Plant Growth and Development Test

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Plant Growth and Development Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

At the onset of seed germination, the digestive enzyme amylase is produced by the action of ..............

A
Auxins

B
Gibberellins

C
Cytokinins

D
Ethylene

Solution

Gibberellins break seed dormancy of buds and tubers. But in root tubers, it inhibits the development of root tuber. It enhances seed germination by enhancing alpha amylase synthesis and thus results in breaking seed dormancy. Thus, the production of digestive enzymes like alpha amylase is an action of gibberellin.
Question 2
1 / -0

Gibberellic acid is a product of .......

A
Algae

B
Gibberella fujikuroi

C
Protein

D
None of the above

Solution

Gibberellic acid is produced from Gibberella fujikori fungus. It is a fungal plant pathogen. It causes bakane disease in rice seedlings, by overloading them with the phytohormone gibberellin as its own metabolic product.
Question 3
1 / -0

Bakane disease in paddy is caused by .................

A
Abscissic acid

B
Gibberellic acid

C
Phenyl acetic acid

D
Naphthalene acetic acid

Solution

Gibberella fujikori is a fungal plant pathogen. It causes bakane disease in rice seedlings, by overloading them with the phytohormone gibberellin as its own metabolic product.
Question 4
1 / -0

Gibberellins differ from auxins since they cause

A
Cell division

B
Stem elongation

C
Root initiation

D
Shortening of internodes
Solution
Auxin has various physiological effects in plants such as cell elongation, apical dominance, root initiation, prevention of abscission, and inducing parthenocarpy.
Gibberellin has physiological effects on plants such as stem elongation, seed germination, breaking dormancy, elongation of internodes, and inducing parthenocarpy.
Hence, stem elongation is due to Gibberellin.
So, the correct answer is 'Stem elongation'.
Question 5
1 / -0

The gibberellins are plant growth hormones. They cause elongation of stem. Gibberellin was first isolated by Japanese workers from .........

A
Endosperm of barley

B
Sporophyte of moss

C
A parasitic fungus

D
Scutellum of rice

Solution

Japanese workers first isolated the fungal pathogen causing foolish seedling disease in rice seedlings from an ascomycota fungi called as Gibberella fujikori. It is a plant pathogen. It acts by producing GA as the side product of metabolism and thus overloading the same.
Question 6
1 / -0

Gibberellin is obtained from a .................

A
Fungus

B
Alga

C
Basidiolichen

D
Flowering plants

Solution

Gibberellin is obtained from a fungus, named as Gibberella fujikori. It is a fungal plant pathogen which causes bakane disease in rice seedlings. It is done with the overloading of gibberellic acid as its own metabolic byproduct.
Question 7
1 / -0

Gibberellin is ..............

A
Sugar

B
Sterol

C
Vitamin

D
None of the above

Solution

Gibberellin is a phytohormone which is usually found in acidic nature and hence called as gibberellic acid. The same is always abbreviated as GA.
Question 8
1 / -0

The process in which mature differentiated cells reverse to meristematic activity to form callus is called

A
Dedifferentiation

B
Differentiation

C
Cytodifferentiation

D
Redifferentiation
Solution
- The cells from the cambium, root apical meristem, and shoot apical meristem differentiate to do various functions. When these differentiated cells regain the capacity to undergo mitotic division the phenomenon is called differentiation.
- Differentiation is the process in which cells of the root system shoot apical meristem and the cambium mature to perform specific functions.
- Cytodifferentiation occurs either spontaneously or under the stimulus of specific nutritional or hormonal factors.
- A dedifferentiated plant cell once again loses its capacity to divide and becomes mature. This phenomenon is called redifferentiation.
- Thus, the correct answer is option A.
Question 9
1 / -0

The rosette habit of cabbage can be changed by application of ........

A
IAA

B
GA

C
ABA

D
Ethaphon

Solution

The rosette nature of cabbage could be changed by the application GA. It helps in inducing bolting, which results in the elongation of stem of the plant.
Question 10
1 / -0

Cytokinin is a hormone whose main function is ..................

A
Induction of cell division and delay in senescence

B
To take part in cell division

C
Refers to cell movements

D
To cause dormancy

Solution

Cytokinins are a class of plant growth substances that promote cell division, or cytokinesis, in plant roots and shoots. They are derivatives of pure adenine. It is a true cell division factor, promotes meristematic tissue regions. It prevents destruction of chlorophyll in leaves.