Plant Growth and Development Test

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Plant Growth and Development Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

A natural growth regulator is

A
2, 4-D

B
Benzaldehyde

C
NAA

D
Ethylene

Solution

A 2 ,4-D is an synthetic type of auxin, a plant hormone. It acts as weedicide as it kills weeds. Benzaldehyde is a synthetic growth regulator. It acts as pesticide. NAA is a synthetic type of auxin, a plant hormone. It acts as synthetic growth regulator. It acts as rooting agent. Ethylene is a gaseous plant hormone. It acts as natural growth regulator. It hastens the ripening of fruits.
Thus, the correct answer is option D.
Question 2
1 / -0

The characteristics like expansion, breaking dormancy, promoting germination and flowering are associated with

A
Auxins

B
Gibberellins

C
Cytokinins

D
Ethylene

Solution

Gibberellin is a plant hormone that is involved in various physiological processes of plants. It acts as plant growth regulator. It is involved in various processes like stem elongation, germination, flowering and leaf senescence. It breaks the seed dormancy and promotes germination. Flowering requires either long day or cold temperature. However, gibberellin induces flowering under normal condition.
Thus, the correct answer is option B.
Question 3
1 / -0

Abscisic acid is called stress hormone as it

A
Induces flowering

B
Breaks seed dormancy

C
Promotes leaf fall

D
Promotes stomatal closure

Solution

Abscisic acid is a plant hormone. It is also called as stress hormone as under stress environmental condition, it induces seed dormancy. It promotes stomatal closure under water stress condition to decrease the rate of transpiration.
Thus, the correct answer is option D.
Question 4
1 / -0

Spraying sugarcane crop with a plant hormone increases length of plants and increases yield by as much as $$20$$ tonnes/acre. The hormone is

A
Gibberellin

B
Auxin

C
Cytokinin

D
ABA

Solution

Gibberellin is a plant hormone that produces various physiological responses in the plants. It stimulates stem elongation, flowering, germination. Due to their ability to increase the length of stem, it is used to increase the length of sugarcane stem. Sugarcane stem contains carbohydrate and yields are also increased.
Thus, the correct answer is option A.
Question 5
1 / -0

Match the columns and choose the correct option.
I II
(p) Control of weeds (i) Gibberellin
(q) Induction of germination (ii) Cytokinin
(r) Ripening of fruit (iii) 2, 4-D
(s) Delaying of senescence (iv) Ethylene

A
p - ii, q - iv, r - iii, s - i

B
p - iii, q - i, r - iv, s - ii

C
p - i, q - ii, r - iv, s - iii

D
p - ii, q - iii, r - i, s - iv

Solution

Ethylene is a plant hormone. It is also called as ripening hormone as it induces ripening of fruits in plants. Gibberellin is a plant hormone. It induces stem elongation, flowering, and germination. A 2, 4-D is a synthetic auxin hormone. It is called as weedicide as it kills the weeds. Cytokinin is a plant hormone. It induces cell division or cytokinesis. It delays the senescence of leaves.
Thus, the correct answer is option B.
Question 6
1 / -0

Which of the following plant hormones reduces transpiration rate by inducing stomatal closure

A
Ethylene

B
Gibberellin

C
ABA

D
Cytokinin

Solution

ABA (abscisic acid) is a plant hormone. It is also called as stress hormone as its concentration increases during stress condition. During adverse environmental conditions like drought, it induces stomatal closure. This results in reduced transpiration rate during water stress condition.
Thus, the correct answer is option C.
Question 7
1 / -0

Length of stalks of grape fruits increases due to

A
Auxin

B
Cytokinins

C
Ethylene

D
Gibberellin

Solution

Gibberellin is a plant hormone that produces various physiological responses in the plants. It stimulates stem elongation, flowering, germination. Due to their ability to increase the length of stem, it is used to increase the length of stalks of grape fruits.
Thus, the correct answer is option D.
Question 8
1 / -0

Cytokinin is not found in

A
Root apex

B
Shoot apex

C
Young fruits

D
Mature fruits

Solution

Cytokinin is a plant hormone that promotes cell division in root apex, shoot apex and young fruits. It is also involved in apical dominance and leaf senescence. They are not found in mature fruits.
Thus, the correct answer is option D.
Question 9
1 / -0

Which of the following is the effect of a plant hormone, which is synthesised more in absence of light?

A
Inhibits the development of seedless fruits

B
Responsible for closing of stomata

C
Induces the dormancy of seeds

D
Length of intenodes increases

Solution

Gibberellins are the plant hormone causing light inhibited stem growth, this shows that light lowers the level of endogenous gibberellins and stem growth, while in dark it reverses. Gibberellins also produce some other physiological effects on plants like elongation of internodes and the stem, induce seed germination, breaking dormancy, induce parthenocarpy and maleness in plants, etc. Thus the correct answer is option D.
Question 10
1 / -0

One hormone stimulates the closure of stomata and another one influences the swelling of the axis in dicot plants. They are

A
Gibberellins and ethylene

B
Abscisic acid and cytokinins

C
Gibberellins and cytokinins

D
Auxins and cytokinins

E
Abscisic acid and ethylene

Solution

Abscisic acid is a plant hormone. It is also called as a stress hormone. During adverse environmental conditions, it's concentration increases. During water stress condition, it stimulates closure of stomata and hence decreases transpiration rate. Ethylene is also a plant hormone. It shows the triple response. It influences the horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot plants.
Thus, the correct answer is option E.

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Re-Attempt Weekly Quiz Competition

I	II
(p) Control of weeds	(i) Gibberellin
(q) Induction of germination	(ii) Cytokinin
(r) Ripening of fruit	(iii) 2, 4-D
(s) Delaying of senescence	(iv) Ethylene

Plant Growth and Development Test - 65

Result

Plant Growth and Development Test - 65

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Rank

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SHARING IS CARING

Question 1

2, 4-D

Benzaldehyde

NAA

Ethylene

Solution

Question 2

Auxins

Gibberellins

Cytokinins

Ethylene

Solution

Question 3

Induces flowering

Breaks seed dormancy

Promotes leaf fall

Promotes stomatal closure

Solution

Question 4

Gibberellin

Auxin

Cytokinin

ABA

Solution

Question 5

p - ii, q - iv, r - iii, s - i

p - iii, q - i, r - iv, s - ii

p - i, q - ii, r - iv, s - iii

p - ii, q - iii, r - i, s - iv

Solution

Question 6

Ethylene

Gibberellin

ABA

Cytokinin

Solution

Question 7

Auxin

Cytokinins

Ethylene

Gibberellin

Solution

Question 8

Root apex

Shoot apex

Young fruits

Mature fruits

Solution

Question 9

Inhibits the development of seedless fruits

Responsible for closing of stomata

Induces the dormancy of seeds

Length of intenodes increases

Solution

Question 10

Gibberellins and ethylene

Abscisic acid and cytokinins

Gibberellins and cytokinins

Auxins and cytokinins

Abscisic acid and ethylene

Solution

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