Role of Abscisic Acid

Q.

For tea plantations, and hedge-making, which of the following plant growth hormones is used ?

1. Zeatin

2. Indole-3 acetic acid

3. Abscisic acid

4. Ethylene

Q. Fruit and leaf drop at early stages can be prevented by the application of:

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

Q.

What are the physiological effects of ethylene-plant hormone?

Q.

What is the method of breaking seed dormancy?

Q.

Why is Abscisic acid also known as stress hormone?

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 is/are plant growth inhibitor(s)?

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

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 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.

How do plant hormones affect plant growth and development?

Q. The PGRs can be broadly divided into two groups based on their functions in living plant body. One group of PGRs are involved in growth promoting activities, such as cell division, cell enlargement, pattern formation, tropic growth, flowering, fruiting and seed formation. These are also called

Q.

Pea is an endospermic seed.

1. True
2. False

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

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

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

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

Q. Which one of the following generally act as an antagonist to gibberellins?

1. Zeatin
2. Ethylene
3. ABA
4. IAA

Q. Which one of the following is known as the stress hormone?

1. Abscisic acid
2. Ethylene
3. Gibberellins
4. All of the above

Q.

Which plant hormone helps to break seed dormancy?

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.

What is the main function of abscisic acid?

Q. Which of the following is not a method of breaking dormancy of seeds?
Method 1:Hydraulic pressure can be applied on seeds for 5-20 minutes which can weaken the seed coat
Method 2: use of inhibitors can help in breaking dormancy of seeds.
Method 3:Rupturing the seed coat by filing or chipping through machineries helps in breaking dormancy of seeds.

1. Method 1 and 3
2. Only method 2
3. Only method 3
4. Method 1, 2 and 3

Q.

Which of the following is an anti-transpirant?

1. Auxin

2. Gibberellin

3. Abscisic acid

4. Cytokinin

Q.

How does ethylene affect plant growth?

Q.

Why is Abscisic acid also known as stress hormone?

Q. How many of the following statements is/are correct?
I.Soil microbes weakens the seed coat and promotes germination
II.Scarification is the process of breaking seed coat
III.Rainwater leaches off chemical inhibitors from the seed
IV. Chilling the seed will promote seed germination

1. Only statements I and II are correct
2. Only statements II and IV are correct
3. All statements are true
4. Only statement IV is correct

Q. Which of the following hormones and their respective functions are incorrectly matched?

1. Auxins --> Helps in growth of root and shoot apex.
2. Gibberellins --> Helps in improving the shape of fruits
3. Ethylene --> Promotes rapid internode elongation in deep water rice plants.
4. Abscisic acid --> delays leaf senescence

Q.

Name the plant hormone which is called the stress hormone.

Q.

Does abscisic acid prevent wilting of leaves?

Q. Seeds can become dormant because of

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

Q. Identify the plant growth regulator, which is not a growth-promoting hormone from the options given below.

1. Auxins
2. Cytokinins
3. Ethylene
4. Gibberellins

Q. Select the correct statements:
i. A seed may fail to germinate due to impermeable and hard seed coat.
ii. Carrot is an annual plant.
iii. The site of perception of light in plants is shoot apices.

1. Only i is correct
2. Both i and iii are correct
3. Only ii is correct
4. Both ii and iii are correct