Role of Abscisic Acid

Q.

Which hormone induces parthenocarpy in tomatoes?

Q.

Coconut milk (coconut water) is widely used in tissue culture because it contains

1. Gibberellins

2. Ethylene

3. Cytokinin

4. Auxins

Q.

Seeds of some plants are unable to germinate even when conditions are favourable. This is called

1. Dormancy

2. Quiescence

3. Non-viability

4. Vivipary

Q.

A plant hormone produced during adverse environmental condition is

1. Ethylene

2. Kinetin

3. Dichlorophenoxy acetic acid

4. Abscisic acid

Q. Match the following hormones with their functions.

Hormones	Function
1.Ethylene	i. Helps in cell division.
2.Gibberellin	ii. Induces dormancy in buds and seeds
3.Cytokinin	iii. Helps in the ripening of fruit
4.Abscisic acid	iv. Causes bolting in plants

1. 1-i, 2-iv, 3-iii, 4-ii
2. 1-ii, 2-iv, 3-i, 4-iii
3. 1-iv, 2-i, 3-iii, 4-ii
4. 1-iii, 2-iv, 3-i, 4-ii

Q. Which of the following effects is due to abscisic acid?

1. Induction of dormancy in buds or seeds
2. Inhibition of growth
3. Senescence
4. All of the above

Q.

Whichone of the plant growth regulators would you use if you are asked to:

(a)Induce rooting in a twig

(b)Quickly ripen a fruit

(c)Delay leaf senescence

(d)Induce growth in axillary buds

(e)‘Bolt’ a rosette plant

(f)Induce immediate stomatal closure in leaves.

Q.

Effect of auxins on plants is made use in commercial application of

1. All the above

2. Callus formation

3. Induction of root formation in stem cuttings

4. Induction of stem formation in stem cuttings

Q.

Why is Abscisic acid also known as stress hormone?

Q. Which of the following is an effect of abscisic acid on plants?

1. Inhibition of plant growth and metabolism
2. Opening of stomata
3. Induces seed germination
4. All the above

Q. Why is abscisic acid also known as stress hormone?