Plant Growth and Development Test

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Plant Growth and Development Test - 87

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Weekly Quiz Competition

Question 1
1 / -0

Find the correct statements.
1. Causal organism of foolish seedling disease is source of gibberellin
2. Ascorbic acid is growth promoter
3. Ratio of auxin to cytokinin controls differentiation
4. Bolting of cabbage can be induced by treatment with IAA

A
1, 2, 3 correct

B
1, 2 correct

C
2, 4 correct

D
1, 3 correct

Solution

Foolish seedling disease affects the rice plant through the roots or crowns. It is caused by the fungus Gibberella fujikuroi. Hence, it is source of gibberellin hormone. Ascorbic acid acts as growth promoter in plants. Ratio of auxin to cytokinin controls differentiation. High ratio of auxin to cytokinin induces shoot regeneration and low ratio induces root regeneration. Bolting is the process of premature flowering. It is induced artificially in cabbage by treatment of gibberellin under normal condition.
Thus, the correct answer is option A.
Question 2
1 / -0

Which one is derivative of a carotenoid?

A
IAA

B
ABA

C
IBA

D
GA

Solution

Abscisic acid is plant hormone. It is terpenoid chemically, that is derivative of carotenoid. It stimulates seed dormancy in plants. Carotenoids are also called as tetraterpenoids.
Thus, the correct answer is option B.
Question 3
1 / -0

6-furfuryl amino purine, 2, 4-dichlorophenoxy acetic acid and indole 3-acetic acid are

A
Synthetic auxin, kinetin and natural auxin

B
Gibberellin, natural auxin and kinetin

C
Natural auxin, kinetin and synthetic auxin

D
Kinetin, synthetic auxin and natural auxin

E
Natural auxin, gibberellin and kinetin

Solution

Kinetin is also called as 6-furfuryl amino purine. It is a type of cytokinin hormone. A 2,4-dichlorophenoxyacetic acid is also called as 2,4-D. It is a synthetic auxin hormone which acts as weedicide. Indole-3-acetic acid is also called as IAA. It is a most common naturally found auxin hormone in plants.
Thus, the correct answer is option D.
Question 4
1 / -0

Auxin develops at the tip of the stem. Its movement is largely

A
Acropetal

B
Centropetal

C
Basipetal

D
Acropetal and basipetal

Solution

Auxin is a plant hormone that is involved in various physiological processes. It promotes cell elongation. Hence, it is mostly produced in the meristematic region of the stem. It is also present on the tip of roots and buds. In stems, the movement of auxin is basipetal, that is movement is from apex towards the base. In roots the auxin transport is acropetal.
Thus, the correct answer is option C.
Question 5
1 / -0

Natural plant hormone isolated from corn kernels and coconut milk is

A
Florigen

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

C
Free auxins

D
Zeatin

E
IAA

Solution

Kinetin is a type of cytokinin which is a plant hormone. It promotes cell division. The first known cytokinin hormone was found in coconut milk. It stimulates the embryo to grow when it is supplied with food. Zeatin is the most common type of cytokinin hormone isolated from corn kernels.
Thus, the correct answer is 'Zeatin'.
Question 6
1 / -0

One of the commonly used plant growth hormone in tea plantation is

A
Zeatin

B
ABA

C
IAA

D
Ethylene

Solution

Auxin is a plant hormone. IAA is a type of auxin present in the plant. It promotes growth in plants. It stimulates cell elongation. It is commonly used in stem cutting. In tea plantation, cutting is done which is followed by vegetative propagation. The cutting produces new roots and stems. The new plant thus produced is independent of the parent.
Thus, the correct answer is option C.
Question 7
1 / -0

Natural hormone isolated from coconut milk and corn kernels is

A
Florigen

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

C
Auxins

D
Zeatin

Solution

Zeatin is a type of cytokinin, a plant hormone. It stimulates cell division. It is present in coconut milk. It was first isolated from Zea maize (corn kernels). It stimulates growth in plants.
Thus, the correct answer is option D.
Question 8
1 / -0

Find the correct combination.
(A) DCMU...........Herbicide...........Inhibitor of non-cyclic electron transport
(B) PMA..........Fungicide...............Reduces transpiration
(C) Colchicine...........Alkaloid..............Causes male sterility
(D) Solnite-Sodium alginate..........Encapsulation of somatic embryos.

A
$$a, b$$

B
$$a, c$$

C
$$b, c$$

D
$$b, d$$

Solution

DCMU (dichlorophenyl)-1,1-dimethylurea) is a herbicide which kills algae and hence inhibits photosynthesis. It acts by inhibiting non-cyclic electron transport system. It has no effect on cyclic electron transport system. PMA (Phenylmercuric acetate) is a fungicide. It acts as antitranspirants by closing the stomata. It reduces transpiration rate. Colchicine is an alkaloid. It causes male infertility and not sterility. Encapsulation of somatic embryos is done by using sodium alginate and calcium chloride.
Thus, the correct answer is 'a,b'.
Question 9
1 / -0

Discovery of gibberellin is related to

A
Blast disease of Rice

B
Early blight of Potato

C
Bakane disease of Rice

D
Rust of Wheat

Solution

Bakanae disease is also called as foolish seedling disease. It affects the rice plant through the roots or crowns. It is caused by the fungus Gibberella fujikuroi. Affected seedlings show abnormal elongation and in severe cases may lead to death.
Thus, the correct answer is option C.
Question 10
1 / -0

Rosette habit of cabbage can be changed by the application of

A
ABA

B
IAA

C
GA

D
Ethephon

Solution

Cabbage is a rosette plant. The rosette habit of cabbage can be changed drastically by the application of gibberellic acid. GA is a plant hormone which helps in longitudinal growth of the stem. The rapid stem elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. However, bolting can be induced artificially by the application of gibberellic acid under normal conditions.
Thus, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 87

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Plant Growth and Development Test - 87

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SHARING IS CARING

Question 1

1, 2, 3 correct

1, 2 correct

2, 4 correct

1, 3 correct

Solution

Question 2

IAA

ABA

IBA

GA

Solution

Question 3

Synthetic auxin, kinetin and natural auxin

Gibberellin, natural auxin and kinetin

Natural auxin, kinetin and synthetic auxin

Kinetin, synthetic auxin and natural auxin

Natural auxin, gibberellin and kinetin

Solution

Question 4

Acropetal

Centropetal

Basipetal

Acropetal and basipetal

Solution

Question 5

Florigen

$${GA}_{3}$$

Free auxins

Zeatin

IAA

Solution

Question 6

Zeatin

ABA

IAA

Ethylene

Solution

Question 7

Florigen

$${GA}_{3}$$

Auxins

Zeatin

Solution

Question 8

$$a, b$$

$$a, c$$

$$b, c$$

$$b, d$$

Solution

Question 9

Blast disease of Rice

Early blight of Potato

Bakane disease of Rice

Rust of Wheat

Solution

Question 10

ABA

IAA

GA

Ethephon

Solution

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