Plant Growth and Development Test

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Plant Growth and Development Test - 78

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following plant growth regulators promotes internode elongation just prior to flowering in beet?

A
Cytokinin

B
Auxin

C
Ethylene

D
Gibberellin
Question 2
1 / -0

Plant growth regulators (PGRs) are-

A
Simple organic substances of different chemical composition

B
Complex organic substances of different chemical composition

C
Simple and complex organic substances of same chemical composition

D
None
Question 3
1 / -0

Auxin was first isolated from

A
Human urine

B
Callus

C
Coconut milk

D
None

Solution

Auxin Indole Acetic Acid is present in human urine, it is a breakdown product of serotonin in the liver which is excreted as a component of urine.
So, the correct answer is 'Human urine'
Question 4
1 / -0

Cytokinin involves

A
Kinetin, zeatin, BAP

B
$$GA_3$$,IBA, Kinetin

C
Zeatin, $$GA_3$$, BAP

D
IAA, Zeatin, kinetin

Solution

Cytokinins involve Kinetin obtained from herring sperm, Zeatin obtained from Zea mays (maize) and BAP is Benzylaminopurine is a synthetic cytokinin.

GA$$_3$$ is Gibberilic acid, IAA and IBA are Auxins
So, the correct answer is 'Kinetin, zeatin, BAP'
Question 5
1 / -0

Cytokinins are predominantly present in:

A
Permanent tissues

B
Meristematic tissues

C
Endodermis

D
Cortical region
Question 6
1 / -0

Which among the following belong to Auxin?

A
IAA, IBA, CK

B
$$GA_3, 2, 4-D, IAA$$

C
IAA, IBA, NAA

D
$$2, 4-D, IAA, ABA$$
Solution
The term ‘auxin’ is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth regulating properties. All natural and synthetic auxins have been used extensively in agricultural and horticultural practices
Natural Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.
NAA (naphthalene acetic acid) and 2, 4-D (2, 4dichlorophenoxyacetic acid) are synthetic auxins.
Hence IAA, IBA, NAAbelong to Auxin.
So, the correct answer is ' IAA, IBA, NAA'.
Question 7
1 / -0

Which of the following statement is wrong about auxin?

A
$$2, 4$$-D prevents the growth of dicot weeds

B
$$2, 4$$-D prevents the growth of monocot weeds

C
It promotes parthenocarpy

D
IAA is natural auxin
Question 8
1 / -0

Select the incorrect statement

A
Frequency of certain genes in a population change over several generations resulting in evolution

B
Reduction in weight of the organism due to starvation is genetically controlled

C
Low weight parents can have heavy weight progeny

D
Traits which are not inherited over generations do not cause evolution
Solution
Correct Answer: B
Explanation:
Frequency of certain genes in a population change over several generations resulting in evolution.
The factors affecting change in genetic frequency are natural selection, genetic drift, mutations and gene flow.
Weight loss or gain occurs due to external factors such as food and is not genetically controlled. Hence, low weight parents can have heavyweight progeny due to differences in food habits.
The frequency of inherited traits change over generation and causes evolution whereas traits that are not inherited over generations like dancing, playing the guitar do not cause evolution.
Question 9
1 / -0

What is the harmful effect of pollutants in plants?

A
Diversity

B
Growth

C
Degradation

D
All of above

Solution

C. Degradation
Solution : Pollution reduces the growth of plants due to their toxic effects and can also degrade them causing loss to biodiversity.
So the correct answer is " Degradation".
Question 10
1 / -0

What is essential to plants growth?

A
Water

B
GHGs

C
$$CO_{2}$$

D
All of above

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 78

Result

Plant Growth and Development Test - 78

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SHARING IS CARING

Question 1

Cytokinin

Auxin

Ethylene

Gibberellin

Question 2

Simple organic substances of different chemical composition

Complex organic substances of different chemical composition

Simple and complex organic substances of same chemical composition

None

Question 3

Human urine

Callus

Coconut milk

None

Solution

Question 4

Kinetin, zeatin, BAP

$$GA_3$$,IBA, Kinetin

Zeatin, $$GA_3$$, BAP

IAA, Zeatin, kinetin

Solution

Question 5

Permanent tissues

Meristematic tissues

Endodermis

Cortical region

Question 6

IAA, IBA, CK

$$GA_3, 2, 4-D, IAA$$

IAA, IBA, NAA

$$2, 4-D, IAA, ABA$$

Solution

Question 7

$$2, 4$$-D prevents the growth of dicot weeds

$$2, 4$$-D prevents the growth of monocot weeds

It promotes parthenocarpy

IAA is natural auxin

Question 8

Frequency of certain genes in a population change over several generations resulting in evolution

Reduction in weight of the organism due to starvation is genetically controlled

Low weight parents can have heavy weight progeny

Traits which are not inherited over generations do not cause evolution

Solution

Question 9

Diversity

Growth

Degradation

All of above

Solution

Question 10

Water

GHGs

$$CO_{2}$$

All of above

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