Role of Abscisic Acid

Q. Seeds can become dormant because of

1. impermeable or hard seed coat
2. all the above
3. chemical inhibitors
4. immature embryos

Q.

Which one of the following growth regulators is known as stress hormone?

1. Ethylene

2. $G{A}_3$

3. Indole acetic acid

4. Abscisic acid

Q. Which of the following is/are plant growth inhibitor(s)?

1. Auxin
2. Abscisic acid
3. Cytokinin
4. Ethylene

Q. Which of the following is/are causes of seed dormancy?

1. Impermeable and hard seed coat
2. Presence of chemical inhibitors like phenolic acid.
3. All of the above
4. Immature embryos

Q. Which of the following is not a function of abscisic acid?

1. It helps the seeds to survive under extreme unfavourable conditions
2. It induces elongation of stem
3. It induces the closure of stomata
4. It helps in the storage of seed for agricultural purpose.

Q. Which of the following options is/are correct with respect to abscisic acid?

1. It hastens the maturity period in juvenile conifers
2. It enables the plant to withstand stressful conditions
3. It controls xylem differentiation
4. All the above

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 chemicals can be applied to the seed to induce dormancy?

1. Abscisic acids
2. Gibberellic acids
3. Cytokinin
4. Kinetin

Q. Which of the following hormone is a plant growth inhibitor?

1. Auxin
2. Gibberellin
3. Abscisic acid
4. Cytokinin

Q.

Gibberellins can facilitate seed germination because they can influence the

1. synthesis of abscisic acid

2. production of hydrolyzing enzymes

3. absorption of water through the hard seed coat

4. rate of cell division