Plant Growth and Development Test

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Plant Growth and Development Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Supra optima (more than 10 ppm) concentration of auxin

A
Promotes flowering

B
Kill the plant

C
Prevent shortening of the internodes

D
Promotes growth in both, stem and roots apex

Solution

Auxin are growth promoting phytohormones. They promote growth in extremely minute quantities. At higher concentration, they are harmful and may kill the plant. The exact mechanism by which this effect is caused is not known, but it is believed that higher concentration of auxins increases growth promotion to such an extent that plant is killed, i.e., plant grows to meet its end.
Thus, the correct answer is option B.
Question 2
1 / -0

Gibberellin stimulates flowering in

A
The plants growing in Japanese farms

B
The short day plants

C
The long day plants

D
Day neutral plants

Solution

Gibberellins are hormones involved in many normal plant functions. Gibberellins affect several reproductive processes in plants. They stimulate flowering, particularly in long-day plants.
In addition, gibberellins substitute for the low temperature that biennials require before they begin flowering. If gibberellins are applied to biennials during their first year of growth, flowering occurs without exposure to a period of low temperature.
Thus, the correct answer is option C.
Question 3
1 / -0

Premature fall of fruit can be stopped by

A
Auxin

B
GA$$_{3}$$

C
ABA

D
None of the above

Solution

Auxins, help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering, e.g., in pineapples. Auxins also help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
Thus, the correct answer is option A.
Question 4
1 / -0

Gibberellin was first extracted from

A
Fusarium

B
Gellidium

C
Gracillaria

D
Aspergillus

Solution

The discovery of each of the five major groups of plant growth regulators (PGRs) have been accidental. For example, the bakane (foolish seedling) a disease of rice seedlings, was caused by a fungal pathogen; Gibberalla fujikuroi. E. Kurosawa reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus. The active substances were later identified as gibberellic acid.
Thus, the correct answer is option A.
Question 5
1 / -0

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

A
Auxin

B
Gibberellins

C
Cytokinin

D
Ethylene

Solution

Gibberellins affect several reproductive processes in plants. They stimulate flowering, particularly in long-day plants. In addition, gibberellins substitute for the low temperature that biennials require before they begin flowering. If gibberellins are applied to biennials during their first year of growth, flowering occurs without exposure to a period of low temperature.
Thus, the correct answer is option B.
Question 6
1 / -0

Cytokinin

A
Is a hormone whose main function is to induce the cell division.

B
Is the process of cell division.

C
Refers to cell division.

D
Causes dormancy.

Solution

Cytokinins are phytohormones which have specific effects on cytokinesis and were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA. Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk. Since, the discovery of zeatin, several naturally occurring cytokinins and some synthetic compounds with cell division promoting activity, have been identified. Natural cytokinins are synthesised in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits etc.
Thus, the correct answer is option A.
Question 7
1 / -0

The plant hormone, which is synthesized in root and translocated to aerial
parts is

A
Auxin

B
Cytokinin

C
Traumatin

D
Morphactin

Solution

Cytokinin are growth promoting phytohormones. Cytokinins are structurally similar to adenine, a purine base that is part of DNA and RNA molecules. Cytokinins are predominantly synthesized in roots. One effect of cytokinins on plant cells is to delay the aging process. Plant cells, like all living cells, go through a natural aging process known as senescence.
Thus, the correct answer is option B.
Question 8
1 / -0

Hormone involved in photoperiodism is

A
IAA

B
Gibberellin

C
Kinetin

D
2, 4-D

Solution

Gibberellins affect several reproductive processes in plants. They stimulate flowering, particularly in long-day plants (photoperiodism). In addition, gibberellins substitute for the low temperature that biennials require before they begin flowering (vernalisation).
Thus, the correct answer is option B.
Question 9
1 / -0

Internodal elongation is stimulated by ....................

A
Auxin

B
Cytokinin

C
Gibberellin

D
Phenol

Solution

Gibberellins are a kind of growth promotery PGR. There are more than 100 gibberellins reported from widely different organisms such as fungi and higher plants. They are denoted as GA1, GA2, GA3 and so on. However, Gibberellic acid (GA3) was one of the first gibberellins to be discovered and remains the most intensively studied form. All GAs are acidic. They produce a wide range of physiological responses in the plants. Their ability to cause an increase in length of axis is used to increase the length of grapes stalks. Gibberellins, cause fruits like apple to elongate and improve its shape. They also delay senescence. Thus, the fruits can be left on the tree longer so as to extend the market period. GA3 is used to speed up the malting process in brewing industry.
Question 10
1 / -0

The excised leaf does not turn yellow if it is induced to root. This is
attributed to ....................

A
Ethylene

B
Cytokinins

C
Gibberelins

D
Auxins

Solution

One effect of cytokinins on plant cells is to delay the aging process. Plant cells, like all living cells, go through a natural aging process known as senescence. Senescence is accelerated in cells of plant parts that are cut, such as flower stems. Botanists think that plants must have a continual supply of cytokinins from the roots. Cut stems, of course, lose their source of cytokinins and therefore age rapidly. When cytokinins are sprayed on leaves of a cut stem of many species, they remain green, whereas unsprayed leaves turn yellow and die.

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Plant Growth and Development Test - 37

Result

Plant Growth and Development Test - 37

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SHARING IS CARING

Question 1

Promotes flowering

Kill the plant

Prevent shortening of the internodes

Promotes growth in both, stem and roots apex

Solution

Question 2

The plants growing in Japanese farms

The short day plants

The long day plants

Day neutral plants

Solution

Question 3

Auxin

GA$$_{3}$$

ABA

None of the above

Solution

Question 4

Fusarium

Gellidium

Gracillaria

Aspergillus

Solution

Question 5

Auxin

Gibberellins

Cytokinin

Ethylene

Solution

Question 6

Is a hormone whose main function is to induce the cell division.

Is the process of cell division.

Refers to cell division.

Causes dormancy.

Solution

Question 7

Auxin

Cytokinin

Traumatin

Morphactin

Solution

Question 8

IAA

Gibberellin

Kinetin

2, 4-D

Solution

Question 9

Auxin

Cytokinin

Gibberellin

Phenol

Solution

Question 10

Ethylene

Cytokinins

Gibberelins

Auxins

Solution

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