Phytohormones are?
(a) hormones regulating growth from seed to adulthood
(b) growth regulators synthesised by plants and influencing physiological process
(c) hormones regulating flowering
(d) hormones regulating secondary growth

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Refer the given figures on photoperiodism and select the correct option.


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Abscisic acid is known as the stress hormone because it

(a) breaks seed dormancy
(b) induces flowering
(c) promotes leaf fall
(d) promotes closure of stomata

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Which of the following plant growth regulators (PGRs) promotes root initiation, flowering and
induced parthenocarpy?

(a) Gibberellin (b) Auxin

(C) Cytokinin (d) Ethylene

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Vernalisation is subjected to plants growing in ?
(a) tropical
(b) sub tropical areas
(c) temperate areas
(d) hot region/arctic region

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Gibberellins can promote seed germination because of their influence on

(a) rate of cell division
(b) production of hydrolyzing enzymes
(c) synthesis of abscisic acid
(d) absorption of water through hard seed coat

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One 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:-

(a) Gibberellin, Auxin, Ethylene

(b) Auxin, Gibberellin, Cytokinin

(c) Gibberellin, Auxin, ABA

(d) Auxin, Gibberellin, ABA

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Identify the incorrect statement about ABA growth regulator.

(a) It increases the tolerance of plants against different stresses.

(b) It acts as general plant growth inhibitor and inhibitor of metabolism.

(c) It helps in seed maturation and dormancy.

(d) It promotes morphogenesis and differentiation of shoots.

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Identfy the incorrect option for effects of the red and far red light.

Red light

Far Red Light

(a) stimulates germination
(b) inhibits flowering in short day plants
(c) causes epicotyls hook to unbend 
(d) Inhibits the formation of anthocyanins

 


inhibits germination
stimulates flowering in short day plants
maintains epicotyls hook bend
stimulates the formation of anthocyanins

 

 

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Which of the following plant growth hormone increase the yield of sugar by increasing the length of stem in sugarcane?
(a) Cytokinin
(b) Ethylene
(c) Gibberellic acid
(d) Auxin

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