Plant Growth and Development Test

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Plant Growth and Development Test - 63

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Question 1
1 / -0

Which is not a function of cytokinin?

A
Delay is senescence

B
Breaking seed dormancy

C
Promoting bud dormancy

D
Promoting stomatal opening

Solution

Cytokinin (CK) is a plant hormone. It promotes cell division and delays senescence in plants. It improves nutrient mobilization and thus delays leaf senescence. When applied externally, it mobilizes nutrients towards sites of application. It also promotes stomatal opening along with auxin hormone. It also breaks the dormancy of seeds and induce seed germination.
Thus, the correct answer is option C.
Question 2
1 / -0

Which statements are correct?
$$a$$ - Cytokinins suppress the synthesis of chlorophyll
$$b$$ - Auxins control apical dominance
$$c$$ - Gibberellins promote shoot elongation
$$d$$ - Abscisic acid enables seeds to with-stand desication.

A
$$a$$ and $$b$$ only

B
$$b$$ and $$c$$ only

C
$$a$$ and $$c$$ only

D
$$b$$, $$c$$ and $$d$$ only

E
$$c$$ and $$d$$ only

Solution

Cytokinin is a plant hormone that promotes cell division. It also delays the destruction of chlorophyll and protein. Gibberellin is a plant hormone that is involved in various plant processes like shoot elongation, germination, dormancy, leaf and fruit senescence. Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones auxin produced in the tip of the shoot. Abscisic acid is a stress hormone. It helps seeds to withstand adverse environmental conditions such as desiccation, drought.
Thus, the correct answer is option D.
Question 3
1 / -0

Avena curvature test is bioassay for activity of

A
Auxin

B
Ethylene

C
Cytokinin

D
Gibberellin

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 the plant such as Avena coleoptile curvature test, split pea stem curvature test, cress root inhibition test. The Avena curvature test is a bioassay for auxin 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 'Auxin'.
Question 4
1 / -0

Leaf fall occurs in a tree when there is increase in concentration of

A
Gibberellin

B
Cytokinin

C
Auxin

D
ethylene

Solution

Abscisic acid is a plant hormone. It is involved in various physiological processes of plant. It promotes abscission of leaves and hence the name given. Its concentration increases as plant ages and ultimately results in the leaf fall. It is involved in the ageing process of plant.
Thus, the correct answer is option D.
Question 5
1 / -0

Induction of cell division and delay in senescence are due to

A
Gibberellin

B
Auxin

C
Cytokinin

D
Ethylene

Solution

Cytokinin is a plant hormone. It plays major role in cell proliferation and cell division. It also delays the destruction of chlorophyll and protein. During senescence, cytokinin levels are low. It delays in senescence of leaves when sprayed externally by delaying the destruction of chlorophyll and proteins in leaves
So, the correct answer is 'Cytokinin'
Question 6
1 / -0

$$\alpha$$-amylase synthesis is promoted by

A
IAA

B
GA

C
Cytokinin

D
NAA

Solution

Gibberellic acid is a plant hormone which breaks the dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of amylase enzyme in the aleurone cells of certain cereals. Amylase hydrolyses starch into glucose which is used to provide nourishment to the seed embryo.
Thus, the correct answer is option A.
Question 7
1 / -0

Period between formative phase and maturation phase of plant growth is

A
Lag phase

B
Phase of elongation

C
Stationary phase

D
Grand period of growth

Solution

In plants, the growth is divided into three main phases, namely phase of cell division, cell elongation and cell maturation. The phase of cell division is called as formative phase. The second phase is phase of elongation. In this, cell enlargement and cell differentiation takes place. The last phase is maturation phase. In this, cell differentiate into distinct type of cells and tissues.
Thus, the correct answer is option B.
Question 8
1 / -0

IAA helps in formation of

A
Stem

B
Root

C
Fruit

D
Lateral buds

Solution

Auxin is a plant hormone. It is involved in fruit development. It stimulates fruit growth and development and delays fruit senescence. IAA, a type of auxin helps flowering, fruit formation and ripening of the fruits.
Thus, the correct answer is option C.
Question 9
1 / -0

Which hormone is not translocated?

A
Auxin

B
Gibberellins

C
ABA

D
Cytokinin

E
Ethylene

Solution

Cytokinin is synthesized in the root and is translocated from roots to shoots via xylem. Auxin is synthesized in the stem tip and is translocated via parenchyma cells to different sites. Gibberellin is translocated via phloem and xylem. Abscisic acid is translocated through vascular tissue and activated diffusion. Ethylene is diffused through intracellular spaces throughout the plant as it is gaseous in nature.
Thus, the correct answer is option E.
Question 10
1 / -0

Transport of cytokinin in the plant body is

A
Basipetal

B
Lateral

C
Acropetal

D
On all sides

Solution

Cytokinin is a plant hormone that is synthesized in the root. It shows acropetal transport. It is exactly opposite to the basipetal transport of auxin hormone. Acropetal transport is the translocation of hormone towards the shoot apex.
Thus, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 63

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Plant Growth and Development Test - 63

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SHARING IS CARING

Question 1

Delay is senescence

Breaking seed dormancy

Promoting bud dormancy

Promoting stomatal opening

Solution

Question 2

$$a$$ and $$b$$ only

$$b$$ and $$c$$ only

$$a$$ and $$c$$ only

$$b$$, $$c$$ and $$d$$ only

$$c$$ and $$d$$ only

Solution

Question 3

Auxin

Ethylene

Cytokinin

Gibberellin

Solution

Question 4

Gibberellin

Cytokinin

Auxin

ethylene

Solution

Question 5

Gibberellin

Auxin

Cytokinin

Ethylene

Solution

Question 6

IAA

GA

Cytokinin

NAA

Solution

Question 7

Lag phase

Phase of elongation

Stationary phase

Grand period of growth

Solution

Question 8

Stem

Root

Fruit

Lateral buds

Solution

Question 9

Auxin

Gibberellins

ABA

Cytokinin

Ethylene

Solution

Question 10

Basipetal

Lateral

Acropetal

On all sides

Solution

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