Plant Growth and Development Test

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Plant Growth and Development Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following movements is not related to change in auxin levels?

A
Nyctinastic leaf movement

B
Movement of roots towards soil

C
Movements of sunflower tracking the direction of the sun

D
Movement of shoot towards light

Solution

Auxin is a growth hormone which is mainly responsible for phototropic movement while nyctinasty is the circadian rhythmic nastic movement of higher plants in response to the onset of darkness. Examples are the closing of the petals of a flower at dusk and the sleep movements of the leaves of many legumes.
So, the correct answer is option A.
Question 2
1 / -0

Highest concentration of auxins exist ...........

A
At the base of various plant organs

B
At growing tip of plants

C
In leaves

D
In xylem and phloem cell only

Solution

Highest concentration of auxins are found at the tips of plants. Auxin causes apical dominance, elongating the plant shoot tip and thus the plant grows tall.
Question 3
1 / -0

The primary precursor of IAA is

A
Phenyl alanine

B
Tyrosine

C
Tryptophan

D
Leucine

Solution

Auxin is a growth hormone which shows a great response towards phototropism. It is naturally found in growing tips of root and shoot. It is responsible for cell growth, cell division and cell expansion. Tryptophan is the precursor of auxin.
So, the correct answer is option C.
Question 4
1 / -0

Parthenocarpy is induced by _______.

A
ABA

B
Auxins

C
Zeatin

D
Cytokinin

Solution

Parthenocarpy is the natural or artificially induced production of fruit without fertilization of ovules. The fruit will thus become seedless. In presence of auxins unfertilized ovary get changed into fruit. Auxin mainly helps in cell division, expansion and its growth.
So, the correct answer is option B.
Question 5
1 / -0

Which one of the following is considered as synthetic auxin?

A
NAA

B
IAA

C
GA

D
None of the above

Solution

NAA is synthetic auxin. It is an organic compound and plant hormone. NAA stands for 1 - naphthaleneacetic acid. Other examples for synthetic auxins are IBA, 2, 4 - D, etc.
Question 6
1 / -0

Which one of the following hormones is not found in plants?

A
2,4 - D

B
IAA

C
Gibberellin

D
None of the above

Solution

2,4-D is a synthetic auxin hormone. It is not naturally present in plants. It has profound applications as weedicide as well as pesticide in plants. There are several other synthetic auxins like IBA, and so on.
Question 7
1 / -0

6-furfuryl amino purine, 2,4-dichlorophenoxy acetic acid and indole-3-acetic acid are examples respectively for

A
Synthetic auxin, kinetin and natural auxin

B
Gibberellin, natural auxin and kinetin

C
Natural auxin, kinetin and synthetic auxin

D
Kinetin, synthetic auxin and natural auxin

E
Natural auxin, gibberellin and kinetin

Solution

Plant hormones are required for proper growth and development. Kinetin is otherwise called as 6-furfuryl amino purine. 2, 4 - D is a kind of synthetic auxin which is used as weedicide as well as herbicide. Indole - 3 - acetic acid is natural auxin.
So, the correct answer is option D.
Question 8
1 / -0

Auxin in plant is not meant for ................

A
Cell elongation

B
Fruit ripening

C
Cell division

D
Inhibit the root growth

Solution

Auxin is a prominent plant hormone which has very important role to play in cell elongation, division, root growth inhibition, apical dominance, phototropic movement, etc. Whereas ethylene is the gas responsible for the ripening of fruits.
Question 9
1 / -0

Pruning of plants promotes branching because the axillary buds get sensitized to

A
Ethylene

B
Gibberellin

C
Cytokinin

D
Indole acetic acid

Solution

Indole acetic acid, which is a type of auxin is well known to exhibit apical dominance. Apical dominance is the growth of the shoot tip of the plant, which makes the plant to grow tall. This inhibits the growth towards sides. When the plant is pruned, the axillary buds are accelerated and results in the sidewards growth of plant.
Question 10
1 / -0

Levitt performed experiments. He observed that auxin treated cells were able to absorb water even when kept in hypertonic solution. Which explains this observation best?

A
Auxin treated cells lose selective permeability

B
ATP production increases and therefore much energy is available for active absorption

C
Auxin lowers the water potential of cells

D
None of the above

Solution

Levitt conducted several experiments on water absorption in potato. The auxin-induced water uptake by potato has been attributed to active water absorption. From the results, obtained by Levitt, first condition - A completely reversible increase in stretch of the cell wall would be accompanied by increasing water potential and therefore less and less water would be actively absorbed and the steady state would be soon reached. It is because auxin lowers the water potential of cells.
So, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 16

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Plant Growth and Development Test - 16

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Question 1

Nyctinastic leaf movement

Movement of roots towards soil

Movements of sunflower tracking the direction of the sun

Movement of shoot towards light

Solution

Question 2

At the base of various plant organs

At growing tip of plants

In leaves

In xylem and phloem cell only

Solution

Question 3

Phenyl alanine

Tyrosine

Tryptophan

Leucine

Solution

Question 4

ABA

Auxins

Zeatin

Cytokinin

Solution

Question 5

NAA

IAA

GA

None of the above

Solution

Question 6

2,4 - D

IAA

Gibberellin

None of the above

Solution

Question 7

Synthetic auxin, kinetin and natural auxin

Gibberellin, natural auxin and kinetin

Natural auxin, kinetin and synthetic auxin

Kinetin, synthetic auxin and natural auxin

Natural auxin, gibberellin and kinetin

Solution

Question 8

Cell elongation

Fruit ripening

Cell division

Inhibit the root growth

Solution

Question 9

Ethylene

Gibberellin

Cytokinin

Indole acetic acid

Solution

Question 10

Auxin treated cells lose selective permeability

ATP production increases and therefore much energy is available for active absorption

Auxin lowers the water potential of cells

None of the above

Solution

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