Seed Dormancy

Q. Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:

1. Gibberellic acid
2. Nitrate
3. Ascorbic acid
4. Chilling conditions

Q. Caruncle is found in

1. castor
2. litchi
3. black pepper
4. calotropis

Q. Development of fruit without fertilization is called

1. Cell culture
   
2. Cell division
3. Parthenocarpy
4. Parthenogenesis

Q.

What will happen if all seeds of a plant were to fall at the same place and grow there?

Q. The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded is called

1. vernalization
2. imbibition
3. scarification
4. denudation

Q. Which of the following options is not a reason for the dormancy of seeds?

1. Impermeable or hard seed coat
2. Chemical inhibitors
3. Immature embryos
4. Vivipary

Q. Which of the following promotes seed germination and inhibits dormancy?

1. ABA
2. Phenolic acid
3. Para-ascorbic acid
4. Gibberellic acid

Q. All of the following cause seed dormancy, except:

1. Phenols
2. Gibberellins
3. Impermeable seed coat
4. ABA

Q.

Assertion(A): ABA helps seed to withstand desiccation and other factors unfavorable for growth.

Reason(R): ABA induces seed dormancy.

1. Both A & R are true and R does not explain A

2. Both A & R are false

3. A is true and R is false

4. Both A & R are true and R explains A

Q.

The inactivity of embryo in mature seed is called __.

Q. The seeds of squirting cucumber plant are dispersed by

1. bursting of fruits due to pressure.
2. birds.
3. water.
4. air.

Q.

Is a seed dead or alive?

Q.

Seeds of some plants germinate immediately after shedding from the plants while in other plants they require a period of rest before germination. The later phenomena is called as dormancy. Give the reasons for seed dormancy and some methods to break it.

Q.

An inactive period when the embryo puts its development on hold is termed as

1. Seed storage

2. None of the above

3. Seed germination

4. Seed dormancy

Q. what is the role of that hormone in seed development???

Q. Germination in seeds can’t be induced by

1. passage of seeds through animal's digestive system
2. subjecting the seeds to hot or cold conditions
3. by scarification methods
4. by application of ABA

Q. Which of the following promotes seed germination?

1. Abscisic acid
2. Phenolic acid
3. Gibberellic acid
4. Para-ascorbic acid

Q. Seed dormancy is primarily governed by:

1. IAA
2. GA
3. ABA
4. Cytokinin

Q. The cause of dormancy for sometime in fertilized ovule is

1. Presence of Auxin hormone
2. Presence of growth inhibitor ABA
3. Presence of least amount of water
4. Zygote divides only after certain amount of endosperm is formed

Q.

Type of seed dormancy is

1. Morphological
2. Physiological
3. Mechanical
4. All of the above

Q. Define the terms Quiescence and Dormancy.

Q.

Which compound can induce seed dormancy?

1. Gibberellins
2. ABA
3. Ethylene
4. Potassium nitrate

Q. What is dormancy of seed? Name an enzyme which dormancy?

Q.

Dormant seeds are

1. Succulent
2. Dry
3. Wet
4. Soft

Q. Seeds of some plants do not germinate even under favourable conditions due to

1. Dormancy
2. Quiescence
3. Vivipary
4. Non-viability

Q. Write a short note on seed dormancy.

Q. Seed dormancy may be due to

1. Permeable seed coat
2. Lack of reserve food
3. Thin seed coat
4. Hard impermeable seed coat

Q. State the types of exogenous and endogenous dormancy.

Q. Which of the following breaks the dormancy of seeds?

1. IAA
2. GA${}_3$
3. Auxin
4. All of the above

Q. Deeply sown seeds do not germinate and do not come up over due to the deficiency of ...................

1. Nutrients
2. Water
3. Oxygen
4. Both B and C