12. In cleistogamous flowers, pollination occurs:
A. Before flower opens
B. After fertilisation
C. Only by insects
D. Only by wind
13. Which of the following combinations is correct?
A. Autogamy – Different plant
B. Geitonogamy – Same plant, different flower
C. Xenogamy – Same flower
D. Cleistogamy – Cross-pollination
14. Main disadvantage of continuous autogamy is:
A. Increased variation
B. Hybrid vigour
C. Inbreeding depression
D. High adaptability
15. Which type of pollination is evolutionarily most significant?
A. Autogamy
B. Cleistogamy
C. Geitonogamy
D. Xenogamy
Answer: D
Assertion Reason Questions
Directions:
A. Both Assertion (A) and Reason (R) are true and R explains A
B. Both A and R are true but R does NOT explain A
C. A is true, R is false
D. A is false, R is true
16.
Assertion (A): Autogamy is rare in open flowers.
Reason (R): It requires synchrony of pollen release and stigma receptivity.
17.
Assertion (A): Cleistogamous flowers are always self-pollinated.
Reason (R): They never open, preventing cross-pollination.
18.
Assertion (A): Geitonogamy is genetically similar to xenogamy.
Reason (R): It involves transfer of pollen between different flowers.
19.
Assertion (A): Xenogamy introduces genetic variation.
Reason (R): It involves transfer of pollen between different plants.
20.
Assertion (A): Cleistogamy ensures seed set even without pollinators.
Reason (R): Pollination occurs within closed flowers.
21.
Assertion (A): Geitonogamy requires a pollinating agent.
Reason (R): Pollen is transferred between flowers of the same plant.
22.
Assertion (A): Autogamy promotes genetic variation.
Reason (R): It involves fusion of gametes from the same flower.
23.
Assertion (A): Cleistogamous flowers are disadvantageous in changing environments.
Reason (R): They lack genetic variation.
24.
Assertion (A): Dehiscence is necessary for pollination.
Reason (R): It releases pollen grains from anther.
25.
Assertion (A): Chasmogamous flowers can undergo autogamy.
Reason (R): Their anthers and stigma are exposed.
26.
Assertion (A): Xenogamy is evolutionarily more advantageous than autogamy.
Reason (R): It increases genetic diversity.
27.
Assertion (A): Cleistogamous flowers produce more pollen than chasmogamous flowers.
Reason (R): They depend entirely on self-pollination.
28.
Assertion (A): Geitonogamy can be considered functionally cross-pollination.
Reason (R): It requires an external pollinating agent.
29.
Assertion (A): Autogamy does not require any external agent.
Reason (R): Pollen is transferred within the same flower.
30.
Assertion (A): Continuous self-pollination may lead to inbreeding depression.
Reason (R): It reduces genetic variation.