Plant Growth and Development Test

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Plant Growth and Development Test - 81

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Question 1
1 / -0

Pormalin is sprayed over apple to increase fruit size, it is

A
Auxin

B
Mixture of auxin and gibberellin

C
Mixture of auxin and cytokinin

D
Mixture of cytokinin and gibberellin

Solution

Promalin improves the shape and increases the size of red delicious apples. Promalin contains the mixture of cytokinin and gibbrellin.
It is a plant growth regulator that enhances fruit size and weight through the elongation of fruit and development of more prominent calyx lobes.
Question 2
1 / -0

Cytokinins are known to

A
Inhibit cytopasmic movement

B
Help in retention of chlorophyll

C
Influence water movement

D
Promote adscission layer formation

Solution

Cytokinins are plant hormones that have an important role in growth and development of plant. It plays important role in controlling aging process. Senescence of leaves is delayed when cytokinin is sprayed to the leaves as it helps in retention of chlorophyll. Hence, it keeps leaves green for longer time.
Thus, the correct answer is option B.
Question 3
1 / -0

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by the application of

A
IAA and IBA

B
Cytokinins

C
Phenyl mercuric acid

D
All of the above

Solution

Auxins like Indole acetic acid (IAA) and Indole butyric acid (IBA) have been isolated from plants. NAA (Naphthalene acetic acid) and 2,4-D (2,4 dichlorophenoxyacetic acid) are synthetic auxins. All these auxins have been used extensively in agricultural and horticultural practices. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering, e.g., in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
Question 4
1 / -0

The activity of $$\alpha$$ - amylase in endospore of barley germinating seed is induced by

A
Ethylene

B
Cytokinin

C
IAA

D
Gibberellin

Solution

The substrate for α-amylase is stored starch and the end product is free sugar, which is needed for the growth of emerging embryo. After imbibition α-amylase begins in the aleurone layer by the De novo pathway. If the embryo of the seed is removed prior to inbibition, however, no increase in α-amylase activity occurs, suggesting that a hormone or plant growth substance produced by the embryo is necessary for the synthesis of α-amylase. The plant growth hormone gibberellic acid (GA) is the messenger that triggers this response. GA is produced in the embryo and migrates to the aleurone layer, where the synthesis of α-amylase is stimulated.
Question 5
1 / -0

Cut leaves remain green for longer time if dipped in

A
Auxins

B
Cytokinins

C
Ethylene

D
Gibberellins

Solution

Cytokinins delay senescence (ageing) so chrolophyll will be retained and leaves will remain green for longer time. Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.
So, the correct answer is 'Cytokinins'
Question 6
1 / -0

choose the correctly matched pair from the following.

A
Indole butyric - used to prevent sprouting of potatoes and drooping of premature fruits.

B
Ethephon - Used to increase latex production in rubber

C
Naphthalene acetic acid - Used to sprout root on stem and to induce fruiting

D
2, 4-D - Used to prevent early flowering and ripening of fruits.

Solution

Etheophon is an ethylene releaser which will increase latex production in rubber. Ethylene is the only plant hormone which will increase latex production and is used in the form of Etheophon.
So the correct option is 'Ethephon - Used to increase latex production in rubber.'
Question 7
1 / -0

If a horticulturist used gibberellins in a dwarf plant during its vegetative growth phase, then which of the following are correct?
A. It results excess growth of stem resulting tall and vine like plant.
B. It a effects only the physical feature, but not changing its genetic nature.
C. The next generation obtained from such a modified plant will be of tall and vine like.
D. It includes early maturation of fruits.

A
C and D

B
A and B

C
A and C

D
B and D

Solution

The offsprings produced by gibberellins, they don't show tall and vine-like and gibberellins don't show early maturation of fruits.
So the correct option is 'A and B'.
Question 8
1 / -0

Agent orange is a herbicide that contains synthetic

A
Auxin

B
Cytokinin

C
Gibberellins

D
Pigments

Solution

When the auxins are present in higher concentration, they inhibit growth and are toxic to the plants. The mixture of two auxins, 2,4-D and 2,4,5-T are known as agent orange. It is a dioxin weedicide. This weedicide was used by the U.S military in the Vietnam war to remove the forest cover which was used for hiding by the soldiers.
Thus, the correct answer is option A.
Question 9
1 / -0

The most widely using artificial plant hormone for controlling weed is

A
NAA

B
2,4-D

C
IBA

D
Ethylene

Solution

2, 4-dichlorophenoxyacetic (2, 4-D) is a synthetic auxin used to kill dicotyledonous weeds. Naphthalene acetic acid (NAA) is also a synthetic auxin but is not used to control weeds.
So, the correct answer is, '2, 4-D'.
Question 10
1 / -0

Which of the following can retard the ageing of plant organs?

A
Auxin

B
Ethylene

C
Cytokinin

D
None of the above.

Solution

Cytokinins are a group of plant hormones, including kinetin, which acts synergetically with auxins to promote cell division.
Cytokinins can retard ageing of plant organs by controlling protein synthesis and mobilization of resources. Cut leaves dipped in cytokinins stay green longer than the control leaves.
Thus, the correct answer is option (C), 'Cytokinin'.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 81

Result

Plant Growth and Development Test - 81

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SHARING IS CARING

Question 1

Auxin

Mixture of auxin and gibberellin

Mixture of auxin and cytokinin

Mixture of cytokinin and gibberellin

Solution

Question 2

Inhibit cytopasmic movement

Help in retention of chlorophyll

Influence water movement

Promote adscission layer formation

Solution

Question 3

IAA and IBA

Cytokinins

Phenyl mercuric acid

All of the above

Solution

Question 4

Ethylene

Cytokinin

IAA

Gibberellin

Solution

Question 5

Auxins

Cytokinins

Ethylene

Gibberellins

Solution

Question 6

Indole butyric - used to prevent sprouting of potatoes and drooping of premature fruits.

Ethephon - Used to increase latex production in rubber

Naphthalene acetic acid - Used to sprout root on stem and to induce fruiting

2, 4-D - Used to prevent early flowering and ripening of fruits.

Solution

Question 7

C and D

A and B

A and C

B and D

Solution

Question 8

Auxin

Cytokinin

Gibberellins

Pigments

Solution

Question 9

NAA

2,4-D

IBA

Ethylene

Solution

Question 10

Auxin

Ethylene

Cytokinin

None of the above.

Solution

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