Plant Growth and Development Test

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Plant Growth and Development Test - 89

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Weekly Quiz Competition

Question 1
1 / -0

Cholodony and Went effect is due to

A
IAA

B
GA

C
Cytokinin

D
ABA

Solution

Cholodony and Went effect is based on the gravitropism due to differential IAA, a type of auxin accumulation in plant. Lower side of stem has more IAA concentration. This is due to polarized transport of auxin from the upper side of cell towards the lower side.
Thus, the correct answer is option A.
Question 2
1 / -0

Two different plants associated with discovery of two different phytohormones having common biosynthetic precursor exhibit one of the following characters each
I. Versatile anthers II. Compound spadix III. Pentalocular ovary IV. Trifoliate compound leaves

A
II and III

B
I and III

C
II and IV

D
I and IV

Solution

Auxin is a phytohormone. It was discovered from the grass Phalaris. It is characterized by versatile anthers. Abscisic acid is also a phytohormone. It was discovered from cotton. It belongs to Malvaceae family which has the characteristic pentalocular ovary. Both these hormones have common biosynthetic precursor named monolonic acid.
Thus, the correct answer is option B.

Question 3

1 / -0

Match the lists and find the correct options.

I	II
a. Early seed production in conifers	i. Indole substance
b. Seed development and maturation	ii.Terpene substance
c. Lateral shoot growth	iii. Volatile substance
d. Root hair formation	iv. Adenine derivative
	v.Carotenoid derivative

a - iii, b - i, c - v, d - ii

a - ii, b - v, c - iv, d - iii

a - ii, b - i, c - v, d - iv

a - iv, b - iii, c - ii, d - i

Solution

Gibberellin is a plant hormone which is diterpene chemically. It is used to promote flowering and early seed production in conifers. Abscisic acid is a terpene chemically. It is a carotenoid derivative. It is involved in the seed development and maturation process. Adenine is a precursor of cytokinin plant hormone. Cytokinin is responsible for the growth of lateral shoot when apical dominance is inhibited due to decreased concentration of auxin hormone. Ethylene is a gaseous volatile plant hormone. Ethylene along with auxin induces root hair formation.

Thus, the correct answer is option B.

Question 4
1 / -0

Which one is growth regulator produced by plants?

A
NAA

B
Zeatin

C
2, 4-D

D
BAP

Solution

Naphthaleneacetic acid (NAA) is a type of synthetic auxin, plant hormone. It is a growth regulator. It acts as rooting agent. Zeatin a type of naturally occurring cytokinin, the plant hormone. It was first discovered in Zea maize. A 2, 4-D is a type of synthetic auxin, plant hormone. It acts as weedicide. BAP (Benzylaminopurine) is a type of synthetic cytokinin, a plant hormone. It is involved in various physiological processes of plants like cell division.
Thus, the correct answer is option B.
Question 5
1 / -0

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of a freshly cut coleoptile stumps. Of what significance is this experiment.

A
It is basis of quantitative determination of small amounts of growth promoting substances

B
It supports the hypothesis that IAA is auxin

C
It demonstrated polar movement of auxins

D
It made possible the isolation and exact identification of auxin
Solution
Correct Option: C
Explanation:
- Auxin is a plant hormone, present at the coleoptile tips, that is responsible for bending the tip towards the light.
- In the experiment, the auxin diffuses into the agar block, and then, the agar block is fixed on the cut tip.
- Despite the diffusion that has taken place, the bending occurs.
- This proves that auxins show polar movement.
Hence, the experiment demonstrated the polar movement of auxins.
Question 6
1 / -0

Identify the correct pair of combinations.
(i) Zeatin - adenine derivative - overcoming apical dominance
(ii) $${C}_{2}{H}_{4}$$ - indole compound - effective in fruit ripening
(iii) ABA - carotenoid derivative - induction of parthenocarpy
(iv) $$G{A}_{3}$$ - terpene - bolting in cabbage

