Plant Growth and Development Test

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Plant Growth and Development Test - 13

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Question 1
1 / -0

Auxins are mostly produced in

A
Shoot

B
Meristematic region of stem

C
Root

D
Leaf buds

Solution

Auxin is a plant hormone that is involved in various physiological processes. It promotes cell elongation. Hence, it is mostly produced in the meristematic region of stem. It is also present on the tip of roots and buds.
Thus, the correct answer is option B.
Question 2
1 / -0

Seed dormancy is induced by

A
ABA

B
GA

C
Thiourea

D
Cytokinin

Solution

Abscisic acid is a plant hormone. It is also called as stress hormone. During unfavourable environmental conditions like drought, it induces seed dormancy. When there is favaourable condition, seed dormancy is broken and germination takes place.
Thus, the correct answer is option A.
Question 3
1 / -0

Which is not a natural plant hormone?

A
$${GA}_{3}$$

B
$${GA}_{2}$$

C
$$IAA$$

D
$$2, 4-D$$

Solution

A 2,4-D is a synthetic auxin, a plant hormone. It acts as herbicide. GA$$_3$$ and GA$$_2$$ are types of gibberellin, a natural plant hormones. They regulate plant growth and development. IAA (indoleacetic acid) is a most common natural auxin hormone.
Thus, the correct answer is option D.
Question 4
1 / -0

Synthetic plant hormone is

A
IAA

B
2, 4-D/NAA

C
GA

D
Zeatin

Solution

There are several plant hormones which regulates the plant growth. Hormones like gibberellic acid (GA), Indoleacetic acid (IAA), a type of auxin, zeatin, most common type of cytokinin are growth promoter. Hormones like Abscisic Acid (ABA), ethylene are growth inhibitor. Naphthaleneacetic acid (NAA) and 2,4-D hormones are synthetic hormones. NAA promotes growth whereas 2,4-D act as weedicide .
Thus, the correct answer is option B.
Question 5
1 / -0

Which hormone is produced in most plant cells as product of metabolism?

A
Gibberellin

B
Cytokinin

C
Auxin

D
Ethylene

Solution

Gibberellin is a plant hormone. It was first identified as a product of metabolism obtained from fungus Gibberella fujikuroi. This fungus causes Bakanae disease in rice.
Thus, the correct answer is option A.
Question 6
1 / -0

Gibberellins are

A
Proteinaceous

B
Amines

C
Acidic

D
Alkaline

Solution

Gibberellin is a plant hormone. It acts as plant growth promoter. It is involved various physiological processes of plants. It is acidic in nature. Chemically, it is pentacyclic diterpene acid. It stimulates flowering, germination and stem elongation.
Thus, the correct answer is option C.
Question 7
1 / -0

Which hormone promotes rooting in cuttings

A
Gibberellin

B
Cytokinin

C
Auxin

D
None of the above

Solution

Auxin promotes rooting for the cuttings. NAA is a prominent auxin which is used to promote rooting in stem cuttings. NAA is known as naphthalene acetic acid. It is a synthetic auxin which promotes rooting in dwarf plants or stem. It also decreases the rate of senescence and abscission. It promotes respiration and increases the rate of metabolism. It increases the sweetening in certain fruits.
So, the correct answer is option C.
Question 8
1 / -0

Cytokinins are byproducts of

A
Fat metabolism

B
Protein metabolism

C
Carbohydrate metabolism

D
Nucleic acid metabolism

Solution

Cytokinins are a type of plant growth substances or plant growth regulators that are involved primarily in cell growth and differentiation. But can also affect or interfere with exility growth apical growth sector.
The compounds that have a kind of resembling structure to the nucleic acid adenine that promotes cell division and has other similar functions to Kinetin. Cytokinins are formed from the nucleic acid metabolism

So, the correct option is 'Nucleic acid metabolism'
Question 9
1 / -0

Which one is the main effect of auxin, important for commercial purpose?

A
Weed Killer

B
Parthenocarpy

C
Early rooting in stem cutting

D
None of these

Solution

Auxins inhibit elongation of the primary root but stimulate root initiation on stem cuttings (adventitious roots) and lateral root development. Lateral roots are commonly found above the root hair zone and originate from cells present in the pericycle. Auxin stimulates these pericycle cells to divide. The dividing cells gradually give rise to the lateral root.
So, the correct answer is C.
Question 10
1 / -0

The hormones which are found to be more effective in inducing parthenocarpy are

A
Cytokinins

B
Ethylene

C
Auxins

D
Ethephon

Solution

Parthenocarpy is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Cytokinin is more effective in inducing parthenocarpy because cytokinin induced fruit showed enhanced accumulation of gibberellins and auxins which are also responsible for inducing parthenocarpy.
So, the correct answer is 'Cytokinins'.

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Plant Growth and Development Test - 13

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Plant Growth and Development Test - 13

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Question 1

Shoot

Meristematic region of stem

Root

Leaf buds

Solution

Question 2

ABA

GA

Thiourea

Cytokinin

Solution

Question 3

$${GA}_{3}$$

$${GA}_{2}$$

$$IAA$$

$$2, 4-D$$

Solution

Question 4

IAA

2, 4-D/NAA

GA

Zeatin

Solution

Question 5

Gibberellin

Cytokinin

Auxin

Ethylene

Solution

Question 6

Proteinaceous

Amines

Acidic

Alkaline

Solution

Question 7

Gibberellin

Cytokinin

Auxin

None of the above

Solution

Question 8

Fat metabolism

Protein metabolism

Carbohydrate metabolism

Nucleic acid metabolism

Solution

Question 9

Weed Killer

Parthenocarpy

Early rooting in stem cutting

None of these

Solution

Question 10

Cytokinins

Ethylene

Auxins

Ethephon

Solution

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