Plant Growth and Development Test

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Plant Growth and Development Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

The chief role of CK is

A
To check abscission

B
To check senescence

C
To mobilize solutes

D
To check senescence and to mobilize solutes from one part to other

Solution

Cytokinin hormone does the major function of checking senescence and mobilising solutes from one part to another. It promotes the cell division or cytokinesis, in plant roots and shoots.
So, the correct answer is option D.
Question 2
1 / -0

Which of the following contains cytokinin?

A
Coconut milk

B
Young kernels of maize

C
Fruit of cucurbits

D
Both (A) and (B)

Solution

Coconut milk and young kernels of maize contains cytokinin. Cytokinis are a class of plant growth substances that promote cell division, or cytokinesis in plant roots and shoots. It is an adenine derivative.
Question 3
1 / -0

Which one of the following is a kinetin?

A
Indole-3-pyruvic acid

B
Ethyl Indoleacetate

C
6-Furfurylamino purine

D
Acetyl $${GA_3}$$

Solution

6-Furfurylamino purine is a form of kinetin. Where kinetin is a type of cytokinin, a class of plant hormones that promotes cell division. Kinetin was originally isolated by Miller and Skoog et al., as a compound from autoclaved herring sperm DNA that has cell division-promoting activity.
Question 4
1 / -0

Biosynthesis of gibberellin is inhibited by

A
AMO-1618 and cyocel

B
Cytokinin

C
Auxin

D
All of the above

Solution

Gibberellins are growth hormones. They stimulate cell elongation, thus help in plant growth. But certain commercial chemicals like AMO-1618 and cyocel are used to stunt growth. The chemicals inhibit the biosynthesis of gibberellin by blocking the pathway of gibberellin synthesis.
So, the correct answer is 'AMO-1618 and cyocel'.
Question 5
1 / -0

The following experiment was performed to test the effect of auxin on plant growth: Study and answer question.

The auxin was dissolved in a gelatin block; gelatin does not affect the biological activity of the auxin. Several plant seedlings were prepared in a gelatin block; gelatin does not affect the biological, activity of the auxin. Several plant seedlings were prepared as described above and growth was measured every 5 days.

Based on the results of the experiment, one can conclude that the tip of the plant contains ....................

Which of the following plants in the experiment acted as a control?
Plant 1, Plants 2 and 3, Plant 5

A
I only

B
II only

C
III only

D
I and II only

E
All (A), (B) and (C) except (D)

Solution

From the given figure, second one is a control plant. It is because, in plant 2 tip of the plant is removed and nothing is applied. All other plants exhibit the expression of auxin except the control plant.
Question 6
1 / -0

The following experiment was performed to test the effect of auxin on plant growth: Study and answer question.

The auxin was dissolved in a gelatin block; gelatin does not affect the biological activity of the auxin. Several plant seedlings were prepared in a gelatin block; gelatin does not affect the biological, activity of the auxin. Several plant seedlings were prepared as described above and growth was measured every 5 days.

Based on the results of the experiment, one can conclude that the tip of the plant contains ....................

What proves that auxin is necessary for plant growth?

A
Plant 1 grew faster than plants 2 or 3

B
Plant 4 grew faster than plants 2 or 3

C
Plant 5 grew faster than plant 1

D
Plant 3 grew faster than plant 2

E
Plant 4 grew faster than plant 5

Solution

In the given picture, plant 4 will grow faster because tip is removed and auxin with gelatin is applied. This makes the plant to divide its cells mitotically. Multiplication of meristem cells are random and results in apical dominance. Thus, it grows faster than plants 2 or 3.
Question 7
1 / -0

Differentiation of shoot is controlled by ..................

A
High auxin: cytokinin ratio

B
High cytokinin: auxin ratio

C
High gibberellin : auxin ratio

D
High gibberellin : cytokinin ratio.

Solution

A high cytokinin to auxin ratio triggers shoot formation but inhibits root induction, whereas, a low ratio produces the opposite effect. Plant growth regulators (cytokinin, auxin) are widely used to control differentiation in cultured plant cells and tissues.
Question 8
1 / -0

Synthetic auxins are used for ..................

A
Killing weeds

B
Ripening fruits

C
Increasing the size of the fruits

D
Stimulating growth of shoot cells in tissue culture

E
Preventing elongation of internodes

Solution

Synthetic auxins like 2,4-dichlorophenoxy acetic acid and 2,4,5-trichlorophenoxy acetic acid act as weedicide. These herbicides generally mimic auxin. They are often called growth regulators because they upset the natural hormone balance in the plant. The synthetic auxins are used primarily to control broadleaf weeds in grass weeds in grass crops, pastures and turf. These include 2,4-dichloropweeds in grass crops, pastures, and turf.
Question 9
1 / -0

The following experiment was performed to test the effect of auxin on plant growth: Study and answer question.

The auxin was dissolved in a gelatin block; gelatin does not affect the biological activity of the auxin. Several plant seedlings were prepared in a gelatin block; gelatin does not affect the biological, activity of the auxin. Several plant seedlings were prepared as described above and growth was measured every 5 days.

Based on the results of the experiment, one can conclude that the tip of the plant contains ....................

A
Gelatin

B
Paste

C
Auxin

D
None of these

Solution

Based on the results of this experiment, it can be easily concluded that the phytohormone involved is auxin. It is the first hormone in plants, well studied. Auxin causes apical dominance, that is it results in the increase of apical length of stem.
Question 10
1 / -0

Carrot root phloem bioassay is a device for

A
Auxin

B
ABA

C
Wound hormone

D
Cytokinin

Solution

Carrot root phloem assay is the bioassay for cytokinin. Cytokinins are a class of plant growth substances that promote cell division or cytokinesis in plant roots and shoots. This technique tells us about increase in cell number after cell division as it measures the growth response. This test is sensitive to amounts as low as ten- millionth of a gram of cytokinin per litre of medium.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 29

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Plant Growth and Development Test - 29

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SHARING IS CARING

Question 1

To check abscission

To check senescence

To mobilize solutes

To check senescence and to mobilize solutes from one part to other

Solution

Question 2

Coconut milk

Young kernels of maize

Fruit of cucurbits

Both (A) and (B)

Solution

Question 3

Indole-3-pyruvic acid

Ethyl Indoleacetate

6-Furfurylamino purine

Acetyl $${GA_3}$$

Solution

Question 4

AMO-1618 and cyocel

Cytokinin

Auxin

All of the above

Solution

Question 5

I only

II only

III only

I and II only

All (A), (B) and (C) except (D)

Solution

Question 6

Plant 1 grew faster than plants 2 or 3

Plant 4 grew faster than plants 2 or 3

Plant 5 grew faster than plant 1

Plant 3 grew faster than plant 2

Plant 4 grew faster than plant 5

Solution

Question 7

High auxin: cytokinin ratio

High cytokinin: auxin ratio

High gibberellin : auxin ratio

High gibberellin : cytokinin ratio.

Solution

Question 8

Killing weeds

Ripening fruits

Increasing the size of the fruits

Stimulating growth of shoot cells in tissue culture

Preventing elongation of internodes

Solution

Question 9

Gelatin

Paste

Auxin

None of these

Solution

Question 10

Auxin

ABA

Wound hormone

Cytokinin

Solution

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