Plant Growth and Development Test

Result

Plant Growth and Development Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

Which among the following is not a function of cytokinins?

A
Essential for Cytokinesis during cell division

B
Delays the senescence of leaves

C
Helps in fruit ripening

D
Helps to overcome apical dominance

Solution

Fruit ripening or climacteric fruit ripening is induced by ethylene in most of the fruits, and therefore is not a function of cytokinins.
So, the correct answer is 'Helps in fruit ripening'
Question 2
1 / -0

If a rotten fruit gets mixed with unripe fruits, the unripe fruits will _____________.

A
also be rotten

B
ripe quickly

C
remain unchanged

D
none of these.

Solution

Ethylene production by plants is autocalalytic, i.e., a small amount of ethylene will stimulate production of its larger amounts. Thus, a few ripe fruits will initiate ripening of nearby fruits. It is, therefore, a common practice to keep few ripe bananas with unripe bananas to hasten ripening.
Question 3
1 / -0

A plant hormone used for Inducing morphogenesis in plant tissue culture is ______________.

A
abscisic acid

B
gibberellin

C
cytokinin

D
ethylene.

Solution

Cytokinins play a vital role in morphogenesis in plants. It opposes initiation of roots in stem cuttings treated with auxin and results in the formation of callus at the cut end. It is now well known that kinetin-auxin interaction controls the momhogenetic differentiation of shoot and root meristems.
Question 4
1 / -0

The most widely used compound as a source of $$C_2H_4$$ is ____________.

A
kinetin

B
zeatin

C
IBA

D
ethephon

Solution

Ethephon, 2-chloroethyl phosphonic acid (Ethrel) is a source of ethylene used commercially. It is used in aqueous solution and releases ethylene slowly.
Question 5
1 / -0

Match column I with column II and select the correct option from the codes given below.
Column I Column II
A. Natural auxin (i) NAA
B. Synthetic auxin (ii) Zeatin
C. Bakane disease of rice (iii) IAA
D. Natural cytokinin (iv) GA
(v) Kinetin

A
A - (iii), B - (i), C - (iv), D - (ii)

B
A - (i), B - (iii), C - (iv), D - (v)

C
A - (iii), B - (i), C - (iv), D - (v)

D
A - (iv), B - (i), C - (v), D - (ii)

Solution

A) Five naturally occurring (endogenous) auxins in plants include indole-3-acetic acid, 4-chloroindole-3-acetic acid, phenylacetic acid, indole-3-butyric acid, and indole-3-propionic acid. B) Synthetic auxin analogs include 1-naphthaleneacetic acid, 2,4-dichlorophenoxyacetic acid (2,4-D), and many others.
C) GA can be a way to control Bakane disease of rice instead of introducing many genes. D) Some of the naturally occurring cytokinins are 6-Furfuryl-aminopurine, Ribosyl Zeatin (immature corns), Zeatin, Isopentinyladenine and Dihydrozeatin.
Thus, the correct answers is 'A - (iii), B - (i), C - (iv), D - (ii).'
Question 6
1 / -0

Cytokinins help to produce all except

A
New leaves

B
Chloroplast in leaves

C
Lateral shoot growth and adventitious shoot formation

D
Rooting on the cut stem
Solution
- Rooting of the cut stem is induced by spraying synthetic auxins like Naphthalene Acetic Acid (NAA) and not cytokinins, in plants that are vegetatively propagated by stem cuttings.
So, the correct answer is 'Rooting on the cut stem'.
Question 7
1 / -0

Hormone primarily concern with cell division is

A
IAA

B
NAA

C
Cytokinin

D
Gibberellic acid.

Solution

Cytokinin helps in cytokinesis. Cytokinin induces cell division in the shoots. Cytokinin positively regulates cell cycle along with auxin.
Thus, the correct answer is 'Cytokinin.'
Question 8
1 / -0

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

A
Cytokinin

B
Gibberellin

C
Auxin

D
Both (b) and (c).
Question 9
1 / -0

The activity of $$\alpha$$-amylase in the endosperm of a germinating seed of barley is induced by

A
Ethylene

B
Cytokinin

C
IAA

D
Gibberellin

Solution

Gibberellic acid induces de novo(a new) synthesis of various hydrolytic enzymes, such as $$\alpha$$-amylase, ribonuclease, $$\alpha$$-1, 3-glucanase and protease in aleurone cells of barley grains. This has been experimentally shown by isolating the aleurone layer and treating it with gibberellin solution. These enzymes are mobilized to endosperm during germination and hydrolyze the storage reserve.
So the correct answer is 'gibberellin'.

Question 10

1 / -0

ABA acts antagonistic to

Ethylene

Cytokinin

Gibberellic acid

IAA

Solution

Abscisic acid is an antagonist to gibberellins as shown in the table given below:

Abscisic acid	Gibberellic acid
It inhibits growth.	It promotes growth.
It promotes the dormancy of seeds, buds, and tubers.	It overcomes the natural dormancy of seeds, tubers, etc.
It inhibits the synthesis of RNA and proteins.	It promotes the synthesis of RNA and Proteins.
Causes abscission of flowers and fruits.	Promotes the development of fruits.
Promotes leaf senescence.	Prevents leaf senescence.
Promotes stomata! closure.	Promotes stomatal opening.
Prevents amylase activity.	Promotes amylase activity during seed germination.

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	Column I		Column II
A.	Natural auxin	(i)	NAA
B.	Synthetic auxin	(ii)	Zeatin
C.	Bakane disease of rice	(iii)	IAA
D.	Natural cytokinin	(iv)	GA
		(v)	Kinetin

Plant Growth and Development Test - 73

Result

Plant Growth and Development Test - 73

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Question 1

Essential for Cytokinesis during cell division

Delays the senescence of leaves

Helps in fruit ripening

Helps to overcome apical dominance

Solution

Question 2

also be rotten

ripe quickly

remain unchanged

none of these.

Solution

Question 3

abscisic acid

gibberellin

cytokinin

ethylene.

Solution

Question 4

kinetin

zeatin

IBA

ethephon

Solution

Question 5

A - (iii), B - (i), C - (iv), D - (ii)

A - (i), B - (iii), C - (iv), D - (v)

A - (iii), B - (i), C - (iv), D - (v)

A - (iv), B - (i), C - (v), D - (ii)

Solution

Question 6

New leaves

Chloroplast in leaves

Lateral shoot growth and adventitious shoot formation

Rooting on the cut stem

Solution

Question 7

IAA

NAA

Cytokinin

Gibberellic acid.

Solution

Question 8

Cytokinin

Gibberellin

Auxin

Both (b) and (c).

Question 9

Ethylene

Cytokinin

IAA

Gibberellin

Solution

Question 10

Ethylene

Cytokinin

Gibberellic acid

IAA

Solution

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