Plant Growth and Development Test

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Plant Growth and Development Test - 88

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following plant function is not controlled by auxins?

A
Apical dominance

B
Photosynthesis

C
Photoperiodism

D
Growth

Solution

Auxin is a plant hormone which is involved in various physiological processes of plants. It induces growth in plants. It also regulates apical dominance as it promotes stem elongation and inhibits growth of lateral buds. It is produced at the tip of stem and is involved in process of phototropism. Photoperiodism is the physiological reaction like flowering in plants that depends on the length of day and night.
Thus, the correct answer is option C.
Question 2
1 / -0

Growth hormone that speeds up malting in brewery industry is

A
Kinetin

B
Gibberellic acid

C
Auxin

D
Ethylene

Solution

Gibberellic acid is a plant hormone that is involved in various physiological processes of plants. It stimulates stem elongation, germination, flowering. It also causes fruit elongation and delays senescence. Hence, in brewery industry, it is used to speed up malting process.
Thus, the correct answer is option B.
Question 3
1 / -0

Which one is not a physiological effect of auxin?

A
Promotes bolting

B
Prevents early fruit and leaf drop

C
Promotes flowering

D
Initiates rooting in stem cuttings

E
Inhibits growth of lateral buds

Solution

Auxin is a plant hormone. It is involved in various physiological processes of the plant. It promotes apical dominance by inhibiting the growth of lateral buds. It promotes flowering in certain plants like pineapple by increasing production of ethylene. It prevents early fruit and leaf drop. However, it causes abscission of older leaves. After stem cutting, it initiates rooting.
Thus, the correct answer is option A.
Question 4
1 / -0

Find out correct options.
I II III
a Foolish plant p Volatile hormone x Induces dormancy
b Induces senescence q Abscisic acid y Ripens fruit

r Gibberella z Usually sterile plant

A
a- p- y, b- r- x

B
a- r- z, b- q- z

C
a- r- z, b- p- y

D
a- q- x, b- r- y

Solution

The foolish seedling disease affects the rice plant through the roots or crowns. It is caused by the fungus Gibberella fujikuroi. It is the source of gibberellin hormone. The plant is usually sterile. Abscisic acid is a plant hormone that induces senescence in plants. Under stress environmental condition, it induces seed dormancy.
Thus, the correct answer is option B.
Question 5
1 / -0

Cytokinins which have specific effect in cytokinesis are modified forms of

A
Cytosine

B
Adenine

C
Guanine

D
Thiamine

Solution

Cytokinin is a plant hormone. It has the specific effect in cytokinesis in plants. It is modified form of adenine. Kinetin, zeatin, and 6-benzylaminopurine are adenine type cytokinins. It is adenine molecule that is modified by the addition of 5-carbon sidechains off the 6 position.
Thus, the correct answer is option B.
Question 6
1 / -0

One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses. They are respectively

A
Auxin, gibberellin and cytokinin

B
Gibberellin, auxin, cytokinin

C
Gibberellin, auxin, ethylene

D
Gibberellin, auxin, ABA

E
Auxin, gibberellin, ABA

Solution

Gibberellin is a plant hormone that is involved in various physiological processes of plants. It is involved in stem elongation, germination, flowering and leaf senescence. It hastens the maturity period in juvenile conifers. Auxin is a plant hormone that controls xylem differentiation. Abscisic acid is a plant hormone. It is also called as stress hormone as it increases the tolerance of plants in various stress condition.
Thus, the correct answer is option D.
Question 7
1 / -0

Which is not the effect of ethylene?

A
Promotes senescence and abscission of plant organs

B
Breaks seed and bud dormancy

C
Brings about horizontal growth of seedlings

D
Hastens fruit ripening

E
Helps to overcome apical dominance

Solution

Ethylene is a plant hormone. It is also called as ripening hormone as it hastens fruit ripening in plants. In certain plants, it breaks seed and bud dormancy and induces germination. It also causes flowers to fall from the plant and hence, promotes senescence and abscission of plant hormones. It also causes the triple response in etiolated seedlings. It inhibits stem elongation and brings about the horizontal growth of seedlings.
Thus, the correct answer is option E.
Question 8
1 / -0

