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Seed Dormancy and Germination (Class XI/XII)

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Number of Questions: 15
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Tags: dormancy germination Development in Plants
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What is the validity of the seeds of watermelon and tomato?

  1. 2 years

  2. 5 years

  3. 4 years

  4. Several years


Correct Option: C
Explanation:

The validity of the seeds of watermelon and tomato is 4 years.

Which of the following statements is correct?

  1. Lettuce germinates in dark and onion requires light for germination.

  2. Lettuce requires light for germination and onion germinates in dark.

  3. Lettuce and onion require light for germination.

  4. Lettuce and onion germinate in dark.


Correct Option: B
Explanation:

Lettuce requires light for germination and onion germinates in dark.

The reason for seed dormancy in xanthium is

  1. impermeability of seed coat to water

  2. impermeability of seed coat to oxygen

  3. presence of plant growth inhibitors

  4. rudiment embryo


Correct Option: B
Explanation:

Xanthium seeds are impermeable to oxygen as they have very hard seed coat.

Availability of food is a limiting factor in the germination of

  1. pea seeds

  2. mango seeds

  3. orchid seeds

  4. apple seeds


Correct Option: C
Explanation:

Availability of food is a limiting factor in the germination of orchid seeds.

What is the reason for dormancy in Gingko biloba?

  1. Hard seed coat

  2. Over ripening

  3. Presence of growth inhibitors

  4. Rudiment embryo


Correct Option: D
Explanation:

Rudiment embryo is present in Gingko.

Waxy coating on a bean seed makes it

  1. resistant to pathogens

  2. impermeable to water

  3. feasible for dispersion by animals

  4. capable of epigeal germination


Correct Option: B
Explanation:

Waxy coating on the surface of beans makes them impermeable to water.

Which of the following kinds of germination is seen in plants growing in O2 deficient soil?

  1. Epigeal

  2. Hypogeal

  3. Vivipary

  4. No germination takes place in O2 deficient condition.


Correct Option: C
Explanation:

Plants exhibiting vivipary grow in O2 deficient soils. 

Which of the following seeds requires prolonged period of storage for breaking seed dormancy?

  1. Mustard

  2. Apple

  3. Wheat

  4. Melli-lotus


Correct Option: B
Explanation:

Apple seeds require prolonged period of dry storage for breaking seed dormancy.

What does the process of leaching help in?

  1. Rapid development of embryo

  2. Softening of skin coat

  3. Diluting or removing growth inhibitor

  4. Inducing seed dormancy


Correct Option: C
Explanation:

Leaching dilutes or removes an inhibitor from the seed.

Which of the following is a natural seed inhibitor found in tomatoes?

  1. ABA

  2. Phenol

  3. Coumarin

  4. Cyanide


Correct Option: C
Explanation:

Coumarin is a natural seed inhibitor found in tomatoes.

Osmotic inhibitors ferulic acid and caffeic acid occur in

  1. mountain ash

  2. tomatoes

  3. sugar beet

  4. lemon


Correct Option: B
Explanation:

Ferulic acid and caffeic acid occur as osmotic inhibitors in tomatoes.

What is the mechanical removal of callus plugs in melli-lotus called?

  1. Mechanical scarification

  2. Stratification

  3. Impaction

  4. Chemical scarification


Correct Option: C
Explanation:

The removal of callus plugs which block the micropyle in melli-lotus is called impaction.

In which of the following plants do cotyledons act as green leaves after germination?

  1. Tamarind

  2. French bean

  3. Castor

  4. Mango


Correct Option: C
Explanation:

Cotyledons of castor act as green leaves after germination. They perform photosynthesis.

Why are the seeds of teak put into cow dung for a long period?

  1. To induce seed dormancy

  2. To break seed dormancy

  3. To manure the seeds

  4. As a pest control treatment


Correct Option: B
Explanation:

The seeds of teak are put into cow dung for a long period to break dormancy.

Which of the following processes marks the end of seed germination?

  1. Respiration

  2. Photosynthesis

  3. Reproduction

  4. Flowering


Correct Option: B
Explanation:

The start of photosynthesis marks the end of germination process.

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