Abscisic Acid

Q.

One of the commonly used plant growth hormones in tea plantations is?

1. Zeatin

2. Abscisic acid

3. Ethylene

4. Indole – 3 – acetic acid

Q.

Parthenocarpy Is Induced By______

Q.

Which hormone acts antagonistically to gibberellins?

1. Abscisic acid

2. Auxin

3. Cytokinin

4. Ethylene

Q.

Name the plant hormone that inhibits growth in plants?

Q.

How does chemical coordination occur in plants?

Q.

Which of the following plant hormone induces dormancy of seeds?

1. Auxin

2. Gibberellic acid

3. Ethylene

4. Abscisic acid

Q.

Why abscisic acid is known as dormin?

Q.

Which of these hormones stimulate the closure of stomata in epidermis of a leaf?

1. Cytokinin

2. Ethylene

3. Auxin

4. Abscissic acid

Q.

Abscisic acid plays an important role in plant growth by:

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

Q. Aging and wilting of leaves are caused and increased by which of the following plant hormone(s)?

1. Abscisic acid
2. Ethylene
3. Cytokinins
4. Auxins

Q.

Is IAA an auxin?

Q. Identify the hormone which does not promote the growth of plants.

1. Auxin
2. Gibberellins
3. Cytokinins
4. Abscisic acid

Q. Is auxin are also responsible for cell division?

Q. The plant hormone which triggers the fall of mature leaves and fruits from the plant body is _________.

1. gibberellin
2. auxin
3. abscisic acid
4. cytokinin

Q.

Question 12
Which of the following is not associated with growth of plants?

(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid

Q.

Which of the following plant hormone maintains seed dormancy?

1. Auxins

2. Gibberellins

3. Cytokinins

4. Abscisic acid

Q.

Question 35
Name the plant hormones responsible for the following

(a) Elongation of cells
(b) Growth of stem
(c) Promotion of cell division
(d) Falling of senescent leaves

Q. The hormone which has a positive effect on apical dominance is _____.

[Review question: Pg. No: 239]

Q.

_______________ in combination with auxin stimulates cell division in plants and determines the course of differentiation.

1. Cytokinin

2. Gibberellin

3. Ethylene

4. Abscisic acid

Q.

Question 6
How does phototropism occur in plants?

Q.

Senescence of leaves can be delayed by the use of:

1. Auxin

2. Gibberellin

3. Cytokinin

4. Ethylene

Q. A hormone X helps in the ripening of fruits, while Y promotes abscission of fruits. Z can induce parthenocarpy. Identify X, Y and Z correctly.

1. X- ABA, Y- Auxin, Z- Ethylene
2. X- Auxin, Y- Gibberellin, Z- Ethylene
3. X- Auxin, Y- Ethylene, Z-ABA
4. X- Ethylene, Y- ABA, Z- Gibberellin

Q. Explain the mechanism of folding of leaves of Mimosa pudica in response to touch (for 3marks question)

Q.

Is abscisic acid necessary in plant? if yes, then why?

Q.

Seed Germination is induced by ________ but inhibited by ________

Q.

Name the stress hormone, in plants which function during draught.

Q.

First cytokinin was discovered by_________.

Q. is also known as the stress hormone of plants.

1. Ethylene
2. Cytokinin
3. Abscisic acid

Q. is involved in wilting of leaves as it inhibits growth.

1. Abscisic acid
2. Gibberellin
3. Cytokinin

Q.

name the plant hormone responsible for the closure of stomata on a windy day.