Match the columns and choose the correct combination.
Growth Regulator Action
$$(a)$$ Abscisic acid $$(1)$$ Delays leaf abscission
$$(b)$$ Ethylene $$(2)$$ Inhibits seed germination
$$(c)$$ Cytokinin $$(3)$$ Herbicide
$$(d)$$ Auxin $$(4)$$ Hastens fruit ripening

A
$$a - 2, b - 4, c - 1, d - 3$$

B
$$a - 1, b - 2, c - 3, d - 4$$

C
$$a - 2, b - 3, c - 4, d - 1$$

D
$$a - 2, b - 1, c - 3, d - 4$$

E
$$a - 3, b - 4, c - 1, d - 2$$

Solution

Abscisic acid is a plant hormone. It is also called as stress hormone as its concentration increases during stress condition. During unfavorable environmental condition, it inhibits seed germination and induces seed dormancy. Ethylene is a plant hormone. It is also called as ripening hormone as it hastens fruit ripening in plants. Cytokinin is a plant hormone that induces cell division. It delays the abscission of leaves. A 2, 4-D is a synthetic auxin, a plant hormone. It acts as herbicide as it kills weeds.
Thus, the correct answer is 'a−2,b−4,c−1,d−3'.
Question 9
1 / -0

During seed germination, its stored food is mobilised by

A
Gibberellin

B
Ethylene

C
Cytokinin

D
ABA

Solution

Gibberellin is a plant hormone that is involved in various physiological processes of plant. It causes stem elongation, flowering, germination. During seed germination, it promotes aleurone cells to secrete enzyme which breakdowns and mobilizes food stored in seed.
So, the correct answer is 'Gibberellin'
Question 10
1 / -0

The hormone that promotes rapid elongation of intermodes or leaf base in deep water rice plant is

A
Abscisic acid

B
Ethylene

C
Cytokinin

D
Gibberellin

Solution

Gibberellin is a plant hormone which is involved in various developmental processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. It helps in process of bolting. Bolting is a rapid stem elongation of plant. It also promotes rapid elongation of the internodes of leaf base in such a way that dwarf plants overcome the genetic dwarfism.
Thus, the correct answer is option D.

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	I		II		III
a	Foolish plant	p	Volatile hormone	x	Induces dormancy
b	Induces senescence	q	Abscisic acid	y	Ripens fruit
		r	Gibberella	z	Usually sterile plant

	Growth Regulator		Action
$$(a)$$	Abscisic acid	$$(1)$$	Delays leaf abscission
$$(b)$$	Ethylene	$$(2)$$	Inhibits seed germination
$$(c)$$	Cytokinin	$$(3)$$	Herbicide
$$(d)$$	Auxin	$$(4)$$	Hastens fruit ripening

Plant Growth and Development Test - 88

Result

Plant Growth and Development Test - 88

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Question 1

Apical dominance

Photosynthesis

Photoperiodism

Growth

Solution

Question 2

Kinetin

Gibberellic acid

Auxin

Ethylene

Solution

Question 3

Promotes bolting

Prevents early fruit and leaf drop

Promotes flowering

Initiates rooting in stem cuttings

Inhibits growth of lateral buds

Solution

Question 4

a- p- y, b- r- x

a- r- z, b- q- z

a- r- z, b- p- y

a- q- x, b- r- y

Solution

Question 5

Cytosine

Adenine

Guanine

Thiamine

Solution

Question 6

Auxin, gibberellin and cytokinin

Gibberellin, auxin, cytokinin

Gibberellin, auxin, ethylene

Gibberellin, auxin, ABA

Auxin, gibberellin, ABA

Solution

Question 7

Promotes senescence and abscission of plant organs

Breaks seed and bud dormancy

Brings about horizontal growth of seedlings

Hastens fruit ripening

Helps to overcome apical dominance

Solution

Question 8

$$a - 2, b - 4, c - 1, d - 3$$

$$a - 1, b - 2, c - 3, d - 4$$

$$a - 2, b - 3, c - 4, d - 1$$

$$a - 2, b - 1, c - 3, d - 4$$

$$a - 3, b - 4, c - 1, d - 2$$

Solution

Question 9

Gibberellin

Ethylene

Cytokinin

ABA

Solution

Question 10

Abscisic acid

Ethylene

Cytokinin

Gibberellin

Solution

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