Plant Growth and Development Test

Result

Plant Growth and Development Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following properties is shown by cytokinins?

A
Delay in leaf senescence

B
Cause leaf abscission

C
Promote seed dormancy

D
Promote stornatal closing

Solution

Cytokinins is the growth hormone that promotes growth, cell division and delay leaf senescence.
Question 2
1 / -0

The bioassay of auxin is

A
Avena curvature test

B
Callus formation

C
Culture of fungus

D
Seed dormancy

Solution

The shoot tip of a plant is removed and placed on an agar block so that the auxin diffuses into the agar. The agar piece is cut after some time and is placed on one side of the coleoptile of the plant from where the shoot tip was obtained. An angle of curvature is obtained. This is called avena curvature that helps in determining the biological activity of IAA. Thus the correct answer is option A.
Question 3
1 / -0

The discovery of gibberellins is related with one of the following?

A
Blast disease of rice

B
Rust disease of wheat

C
'Bakanae' disease of rice

D
Early blight disease of potato

Solution

Gibberellin was first observed by Eiichi Kurosawa in 1926 in rice, which was infected with bakanae, the foolish seedling disease. Bakanae shows etiolated symptom, caused by the disease as a result of gibberellin production by the causative organism Gibberella fujikuroi upon infection of the host.
Question 4
1 / -0

Genetic dwarfism can be overcome by

A
Gibberellin

B
Ethylene

C
Auxin

D
ABA

Solution

One of the functions of gibberellin is to promote stem elongation. When it is used on a dwarf plant the length of the internode increases. This increase in the internode length results in the plant growing taller. This property of gibberellin is used in order to overcome genetic dwarfism. Thus the correct answer is option A.
Question 5
1 / -0

I. Assertion: Seeds and growing fruit are rich in cytokinin.
II. Reason: Cytokinin promotes cell division.

A
I and II both are true, II is not correct explanation for I

B
I and II both are false

C
I is false II is true

D
I and II both are true, II is correct explanation for I

Solution

Cytokinin promotes cell division and cell elongation. Thus they are found in the region where there is rapid cell division like fruits and seeds.
Question 6
1 / -0

To test the effect of an auxin on plant growth, the auxin was dissolved in a gelatin block. Several plant seedlings were prepared and growth was measured every five days.
Plant
Growth after 5 days
Growth after 10 days
1
15 mm
29 mm
2
4 mm
9 mm
3
5 mm
10 mm
4
14 mm
31 mm
5
8 mm
20 mm
In a separate experiment, an auxin/gelatin block applied to only half the cut edge of the tip caused the plant to grow and bend in the opposite direction. For example, if the gelatin block was applied to the left side of the cut edge, the plant grew and bent toward the right. Which of the following is the most likely explanation for this observation?

A
Sunlight caused the plant to bend.

B
The plant exhibited gravitropism.

C
Auxin stimulated cell division on the opposite side of the plant.

D
Auxin stimulated cell division on the same side of the plant.

E
Auxin stimulated cell growth toward a light source

Solution

If the light is coming from right the plant will bend to the right and cells on the left side of the plant must grow faster than cells on the right. If the light is coming from left then the plant will bend to the left and the opposite must occur; cells must grow faster on the right than on the left. Auxin applied to half the plant causes the plant to bend in the opposite direction; for example, auxin on the left stimulates bending to the right. Bending to the right means growth on the left; therefore, auxin must stimulate growth on the same side of the plant to which it is attached.
Question 7
1 / -0

"One bad apple spoils the whole barrel" because of

A
Ethylene gas

B
Abscisic acid

C
Auxin

D
Gibberellins

E
Cytokinins

Solution

Ethylene gas is the plant hormone that promotes fruit ripening and rotting. It also controls flower wilting and leaf fall by stimulating the conversion of starch and acid to sugars. Therefore, it is said that one bad apple will spoil the whole barrel because of ethylene gas.
Therefore, the correct answer is option A.
Question 8
1 / -0

Which hormone is responsible for spoiling the whole barrel containing one bad apple?

A
Ethylene gas

B
Abscisic acid

C
Auxin

D
Gibberellins

E
Cytokinins

Solution

Ethylene is gaseous hormone promotes fruit ripening and abscission. It diffuses from the rotten apple to other apples in the barrel and thereby causing spoilage of the whole barrel. ABA, auxins, gibberellins and cytokines are not gaseous hormones and therefore can not diffuse from one fruit to other. Thus, the correct answer is A.
Question 9
1 / -0

Name of a gaseous plant hormone is

A
IAA

B
Gibberellin

C
Ethylene

D
Abscisic acid

Solution

Ethylene is a gaseous plant hormone also known as the ripening hormone. It is synthesized in ripening fruits, flowers, leaves, and even roots. It initiates a chain of reactions in fruits responsible for the changes in texture, softening, color and other processes. This hormone also induces leaf abscission, seed germination, leaf and flower senescence. Thus the correct answer is option C.
Question 10
1 / -0

In the fall, the leaves of deciduous trees change color, fall off and die. This shedding of leaves is Mated by which of the following plant hormones?

A
auxin

B
gibberellin

C
abscisic acid

D
cytokinin

E
ethylene

Solution

A. Auxin plays role in cell elongation, apical dominance, root initiation, prevention of abscission, induction of parthenocarpy and also used as herbicide.
B. Gibberellin plays role in stem elongation, seed germination, breaking dormancy, elongation of internodes and inducing parthenocarpy.
C. Abscisic acid or ABA is known as stress hormone and induces stomatal closure, provides defence against salt and cold stress, induces dormancy, causes geotropism in roots and abscission of leaves, flowers and fruits.
D. Cytokinin plays role in promoting cell division and organ formation, delay in senescence, promoting lateral bud development in dicots, cell expansion in cotyledons leaves, promoting chloroplast development and chlorophyll synthesis.
E. Ethylene is a gaseous hormone and causes ripening of fruit.
So, the correct answer is 'Abscisic acid'.

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Plant	Growth after 5 days	Growth after 10 days
1	15 mm	29 mm
2	4 mm	9 mm
3	5 mm	10 mm
4	14 mm	31 mm
5	8 mm	20 mm

Plant Growth and Development Test - 49

Result

Plant Growth and Development Test - 49

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Rank

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SHARING IS CARING

Question 1

Delay in leaf senescence

Cause leaf abscission

Promote seed dormancy

Promote stornatal closing

Solution

Question 2

Avena curvature test

Callus formation

Culture of fungus

Seed dormancy

Solution

Question 3

Blast disease of rice

Rust disease of wheat

'Bakanae' disease of rice

Early blight disease of potato

Solution

Question 4

Gibberellin

Ethylene

Auxin

ABA

Solution

Question 5

I and II both are true, II is not correct explanation for I

I and II both are false

I is false II is true

I and II both are true, II is correct explanation for I

Solution

Question 6

Sunlight caused the plant to bend.

The plant exhibited gravitropism.

Auxin stimulated cell division on the opposite side of the plant.

Auxin stimulated cell division on the same side of the plant.

Auxin stimulated cell growth toward a light source

Solution

Question 7

Ethylene gas

Abscisic acid

Auxin

Gibberellins

Cytokinins

Solution

Question 8

Ethylene gas

Abscisic acid

Auxin

Gibberellins

Cytokinins

Solution

Question 9

IAA

Gibberellin

Ethylene

Abscisic acid

Solution

Question 10

auxin

gibberellin

abscisic acid

cytokinin

ethylene

Solution

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