Plant Growth and Development Test

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Plant Growth and Development Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

The hormone which promotes flowering in long day conditions and controls sex expression is

A
Auxin

B
Cytokinins

C
Gibberellins

D
Ethylene

Solution

Gibberellin is a plant hormone which helps in growth of stem. The rapid growth and flowering is called as bolting. Bolting requires either long days or cold treatment. However, it can be induced artificially by the application of gibberellin under normal conditions. Hence, it replaces the long day conditions required for flowering. It also controls sex expression in many plant species. It promotes maleness in flower.
Thus, the correct answer is option C.
Question 2
1 / -0

Cytokinins are mostly

A
Glucosides

B
Aminopurines

C
Acidic

D
Phenolic

Solution

The first cytokinin discovered was an aminopurine derivative named kinetin. Except zeatin which is adenine derivative, all other present cytokinins are aminopurines. All the naturally occurring cytokinins are substituted purines, in which sixth carbon is substituted by amino group.
Thus, the correct answer is 'Glucosides'.
Question 3
1 / -0

Plant hormone controlling fruit ripening is

A
IAA

B
GA

C
Ethylene

D
Kinetin

Solution

Ethylene is a gaseous plant hormone. It is also called as ripening hormone as it plays the important role in controlling the fruit ripening. During fruits ripening, the respiration rate in fruits is increased by ethylene. Due to increased respiration, complex carbohydrates are broken down into simpler sugars and cell wall becomes soft.
Thus, the correct answer is option C.
Question 4
1 / -0

Hormone that promotes growth of lateral buds/has negative effect on apical dominance is

A
Cytokinin

B
Gibberellin

C
Auxin

D
Both B and C

Solution

Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones auxin produced in the tip of the shoot. It promotes apical dominance and does not allow lateral / axillar buds to grow. Another plant hormone, cytokinin is responsible for having negative effect on the apical dominance. It promotes the growth of lateral buds.
So, the correct answer is 'Cytokinin'
Question 5
1 / -0

Auxin takes part in

A
Promotion of cell division

B
Promotion of cell enlargement

C
Promotion of fruit ripening

D
Inhibition of shoot growth

Solution

Auxin is a plant hormone which regulates plant growth and development. It takes part in promotion of cell expansion. It also aids in shoot growth.
So, the correct answer is 'Promotion of cell enlargement'
Question 6
1 / -0

Interfascicular cambium formation is induced by

A
Auxin

B
Cytokinin

C
Gibberellin

D
Ethylene

Solution

Cytokinin is a plant hormone which is involved in growth and development of plants. It is required for the cambial growth. Kinetin, a type of cytokinin promotes cell division. It induces formation of interfascicular cambium in plants.
Thus, the correct answer is option B.
Question 7
1 / -0

Gibberellins induce

A
Cell division

B
Leaf senescence

C
Hydrolysing enzymes in germinating seeds

D
Flowering

Solution

Gibberellin is a plant hormone. It breaks the seed dormancy. It also induces germination of seeds by producing hydrolyzing enzymes in seeds. It also helps in stem elongation.
Thus, the correct answer is option C.
Question 8
1 / -0

Kinetin is

A
Indolebutyric acid

B
Indole acetic acid

C
Butyric acid

D
6-furfuryl amino-purine

Solution

Kinetin is a type of cytokinin, a plant hormone. It is involved in cell division. Chemically it is 6-furfuryl amino-purine. It stimulates growth and development in plant.
Thus, the correct answer is option D.
Question 9
1 / -0

Movement of auxin is

A
Centripetal

B
Basipetal

C
Acropetal

D
Both B and C

Solution

Auxin is a plant hormone which is involved in various physiological processes of plant. It is synthesized in meristematic tissue like tip of root and stem. In stems, movement of auxin is basipetal. It moves from apex to the base. However, in roots, movement of auxin is acropetal. It moves from the root to the shoot apex.
Thus, the correct answer is option D.
Question 10
1 / -0

Which one is used for defoliation of forest trees?

A
Phosphon D

B
Maleic hydrazide

C
AMO 1618

D
$$2, 4-D$$

Solution

Defoliation is the phenomenon of removal of plant material. It is done by various ways like mowing, burning, grazing and applying herbicide. In is done purposely to protect tree and to remove unwanted grass. Chemical like 2, 4-D is used for defoliation of forest trees. It is a weedicide.
Thus, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 60

Result

Plant Growth and Development Test - 60

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SHARING IS CARING

Question 1

Auxin

Cytokinins

Gibberellins

Ethylene

Solution

Question 2

Glucosides

Aminopurines

Acidic

Phenolic

Solution

Question 3

IAA

GA

Ethylene

Kinetin

Solution

Question 4

Cytokinin

Gibberellin

Auxin

Both B and C

Solution

Question 5

Promotion of cell division

Promotion of cell enlargement

Promotion of fruit ripening

Inhibition of shoot growth

Solution

Question 6

Auxin

Cytokinin

Gibberellin

Ethylene

Solution

Question 7

Cell division

Leaf senescence

Hydrolysing enzymes in germinating seeds

Flowering

Solution

Question 8

Indolebutyric acid

Indole acetic acid

Butyric acid

6-furfuryl amino-purine

Solution

Question 9

Centripetal

Basipetal

Acropetal

Both B and C

Solution

Question 10

Phosphon D

Maleic hydrazide

AMO 1618

$$2, 4-D$$

Solution

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