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Q. No.Dr. F Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?
1. It made possible the isolation and exact identification of auxin.
2. It is the basis for quantitative determination of small amounts of growth-promoting substances
3. It demonstrated polar movement of auxins
4. It supports the hypothesis that IAA is auxin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA few normal seedlings of tomato were kept in a dark room. After a few days they were
found to have become white-coloured like albinos. Which of the following terms will you
use to describe them?
1. Mutated
2. Embolised
3. Etiolated
4. Defoliated
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one of the following growth regulators is known as "stress hormone" ?
1. abscisic acid
2. Ethylene
3. GA3
4. lndole acetic acid
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring seed germination its stored food is mobilised by.
1. ethylene
2. cytokinin
3. ABA
4. gibberellin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhototropic curvature is the result of uneven distribution of.
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhotoperiodism was first characterised in :-
1. tobacco
2. potato
3. tomato
4. cotton
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCoiling of garden pea tendrils around any support is an example of
1. thigmotaxis
2. thigmonasty
3. thigmotropism
4. thermotaxis
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOne of the synthetic auxin is
1. NAA
2. IAA
3. GA
4. IBA
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySenescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
1. vessels and tracheid differentiation
2. leaf abscission
3. annual plants
4. floral parts
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