Characteristics of Auxin

Q.

Write the full form of IBA, NAA, and 2-4 D.

Q.

Which plant hormone breaks seed dormancy?

Q.

Which of the following hormone is responsible for apical dominance in plants?

1. Abscisic acid (ABA)

2. Gibberellic acid

3. Indole-3-acetic acid (IAA)

4. All Of These

Q. In tissue culture, the term callus refers to

1. decaying cells
2. differentiated mass of cells
3. non-dividing mass of cells
4. undifferentiated mass of cells

Q.

What do you mean by natural auxin?

Q.

What are the traits of cells present in the phase of elongation?

Q.

Which hormone is known as the stress hormone and why?

Q.

Name the plant hormone responsible for elongation of cells?

Q.

What are the roles of plant hormones?

Q. Auxin is synthesized from the amino acid .

1. lysine
2. tryptophan
3. glycine
4. valine

Q.

Which hormones can uncouple oxidative phosphorylation in high concentration?

Q. Identify the synthetic auxin from the options given below.

1. Naphthalene acetic acid
2. Indole-3-acetic acid
3. Indole-3-butyric acid
4. 4-chloroindole-3-acetic acid

Q.

What are plant hormones? Write about two functions of Auxins.

Q. Removal of apical bud during pruning results in the

1. formation of a new apical bud
2. promotion of lateral branching
3. early flowering
4. death of the plant

Q. Increased vacuolation, cell enlargement and new cell wall deposition are the characteristics of cells in phase of growth.

1. Meristematic
2. Elongation
3. Maturation
4. Differentiation

Q. Which ion accumulates in the guard cells at the time of opening of stomata?

1. Ca
2. P
3. K
4. Mg

Q.

Decapitation results in:

1. Growth of lateral buds

2. Growth of apical bud

3. Increase in height of plant

4. Growth of terminal bud

Q. Explain the physiological roles of Auxins

Q. Which hormone is responsible for phototropisms?

1. Ethylene gas
2. Abscisic acid
3. Auxin
4. Gibberellins
5. Cytokinins

Q. Which one is not a physiological effect of auxin?

1. Promotes bolting
2. Prevents early fruit and leaf drop
3. Promotes flowering
4. Initiates rooting in stem cuttings
5. Inhibits growth of lateral buds

Q.

Is cytokinin a plant hormone?

Q. Name two synthetic auxins. Give four functions of auxins.

Q. How auxins are applied in agriculture/horticulture?

Q. Synthetic auxins are used for

1. Increasing the size of the fruits
2. Stimulating growth of cells in tissue culture
3. Ripening fruits
4. Killing weeds

Q.

The most common pesticides used in the crops are

1. BHC, aldrin, malathion, pyrethrin

2. aldrin, malathion, lead arsenate, sodium fluoride

3. aldrin, malathion, sodium arsenate, lead arsenate

4. cryolite, aldrin, pyrethrin
   

Q. Hormone involved in phototropism is

1. IAA
2. Gibberellin
3. Kinetin
4. 2, 4-D

Q.

What are the five plant hormones?

Q. Apical dominance in plants is caused by

1. Ethylene gas
2. Abscisic acid
3. Auxin
4. Gibberellins
5. Cytokinins

Q. Describe the roles of auxin in plants.

Q. Which hormone promotes growth of tendril around a support?