Refer the given figures on photoperiodism and select the correct option.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAbscisic acid is known as the stress hormone because it
(1) breaks seed dormancy
(2) induces flowering
(3) promotes leaf fall
(4) promotes closure of stomata
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following plant growth regulators (PGRs) promotes root initiation, flowering and
induced parthenocarpy?
(1) Gibberellin
(2) Auxin
(3) Cytokinin
(4) Ethylene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyVernalisation is subjected to plants growing in ?
(1) tropical
(2) sub tropical areas
(3) temperate areas
(4) hot region/arctic region
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGibberellins 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 & Biology