Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Dormancy and Seed germination

1. Dormancy is the
a) failure of a seed to germinate under favourable condition
b) failure of a seed to germinate under unfavourable condition
c) the ability of a seed to germinate under favourable condition
d) the ability of a seed to germinate under unfavourable condition
MCQ on Dormancy and Seed germination

2. Which of the following statement is true regarding dormancy?
a) Dormancy may be due to seed coats impermeability to CO2
b) Dormancy helps the seed to overcome unfavourable condition
c) Dormancy helps the seed to germinate during unfavourable condition
d) Dormancy may be due to soft fragile seed coat

3. Which of the following is a natural germination inhibitor that induces dormancy?
a) auxin
b) cytokinin
c) ABA
d) gibberellin

4. Some seeds enter dormancy when exposed to unfavourable condition for some time. Such dormancy is called  
a) immediate dormancy
b) primary dormancy
c) secondary dormancy
d) short term dormancy

5. Which of the following plant exhibit dormancy due to immature embryo?
a) Xanthium
b) Orchids
c) Hibiscus
d) Solanum

6. The process of weakening the seed coat to break dormancy is called
a) vernalization
b) scarification
c) photoperiodism
d) stratification

7. Photoblastic seeds are seeds
a) affected by light for germination
b) not affected by light for germination
c) independent of light for germination
d) affected by light and temperature for germination

8. Which is the pigment is involved in the germination of photoblastic seeds?
a) chlorophyll
b) carotenes
c) phytochromes
d) phaeophytin

9. Which of the following hormone is a dormancy inducer?
a) 2-4D
b) GA4
c) ABA
d) GA3
10. Which of the following is the structure in the seed coat that prevents water and O2 entry into seed thereby inducing dormancy?
a) strophiolar plug
b) pericarp
c) exocarp
d) epicarp
Answers:
1. b) failure of a seed to germinate under unfavourable condition
 2. b) Dormancy helps the seed to overcome unfavourable condition
3. c) ABA
4. c) secondary dormancy
5. b) Orchids
6. b) scarification
7.a) affected by light for germination
8. c) phytochromes
9. c) ABA
10. a) strophiolar plug

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