Plant Growth and Development Test

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Plant Growth and Development Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

One of the preventive methods of fruit is by spraying ...........

A
Auxin

B
Ethylene gas

C
Gibberellins

D
Cytokinin

Solution

One of the preventive and effective methods to be adopted in fruits is to spray auxin. Abscission layer is produced when the auxin content falls below a minimum. Application of auxin retards the abscission of leaves, fruits, branches, etc.
Question 2
1 / -0

Which one of the following plant function is not generally governed or controlled by auxin?

A
Apical dominance

B
Phototropism

C
Photosynthesis

D
Growth

Solution

Auxin is the plant hormone concerned with apical dominance, phototropism and growth. Whereas photosynthesis is a light dependent anabolic process which is never dependent on auxin hormone.
Question 3
1 / -0

$$\alpha $$-amylase synthesis is induced by _____

A
IAA

B
GA

C
Cytokinin

D
All of the above

Solution

Alpha amylase synthesis is induced by gibberellic acid. Gibberellic acid (GA), enhances the synthesis of alpha amylase in isolated aleurone layers of barley seeds. GA does not merely trigger alpha amylase synthesis, but it is continuously required during the period of enzyme formation. Enzyme synthesis is inhibited by inhibitors of protein and RNA synthesis.
So, the correct answer is 'GA'
Question 4
1 / -0

Cell elongation in internodal region takes place due to .................

A
Gibberellins

B
Ethylene

C
Cytokinins

D
Indole acetic acid

Solution

Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other processes in plants, including stem elongation, germination, flowering and fruit ripening.
Question 5
1 / -0

Which of the following plant hormone substitutes for long photoperiods in flowering plants?

A
Auxins

B
Gibberellins

C
Cytokinins

D
Ethylene
Solution
- Photoperiodism is the ability of plants and animals to measure environmental day length to ascertain the time of year.
- The GA-induced bolting in rosettes is exploited commercially to induce the early production of seeds. When a cabbage head is kept under warm nights, it retains its rosette habit.
- Bolting can be induced artificially by the application of gibberellins under normal conditions.
So, the correct answer is option B.
Question 6
1 / -0

Genetic dwarfness can be overcome by treating with ..................

A
Cytokinin

B
Auxins

C
Gibberellins

D
Ethylene

Solution

Spraying of gibberellic acid on dwarf plants can help in overcoming the dwarf effect of the gene present in the plant. It is because this phytohormone is responsible for the plants to grow long. It also promotes cell elongation, bolting and so on. Thus, the correct answer is option C.
Question 7
1 / -0

The chemical nature of gibberellins is that, they are ............

A
Acidic

B
Alkaline

C
Proteinaceous

D
Amines

Solution

Gibberellins are acidic in nature. Because of that reason, it is usually mentioned as gibberellic acid, abbreviated as GA. It is a phytohormone which has diversified effects on the plant life cycle.
Question 8
1 / -0

Gibberellins cause ..............
or
Gibberellins stimulate ................

A
Elongation of internodes

B
Curvature of coleoptile

C
Cell division

D
Initiation of lateral roots
Solution
- Gibberellic acid stimulates intercalary meristem which promotes elongation of the internode. This is called as bolting effect.
- Bolting is when agricultural and horticultural crops prematurely produce a flowering stem before the crop is harvested in a natural attempt to produce seeds.
So, the correct answer is option A.
Question 9
1 / -0

Gibberelic acid induces flowering

A
In some gymnospermic plants only

B
In long day plants under short day conditions

C
In short day plants under long day conditions

D
In day neutral plants under dark conditions
Question 10
1 / -0

Which one of the following pairs, is not correctly matched?

A
Abscissic acid - Stomatal closure

B
Gibberellic acid - Leaf fall

C
Cytokinin - Cell division

D
IAA - Cell wall elongation
Solution
Correct option: B
Explanation:
Gibberellic acid is concerned with rapid root and stem growth, leaf cell division and also increase the rate of seed germination.
Leaf fall is associated with the hormone abscisic acid.
Abscisic acid is also called the stress hormone as it is released when the plant is under stress.
Hence, "Gibberellic acid - Leaf fall" is not correctly matched.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 20

Result

Plant Growth and Development Test - 20

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Question 1

Auxin

Ethylene gas

Gibberellins

Cytokinin

Solution

Question 2

Apical dominance

Phototropism

Photosynthesis

Growth

Solution

Question 3

IAA

GA

Cytokinin

All of the above

Solution

Question 4

Gibberellins

Ethylene

Cytokinins

Indole acetic acid

Solution

Question 5

Auxins

Gibberellins

Cytokinins

Ethylene

Solution

Question 6

Cytokinin

Auxins

Gibberellins

Ethylene

Solution

Question 7

Acidic

Alkaline

Proteinaceous

Amines

Solution

Question 8

Elongation of internodes

Curvature of coleoptile

Cell division

Initiation of lateral roots

Solution

Question 9

In some gymnospermic plants only

In long day plants under short day conditions

In short day plants under long day conditions

In day neutral plants under dark conditions

Question 10

Abscissic acid - Stomatal closure

Gibberellic acid - Leaf fall

Cytokinin - Cell division

IAA - Cell wall elongation

Solution

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