A physiological response of plants to the duration of light and darkness is a:-

(a) daily phase cycle
(b) circadian rhythms
(c) biological clock
(d) photoperiodism

Concept Questions :-

Photoperiodism
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ABA is involved in?
(a) shoot elongation    (b) increased cell division
(c) dormancy of seed  (d) root elongation

Concept Questions :-

Abscisic Acid
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Hypothetical plant hormones are:-
(a) florigen                    (b) vernalin
(c) florigen and vernalin  (d) auxin

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The application of synthetic plant hormone like IAA, IBA and NAA are best described as:-

(1) prevent early fruit fall before harvesting and is used to produce parthenocarpic fruit

(2) prevent early fruit fall only

(3) to produce both seed less fruits and fruits with seeds

(4) to produce larger fruit

Concept Questions :-

Growth Hormones & Auxin
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Organogenesis or morphogenesis in tissue culture is controlled/regulated by phytohormones the credit of this important discovery goes to

(1) Skoog and Miller (1957)

(2) Guha and Maheswari (1964)

(3) Calvin and Benson (1894)

(4) Halperin and Wetherall (1964)

Concept Questions :-

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Which one plant movement is unidirectional?

(1) Phototaxis

(2) Chemotaxis

(3) Both (a) and (b)

(4) Thigmotrophism

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Natural cytokinins are sythesized in tissue that are:-

(1) senescent

(2) dividing rapidly

(3) storing food material

(4) differentiating

Concept Questions :-

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Which one of the following generally act as an antagonists to gibberellins?

(a) Zeatin (b) Ethylene

(c) ABA    (d) IAA

Concept Questions :-

Abscisic Acid
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The biological clock measures the length at each night by the?

(a) relative amount of red absorbing and far-red absorbing phytochrome present at dawn
(b) amount of far-red absorbing phytochrome at dusk
(c) relative amount of red absorbing and far-red absorbing phytochrome at mid day
(d) rate at which are kind of phytochrome is converted to the other

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Refrigerated fruits maintain flavour and taste for longer period due to:-
(a) non-availability of O2
(b) the presence of excess of CO2
(c) the presence of excess humidity
(d) slower rate of respiration

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