In which of the following options the PGR is correctly matched with its two functions?

1. Abscisc acid - (i) Induce immediate stomatal closure in leaves.
                         (ii) Induce rooting is a twig.

2. Gibberellins - (i) Bolting in rosette plant.
                        (ii) Speed up the malting process in brewing industry.

3. Ethylene - (i) Delay leaf senescence.
                   (ii) Controls xylem differentiation.

4. Auxin - (i) Used to kill mocotyledonous weeds.
               (ii) Promotes nutrient mobilisation.

Subtopic:  Gibberellin |
 88%
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It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

Subtopic:  Auxin Function | Ethylene |
 79%
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NEET - 2019
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The typical growth curve in plants is:

1. sigmoid
2. linear
3. stair-steps shaped
4. parabolic
Subtopic:  Growth Model |
 87%
From NCERT
NEET - 2015
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You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1.  IAA and gibberellin

2.  Auxin and cytokinin

3.  Auxin and abscisic acid

4.  Gibberellin & abscisic acid

Subtopic:  Auxin Function | Cytokinin |
 84%
From NCERT
NEET - 2016
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A. _______ hormone is most widely used PGR in
agriculture.
B. _______ hormone is related with Richmond Lang
effect.
         A             B
1. Auxin          CK
2. Auxin          GA
3. Ethylene      CK
4. ABA            CK

Subtopic:  Cytokinin | Ethylene |
 57%
From NCERT
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What conditions are required for vernalisation in
plants?

1. Low temperature, CO2.
2. Low temperature, O2, leaf.
3. Optimum temperature, O2.
4. Low temperature, O2.

Subtopic:  Vernalization (OLD NCERT) |
From NCERT
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The phytohormone, which was first isolated from human urine, shows
a. Bolting effect.
b. Apical dominance.
c. Control of xylem differentiation.
d. Promote leaf senescence.
e. Ripening of fruit.
f. Initiation of rooting is stem cuttings.

1. b, c and f 

2. a, d and e

3. b, e and f 

4. a, b and d

Subtopic:  Auxin Function |
 83%
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Vernalisation stimulates flowering in

1. Zamikand

2. Turmeric

3. Carrot

4. Ginger

Subtopic:  Vernalization (OLD NCERT) |
 82%
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Winter varieties resume their Growth in

(1) Spring

(2) Summer

(3) Winter

(4) Autumn

Subtopic:  Vernalization (OLD NCERT) |
 58%
From NCERT
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Winter varieties should be planted in

(1) Winter

(2) Autumn

(3) Spring

(4) Summer

Subtopic:  Vernalization (OLD NCERT) |
 74%
From NCERT
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