Role of Gibberellin

Q.

Which Plant Hormone Is Associated With Bolting?

Q. Name the plant growth regulators which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

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

Q. Match the following:

Column I	Column II
a. Weedicide	(i) GA${}_3$
b. Bolting	(ii) Cytokinin
c. Thinning of cotton	(iii) Ethylene
d. Lateral shoot growth	(iv) 2, 4-D

1. a(iii), b(ii), c(iv), d(i)
2. a(iv), b(i), c(iii), d(ii)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(ii), c(iii), d(i)

Q. Gibberellin helps in _____________

1. Curving of coleoptile towards the light
2. Cell division
3. Elongation of internodes
4. Initiation of lateral roots

Q.

Assertion (A): Genetically dwarf plants on treatment with gibberellins attain the size of normal plants

Reason(R): Gibberellins cause enormous cell elongation and intermodal length

1. Both A $\&$ R are true and R explains A

2. Both A $\&$ R true and R does not explain A

3. A is true and R is false

4. Both A $\&$ R are false

Q. One of the following is not a physiological role of gibberellins.

1. Cause fruits like apple to elongate and improve shape
2. Cause early seed production in conifers
3. Favour more female flower formation in cucurbita
4. Increase sugarcane yield by increasing stem length

Q. A plant growth hormone promotes bolting in beet. Which among the following is not an effect of this hormone?

1. Elongation of stem
2. Mobilization of food reserves
3. Fruit development
4. Ripening of fruits

Q.

Identify the correct statement related to gibberellins

1. Gibberellins are diterpenoid acids.

2. Gibberellins are synthesized from Acetyl CoA

3. GA3 is called gibberellic acid

4. Transport of gibberellins is polar

1. 1 $\&$ 2 only
2. 2 $\&$ 3 only
3. 4 only
4. 1, 2 $\&$ 3

Q. Which hormone promotes bolting?

1. Gibberellin
2. Cytokinin
3. 2, 4-D
4. Zeatin

Q.

Physiological effects of gibberellins are _______.

1. Removal of genetic dwarfism

2. Inhibition of seed germination

3. Promoting bolting and flowering

4. Formation of more male flowers in cucurbita

1. 2 alone is incorrect
2. 2 and 4 are correct
3. 3 and 4 are correct
4. 1, 3 and 4 are correct

Q. ___________ hormone breaks the dormancy of a potato tuber.

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

Q.

Genetic dwarfness in some plants may be solved by treatment with:

1. Ethylene

2. Gibberellins

3. Auxins

4. Anti gibberellins

Q.

An enzyme that can stimulate germination of barley seeds is

1. α-amylase

2. Lipase

3. Protease

4. Invertase

Q. Internodal elongation in sugarcane stem is promoted by:

1. $G{A}_3$
2. Cytokinin
3. Auxin
4. ABA