A
ii, iii

B
ii, iv

C
i, iv

D
iii, iv

Solution

Gibberellin (GA$$_3$$) is a plant hormone which is diterpene chemically. Bolting is the flowering of the plant. It requires either cold condition or the long day. Gibberellin causes bolting in cabbage under normal condition. Abscisic acid is a carotenoid derivative. It stimulates seed dormancy. Auxin hormone is responsible for developing parthenocarpic fruit. Adenine is a precursor of zeatin, a type of cytokinin plant hormone. Cytokinin is responsible for the growth of lateral shoot when apical dominance is inhibited due to decreased concentration of auxin hormone. Ethylene is a gaseous plant hormone. It is a hydrocarbon which stimulates fruit ripening in plants.
Thus, the correct answer is option C.
Question 7
1 / -0

The cells derived from meristems differentiate and regain the capacity to divide by a phenomenon called

A
Differentiation

B
Dedifferentiation

C
Redifferentiation

D
Totipotency

E
Regeneration

Solution

In plants, apical meristems divide and differentiate to perform a specific function. This phenomenon is called as differentiation. Sometimes, the differentiated cells in plants regain the capacity to divide under certain conditions. This phenomenon is called as dedifferentiation. An interfascicular vascular cambium is an example of dedifferentiation. During dedifferentiation, certain cells lose the capacity to divide and becomes mature. This phenomenon is called as redifferentiation.
Thus, the correct answer is option B.
Question 8
1 / -0

Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings is brought about by

A
Auxins

B
Gibberellins

C
Ethylene

D
Kinetin

E
Abscisic acid

Solution

Ethylene is a gaseous plant hormone. It is also called as ripening hormone as it stimulates ripening of fruits. It also promotes the horizontal growth of seedlings, swelling of the axis and increase curvature by apical hook formation in dicot seedlings. It inhibits stem elongation. This is called as triple response shown by ethylene.
Thus, the correct answer is option C.
Question 9
1 / -0

Biosynthesis of cytokinin takes place via

A
Mevalonic acid cycle

B
Citric acid cycle

C
Calvin cycle

D
$${C}_{4}$$ cycle

Solution

Biosynthesis of cytokinin takes place via mevalonic acid cycle. It is also results in synthesis of gibberellic acid and abscisic acid. Mevalonic acid is first converted into isopentenyl pyrophosphate. It is then converted to isopentenyl AMP which is then converted to isopentenyl adenosine. This is finally converted to cytokinin.
Thus, the correct answer is option A.
Question 10
1 / -0

Plant hormones used for inducing morphogenesis in plant tissue culture is

A
Gibberellins

B
Ethylene

C
Cytokinins

D
ABA

Solution

Morphogenesis is the process of development of shape of an organism. Cytokinins which is present at the site where rapid cell division occurs like root apices, developing shoot buds it helps in plant growth and attaining its shape. So it will help the plant to maintain its shape in tissue culture.
So the correct option is 'Cytokinins'.

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Plant Growth and Development Test - 89

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Plant Growth and Development Test - 89

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Question 1

IAA

GA

Cytokinin

ABA

Solution

Question 2

II and III

I and III

II and IV

I and IV

Solution

Question 3

a - iii, b - i, c - v, d - ii

a - ii, b - v, c - iv, d - iii

a - ii, b - i, c - v, d - iv

a - iv, b - iii, c - ii, d - i

Solution

Question 4

NAA

Zeatin

2, 4-D

BAP

Solution

Question 5

It is basis of quantitative determination of small amounts of growth promoting substances

It supports the hypothesis that IAA is auxin

It demonstrated polar movement of auxins

It made possible the isolation and exact identification of auxin

Solution

Question 6

ii, iii

ii, iv

i, iv

iii, iv

Solution

Question 7

Differentiation

Dedifferentiation

Redifferentiation

Totipotency

Regeneration

Solution

Question 8

Auxins

Gibberellins

Ethylene

Kinetin

Abscisic acid

Solution

Question 9

Mevalonic acid cycle

Citric acid cycle

Calvin cycle

$${C}_{4}$$ cycle

Solution

Question 10

Gibberellins

Ethylene

Cytokinins

ABA

Solution

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