Phytochromes play a role in 

(1) seed germination

(2) flowering 

(3) photomorphogenesis

(4) photosynthesis.

Subtopic:  Photoperiodism (OLD NCERT) |
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NEET 2023 - Target Batch - Aryan Raj Singh
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Induction of flowering by low temperature in plants is 

1. cryobiology

2. vernalization 

3. phototropism

4. pruning.

Subtopic:  Vernalization (OLD NCERT) |
 94%
From NCERT
AIIMS - 2001
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following statements is correct regarding short day plants (SDPs)?

1. They can flower in complete darkness if supplied with exogenous nutrients.

2. They are the same as long day plants.

3. They do not have a critical photoperiod.

4. All of these.

Subtopic:  Photoperiodism (OLD NCERT) |
 65%
AIIMS - 2001
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NEET 2023 - Target Batch - Aryan Raj Singh
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Bud dormancy is induced by:-

1. ABA

2. ethylene

3. IAA

4. gibberellic acid.

Subtopic:  Abscisic Acid |
 72%
From NCERT
AIIMS - 2002
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NEET 2023 - Target Batch - Aryan Raj Singh

Pruning of plants promotes branching because the auxillary buds get sensitized to:-

1. ethylene

2. gibberellin

3. cytokinin

4. indole acetic acid

Subtopic:  Growth Hormones & Auxin |
 58%
AIIMS - 2004
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Phytohormones are?
(1) hormones regulating growth from seed to adulthood

(2) growth regulators synthesised by plants and influencing physiological process

(3) hormones regulating flowering

(4) hormones regulating secondary growth

Subtopic:  Growth Hormones & Auxin |
 68%
AIIMS - 2008
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Refer the given figures on photoperiodism and select the correct option.


Subtopic:  Photoperiodism (OLD NCERT) |
 88%
From NCERT
AIIMS - 2010
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NEET 2023 - Target Batch - Aryan Raj Singh

Abscisic acid is known as the stress hormone because it

(1) breaks seed dormancy

(2) induces flowering

(3) promotes leaf fall

(4) promotes closure of stomata

Subtopic:  Abscisic Acid |
 79%
From NCERT
AIIMS - 2012
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following plant growth regulators (PGRs) promotes root initiation, flowering and
induced parthenocarpy?

(1) Gibberellin

(2) Auxin

(3) Cytokinin

(4) Ethylene

Subtopic:  Growth Hormones & Auxin |
 85%
From NCERT
AIIMS - 2013
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NEET 2023 - Target Batch - Aryan Raj Singh

Vernalisation is subjected to plants growing in ?
(1) tropical

(2) sub tropical areas

(3) temperate areas

(4) hot region/arctic region

Subtopic:  Vernalization (OLD NCERT) |
 53%
AIIMS - 2014
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NEET 2023 - Target Batch - Aryan Raj Singh
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