Gibberellin

Q.

Which one of the following acids is a derivative of carotenoids?

1. Indole Butyric acid

2. Abscisic acid

3. Gibberellic acid

4. Indole-3-acetic-acid

Q.

Gibberellins can promote seed germination because of their influence on

1. Synthesis of abscisic acid

2. Production of hydrolyzing enzymes

3. Rate of cell division

4. Absorption of water through the hard seed coat.

Q. Bakanae disease of rice seedlings is related to discovery of

1. auxin
2. gibberellin
3. ethylene
4. cytokinin

Q.

In the process of apical dominance lateral buds are unable to grow in the presence of apical buds this is due to

1. more auxin in the lateral buds.

2. less auxin in the lateral buds.

3. more cytokinins in lateral buds.

4. less cytokinins in lateral buds.

Q.

Question 09:

To increase sugar production in sugarcanes, they are sprayed with
(a) IAA
(b) cytokinin
(c) gibberellin
(d) ethylene

Q.

The Avena curvature is used for bioassay of

1. Ethylene

2. IAA

3. GA₃

4. ABA

Q.

"Foolish Seedling" disease of rice led to the discovery of:

1. IAA

2. GA

3. ABA

4. 2, 4-D

Q.

Which phytohormone would you use if you are asked to bolt a rosette plant?

1. Gibberellin

2. Auxin

3. Cytokinin

4. None of these

Q.

Which one of the following pairs is not correctly matched?

1. Gibberellic acid -Leaf fall

2. Abscisic acid -Stomatal closure

3. Cytokinin -Cell division

4. IAA -Cell wall elongation

Q. Which of the following statements is incorrect about gibberellins

1. E.Kurosawa studied the foolish seedling disease which was caused by a fungal pathogen Gibberella fujikuroi.
2. It promotes bolting.
3. It helps in improving the shape of fruits.
4. All gibberellins are basic.

Q. Which of the following PGR induces parthenocarpy in tomatoes?

1. Auxin
2. Gibberellin
3. Ethylene
4. Cytokinin

Q.

What is cytokinin in human body?

Q.

Give one word for the following:

A gaseous plant growth regulator.

Q. The hormone isolated from the rice plants that were infected by 'foolish seedling disease' is _______.

1. Cytokinins

2. Auxins

3. ABA

4. Gibberellins

Q.

Name the causative agent of Ascariasis.

Q. Gibberellins can promote seed germination because of their influence on:

1. rate of cell division
2. production of hydrolysing enzymes
3. synthesis of abscisic acid
4. absorption of water through hard seed coat

Q.

Question 25:

The rice seedlings infected with fungus Gibberella fujikuroi is called foolish seedlings? What was the reason behind it?

Q. Arrange in increasing order of the strenght of acids Acetic acid, carbonic acid, sulphuric acid. (with reason)

Q.

Micropropagation is a technique

1. For production of somatic hybrids

2. For production of true to type plants

3. For production of somaclonal plants

4. For production of haploid plants

Q.

Plant growth regulator present in the sterile filtrates of the fungus?

1. Inhibitor B

2. Adenine derivative

3. Indole conpound

4. Gibberellic acid

Q. Moving on grass lawn facilitates better maintenance because

1. removal of apical dominance and stimulation of intercalary meristem
2. wounding stimulates regeneration
3. removal of apical dominance and promotion of lateral meristem
4. of removal of apical dominance

Q. Most abundant naturally occurring auxin is

1. 2, 4 - D

2. PAA

3. 2, 4, 5 - T

4. IAA

Q. The first attempt to show linkage in plants was done by Bateson and Punnett in

1. Oenothera lamarckiana
2. Pisum sativum
3. Lathyrus odaratus
4. Zea maize

Q.

"Foolish Seedling" disease of rice led to the discovery of:

1. IAA

2. GA

3. ABA

4. 2, 4-D

Q. V-amylase test is a bioassay for ______.

1. auxins
2. GA
3. cytokinin
4. ABA

Q.

Cell elongation in internodal regions of the green plants takes place due to:

1. Cytokinins

2. Gibberellins

3. Ethylene

4. Indole acetic acid

Q. Hormone involved in photoperiodism is

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

Q. Write the main functions of gibberellins.

Q. Growth substance that simulates nodule formation in leguminous plants is

1. ABA
2. NAA
3. IAA
4. IBA

Q. what is meant by concentrated aqueous acid