Gibberellins can promote seed germination because of their influence on
(1) rate of cell division
(2) production of hydrolyzing enzymes
(3) synthesis of abscisic acid
(4) absorption of water through hard seed coat
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOne hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-
(1) Gibberellin, Auxin, Ethylene
(2) Auxin, Gibberellin, Cytokinin
(3) Gibberellin, Auxin, ABA
(4) Auxin, Gibberellin, ABA
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following plant growth hormone increase the yield of sugar by increasing the length of stem in sugarcane?
(1) Cytokinin
(2) Ethylene
(3) Gibberellic acid
(4) Auxin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRefrigerated fruits maintain flavour and taste for longer period due to:-
(1) non-availability of O2
(2) the presence of excess of CO2
(3) the presence of excess humidity
(4) slower rate of respiration
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe biological clock measures the length at each night by the?
(1) relative amount of red absorbing and far-red absorbing phytochrome present at dawn
(2) amount of far-red absorbing phytochrome at dusk
(3) relative amount of red absorbing and far-red absorbing phytochrome at mid day
(4) rate at which are kind of phytochrome is converted to the other
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyABA is involved in?
(1) shoot elongation
(2) increased cell division
(3) dormancy of seed
(4) root elongation
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHypothetical plant hormones are:-
(1) florigen
(2) vernalin
(3) florigen and vernalin
(4) auxin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology