Cytokinin does not help in:
1. Lateral shoot growth
2. Overcoming apical dominance
3. Adventitious shoot formation
4. Promoting leaf senescence
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn most situations, which of the following acts as an antagonist to GAs?
1. ABA
2. IAA
3. Kinetin
4. Ethylene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is the site for perception of light/dark in plants?
1. Root apex
2. Shoot apex
3. Leaves
4. Flower
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
1. cause increased flower production.
2. have no effect upon flowering.
3. inhibit flowering.
4. stimulate flowering.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following statements about plant hormones is false?
1. The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones.
2. Abscisic acid generally promotes growth.
3. Gibberellins stimulate cell enlargement.
4. Cytokinins promote cell division.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAt the root apex the cells of the meristematic region are not characterized by:-
1. Being rich in protoplasm
2. Abundant plasmodesmatal connections
3. A cell wall that is primary in nature
4. Having small inconspicuous nuclei
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAll the following plants are biennials except:-
1. Sugarbeet
2. Cabbages
3. Carrots
4. Wheat
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the option where all the columns are not correctly matched:
|
PGR |
Nature |
Actions |
1. |
Auxin |
Indole compounds |
Apical dominance, Flowering in pineapples, Parthenocarpy in tomatoes |
2. |
Cytokinin |
Adenine derivative |
Cell division, Adventitious shoot formation, Delay in leaf senescene |
3. |
Gibberellin |
Terpene |
Increase in length |
4 . |
ABA |
Carotenoid derivative |
Closure of stomata in water stress, inducing seed dormancy, inducing flowering in mango |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe PGR used to induce parthenocarpy in tomatoes is:-
1. Auxin
2. Gibberellin
3. Cytokinin
4. ABA
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrimary and secondary growth are inhibited by:
1. Auxins
2. Gibberellins
3. Abscisic acid
4. Cytokinins
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology