Which one of the following acids is a derivative of carotenoids?

1. Indole-butyric acid

2. Indole-3-acetic acid

3. Gibberellic acid

4. Abscisic acid

Subtopic:  Abscisic Acid |
 78%
From NCERT
NEET - 2009
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Vernalization is the process of

1. flower induction by high temperature treatment

2. inhabitation of flowering by low temperature treatment

3. flower induction by light treatment

4. acceleration of the ability of a plant to produce flowers by chilling treatment

Subtopic:  Vernalization (OLD NCERT) |
 54%
From NCERT
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Bud dormancy is induced by:-

1. ABA

2. ethylene

3. IAA

4. gibberellic acid.

Subtopic:  Abscisic Acid |
 71%
From NCERT
AIIMS - 2002
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Refer the given figures on photoperiodism and select the correct option.


Subtopic:  Photoperiodism (OLD NCERT) |
 87%
From NCERT
AIIMS - 2010
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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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Identify the incorrect statement about ABA growth regulator.

1. It increases the tolerance of plants against different stresses.
2. It acts as general plant growth inhibitor and inhibitor of metabolism.
3. It helps in seed maturation and dormancy.
4. It promotes morphogenesis and differentiation of shoots.

Subtopic:  Abscisic Acid |
 75%
From NCERT
AIIMS - 2017
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In the process of apical dominance, lateral buds are unable to grow in the presence of apical bud. This is due to:-
(1) less amount of cytokinins in lateral buds

(2) more amount of cytokinins in lateral buds

(3) less amount of auxin in lateral buds

(4) more amount of auxin in lateral buds

Subtopic:  Growth Hormones & Auxin | Auxin Function |
AIIMS - 2016
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A physiological response of plants to the duration of light and darkness is a:-

(1) daily phase cycle

(2) circadian rhythms

(3) biological clock

(4) photoperiodism

Subtopic:  Photoperiodism (OLD NCERT) |
 90%
From NCERT
AIIMS - 2014
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The application of synthetic plant hormone like IAA, IBA and NAA are best described as:-

(1) prevent early fruit fall before harvesting and is used to produce parthenocarpic fruit

(2) prevent early fruit fall only

(3) to produce both seed less fruits and fruits with seeds

(4) to produce larger fruit

Subtopic:  Growth Hormones & Auxin |
 86%
From NCERT
AIIMS - 2013
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Natural cytokinins are synthesized in tissue that are:-

(1) senescent

(2) dividing rapidly

(3) storing food material

(4) differentiating

Subtopic:  Cytokinin |
 76%
From NCERT
AIIMS - 2012
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