Plant Growth and Development Test

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Plant Growth and Development Test - 85

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Weekly Quiz Competition

Question 1
1 / -0

Growth substance that stimulates nodule formation in leguminous plants is

A
NAA

B
IAA

C
IBA

D
ABA

Solution

Indoleacetic acid (IAA) is a type of auxin, plant hormone. It shows various effects on development of plants. It stimulates cell elongation and cell division. It also induces nodule formation in leguminous plants.
Thus, the correct answer is option B.
Question 2
1 / -0

Which of the following is used in root formation on stem cuttings?

A
Kinetin

B
$${GA}_{3}$$

C
ABA

D
IBA/IAA

Solution

Auxin is a plant hormone that is involved in various growth and developmental processes of plant. It stimulates the formation of new root on stem cuttings. Natural auxin, IAA (indoleacetic acid) and synthetic auxins, IBA and NAA are commonly used for root initiation on stem cuttings.
Thus, the correct answer is option D.
Question 3
1 / -0

First chemical identification of auxin, indole 3-acetic acid, was carried out by

A
Went

B
Thimann

C
Darwin

D
Paal

Solution

F. W. Went found that when the tip of Avena coleoptile is cut, its elongation ceases. However, when auxin was added externally, its growth renewed. He suggested that experiments suggested that auxin is synthesized in the coloptile tip and is translocated downwards towards the gravity. It moves from illuminated side to shaded side. More auxin is present on the shaded side than on illuminated side. Due to this, the plant to grow more on the shaded side and bend in the direction of the light source. It shows positive phototropism where faster cell elongation is seen on the shaded side and less on the illuminated side.
Thus, the correct answer is option A.
Question 4
1 / -0

Upright growth of lodged (horizontal) stem is due to

A
Activity of lateral meristem

B
Accumulation of more auxin on the lower side

C
Accumulation of more auxin on upper side

D
Greater cell enlargement on upper side

Solution

Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. In stems, auxin accumulates towards the lower side. It results in increase in cell expansion and results in the shoot growing upright.
Thus, the correct answer is option B.
Question 5
1 / -0

Growth of both stem and root is mediated by auxin. However, stem grows into air while root grows into soil. The reason is

A
Differential reaction of root and stem to auxin

B
Only the stem tip produces auxin

C
Only the root tip produces cytokinin

D
Only the root cap can perceive gravity

Solution

Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. This exactly opposite response of stem and root is due to changes in concentration of the auxin. Roots bend towards gravity due to regulated movement of the auxin known as polar auxin transport. Stem and root cells require differential optimum concentration for elongation. In roots, auxin accumulates towards the gravity that results in the inhibition of cell expansion on the lower side and the curvature of the roots towards gravity. In stems, auxin accumulates towards the gravity. However, it results in increase in cell expansion and results in the shoot curving up.
Thus, the correct answer is option A.
Question 6
1 / -0

The name zeatin was coined by

A
Skoog

B
Miller

C
Letham

D
Melvin

Solution

Zeatin is a natural cytokinin first isolated from maize. It is an adenine derivative. The name zeatin was coined by Letham. It stimulates cell division or cytokinesis in plants.
Thus, the correct answer is option A.
Question 7
1 / -0

Antigibberellin is

A
Cycocel

B
Plastoquinone

C
IAA

D
Ubiquinone

Solution

Cycocel is a chemical which act as anti-gibberellin. It results in the growth of thick and short stem. It is also called as dwarfing agent. It reduces growth in plant unlike gibberellin.
Thus, the correct answer is 'Cycocel'.
Question 8
1 / -0

Parthenocarpic fruit cannot be produced by application of

A
IAA

B
2, 4-D

C
ABA

D
IBA

Solution

Parthenocarpy is the process of producing seedless fruits without fertilization. Various phytohormones are used to produce parthenocarpic fruit. Auxin hormone like IAA, IBA, 2, 4 -D are most widely used to induce parthenocarpy. It can also be induced by application of gibberellin hormone.
Thus, the correct answer is option C.
Question 9
1 / -0

Avena coleoptile auxin is

A
IBA

B
Indole 3-lactic acid

C
Indole 2-acetic acid

D
Indole 3-acetic acid

Solution

Bioassay is a sensitive and specific test that determines the biological activity of hormones by measuring its effect on a specific part of plant material. There are various bioassays to determine the concentration of auxin hormone in plant such as avena coleoptile test, split pea stem curvature test, cress root inhibition test. The Avena coleoptile test is a bioassay for IAA (indole-3-acetic acid) that measures the angle of curvature of a decapitated coleoptile after placing an agar block containing auxin on one side.
Thus, the correct answer is option D.
Question 10
1 / -0

Synthetic auxins are employed for

A
Ripening of fruits

B
Increasing size of fruits

C
Killing weeds

D
Preventing elongation of internodes

Solution

Synthetic auxins like 2, 4-D and 2, 4, 5-T are used as herbicide. A 2,4-D stands for 2,4-Dichlorophenoxyacetic acid. It is a plant growth regulator. It is used as weedicide. It kills the broadleaf weeds that harm the plants by causing uncontrolled growth in them.
Thus, the correct answer is option C.

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Plant Growth and Development Test - 85

Result

Plant Growth and Development Test - 85

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SHARING IS CARING

Question 1

NAA

IAA

IBA

ABA

Solution

Question 2

Kinetin

$${GA}_{3}$$

ABA

IBA/IAA

Solution

Question 3

Went

Thimann

Darwin

Paal

Solution

Question 4

Activity of lateral meristem

Accumulation of more auxin on the lower side

Accumulation of more auxin on upper side

Greater cell enlargement on upper side

Solution

Question 5

Differential reaction of root and stem to auxin

Only the stem tip produces auxin

Only the root tip produces cytokinin

Only the root cap can perceive gravity

Solution

Question 6

Skoog

Miller

Letham

Melvin

Solution

Question 7

Cycocel

Plastoquinone

IAA

Ubiquinone

Solution

Question 8

IAA

2, 4-D

ABA

IBA

Solution

Question 9

IBA

Indole 3-lactic acid

Indole 2-acetic acid

Indole 3-acetic acid

Solution

Question 10

Ripening of fruits

Increasing size of fruits

Killing weeds

Preventing elongation of internodes

Solution

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