Plant Growth and Development Test

Result

Plant Growth and Development Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Indole acetic acid is a

A
Chemical found in the retina of nocturnal animals

B
Pesticide

C
Good fertilizer

D
Naturally occurring auxin

Solution

Indole-3-acetic acid (IAA) is the most common, naturally occurring, plant hormone of the AUXIN class. It is the best known of the auxins, and has been the subject of extensive studies by plant physiologists. IAA is a derivative of indole, containing a carboxymethyl substituent.
So, the correct option is D. ( Naturally occuring auxin )
Question 2
1 / -0

The hormone which reduces transpiration rate by inducing stomatal closure is _________________.

A
ABA

B
ethylene

C
cytokinin

D
gibberellin.

Solution

ABA (Absisic acid) is a stress hormone which is synthesised by the plant during drought or other stress conditions. It causes rapid movement of $$K^+$$ ions out of the guard cells, closes stomatal pores and thus reduces the transpiration rate.
Question 3
1 / -0

Choose the correct answer from the alternatives given.
During germination of certain seeds, gibberellic acid activates the synthesis of:

A
starch

B
amylase

C
amylopectin

D
glycogen

Solution

Gibberellic acid enhances the synthesis of α-amylase in isolated aleurone layers of seeds.
So, the correct option is 'amylase'.
Question 4
1 / -0

Natural cytokinins are synthesized in tissues for

A
Differentiating

B
Senescent

C
Dividing

D
Storing food

Solution

Cytokinin is a naturally occurring plant growth hormone (PGR) extracted from coconut milk.
Cytokinins are synthesized in root apex, endosperm of seeds, and young fruits where cell division takes place continuously.
They stimulate cell division, cell enlargement and cell differentiation and also prevent ageing of plant parts.
Hence, natural cytokinins are synthesized in tissues for dividing.
So, the answer is C.
Question 5
1 / -0

Which of the following is a growth promoter hormone?

A
Auxin

B
Abscisic acid

C
Ethylene

D
Both $$B$$ and $$C$$
Solution
- The growth-promoting hormone in the plants are Auxins, Gibberellins, Cytokinesis, etc.
- It improves the growth and development of plants.
- Auxin is synthesized at the tip of the shoot of plants.
- When the tendril came in contact with a support, auxin stimulates faster growth of a cell on the opposite side that's why the tendril forms a coil around the support.
Hence, the correct option is 'auxin'.
Question 6
1 / -0

Rhizocaline is an additional hormonal substance which is secreted by

A
Cotyledons

B
Roots

C
Leaves

D
Stem

Solution

Rhizocaline is a hormone or hormone-like factor distinct from auxin that is held to play a role in the formation of plant roots. It is also called as root forming hormone and it is produced by the leaves.
So, the correct answer is option C.
Question 7
1 / -0

Cytokinins

A
Promotes abscission

B
Influence water movement

C
Help retain chlorophyll

D
Inhibit protoplasmic streaming

Solution

Cytokinins induce the formation of new leaves and chloroplast in leaves. Ethylene promotes abscission in plants. Auxins help in water movement and promote protoplasmic streaming in plants. So, the correct answer is 'Help retain chlorophyll'.
Question 8
1 / -0

Exogenous GA induces the formation of male flowers on genetically female plants of

A
Cucurbita

B
Luffa

C
Cannabis

D
Carica

Solution

Gibberellic acid induce male flowers on female plants of Cannabis sativa. When exogenous gibberellin was induced in genetically female plants of Cannabis, there was marked stem elongation and production of male (staminate) flowers in gibberellin treated female plants of Cannabis. Hence, exogenous GA induces the formation of male flowers on genetically female plants of Cannabis. So, the correct answer is 'Cannabis'.
Question 9
1 / -0

Climacteric is

A
A phenomenon related to fruit ripening.

B
The condition of a plant when most of the leaves turned brown.

C
The conditions of a plant when most of its leaves have turned yellow.

D
None of the above.

Solution

The climacteric is a stage of fruit ripening associated with increased ethylene production and a rise in cellular respiration. Apples, bananas, melons, apricots, tomatoes are climacteric fruits. In most of the plants, there is a sharp rise in respiration rate near the end of the development of fruit, which sets in progress those changes which are involved in ripening of fruit. This sharp rise in respiration is called as climacteric rise or climacteric.
Question 10
1 / -0

In vascular plants, light promotes

A
Growth

B
Development

C
Differentiation

D
All of the above

Solution

Vascular plants are the plants which have fully developed vascular tissues which help in the conduction of water, minerals and food throughout the plant. Light increases the metabolic functions of plant-like photosynthesis, seed germination, transportation, transpiration etc. which further promotes the process like growth, development and differentiation.
So, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 14

Result

Plant Growth and Development Test - 14

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SHARING IS CARING

Question 1

Chemical found in the retina of nocturnal animals

Pesticide

Good fertilizer

Naturally occurring auxin

Solution

Question 2

ABA

ethylene

cytokinin

gibberellin.

Solution

Question 3

starch

amylase

amylopectin

glycogen

Solution

Question 4

Differentiating

Senescent

Dividing

Storing food

Solution

Question 5

Auxin

Abscisic acid

Ethylene

Both $$B$$ and $$C$$

Solution

Question 6

Cotyledons

Roots

Leaves

Stem

Solution

Question 7

Promotes abscission

Influence water movement

Help retain chlorophyll

Inhibit protoplasmic streaming

Solution

Question 8

Cucurbita

Luffa

Cannabis

Carica

Solution

Question 9

A phenomenon related to fruit ripening.

The condition of a plant when most of the leaves turned brown.

The conditions of a plant when most of its leaves have turned yellow.

None of the above.

Solution

Question 10

Growth

Development

Differentiation

All of the above

Solution

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