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) Glbberellin & abscisic acid

Subtopic:  Auxin Function | Cytokinin |
 82%
From NCERT
NEET - 2016
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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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Which of the following is not isolated from plants?

1.NAA

2.IAA3

3.IBA

4.GA3

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 83%
From NCERT
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Auxins

Find the odd one.

1.Initiate rooting in stem cuttings

2.Promote flowering e.g. Pineapples

3.Prevent fruit and leaf drop at early stages

4.Prevent the abscission of older mature leaves and fruits

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 81%
From NCERT
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In most higher plants, the growing apical bud inhibits the growth of …….. or axillary buds, a phenomenon called………….

1.Lateral, lateral Dominance

2.Lateral, Apical Dominance

3.Apical, Lateral Dominance

4.Apical, Apical Dominance

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 88%
From NCERT
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For tea plantations, hedge-making, which of the following PGR is used?

1.Auxins

2.Cytokinins

3.GA3

4.ABA

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 80%
From NCERT
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Parthenocarpic tomato fruits can be produced by:

1. removing androecium of flowers before pollen grains are released
2. treating the plants with low concentrations of gibberellic acid and auxins
3. raising the plants from vernalised seeds
4. treating the plants with phenylmercuric acetate

Subtopic:  Auxin Function | Gibberellin |
 68%
From NCERT
AIPMT - 2006
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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%
From NCERT
NEET - 2019
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Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:

1. Gibberellins prevent bolting and are inactivated.
2.  Auxins prevent leaf drop at early stages.
3. Effect of auxins is removed and the growth of lateral buds is enhanced.
4.  Gibberellins delay the senescence of leaves.

Subtopic:  Growth Hormones & Auxin | Auxin Function |
 82%
From NCERT
NEET - 2019
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The plant hormone used to destroy weeds in a field is:
1. 2, 4-D
2. IBA
3. IAA
4. NAA

Subtopic:  Auxin Function |
 88%
From NCERT
NEET - 2021
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