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NEET NEET Questions — Free MCQ Practice

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

A.

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

B.

prevent early fruit fall only

C.

to produce both seed less fruits and fruits with seeds

D.

to produce larger fruit

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Explanation

Indole acetic acid, indole butyric acid and napthalene acetic acids, are synthetic auxins. These synthetic auxin are used to prevent pre fall of fruit. 2, 4-D is used in apple and and orange NAA is used in tomatoes. The application of these synthetic auxin on unpollinated pistils develops them into parthenocarpic fruits.

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

A.

Skoog and Miller (1957)

B.

Guha and Maheswari (1964)

C.

Calvin and Benson (1894)

D.

Halperin and Wetherall (1964)

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Explanation

Organogenesis or morphogenesis is the regeneration of an organ from the undifferentiated mass of cells. Which is best known as callus. Skoog and Miller(1957) showed that appropriate concentration of phytohormone auxin and cytokinin stimulate the morphogenesis or organogenesis. Higher concentration of auxin with cytokinin promotes cell division in roots while higher concentration of cytokinin with auxin stimulate cell division in roots.

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Which one plant movement is unidirectional?

A.

Phototaxis

B.

Chemotaxis

C.

Both (a) and (b)

D.

Thigmotrophism

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Explanation

The various type of plant movement can be classified as autonomic and paratonic movement. Autonomic movement can be spontaneous and occur on their own while paratonic movement can be induced by stimulant. The paratonic movement man be classified into tropic movement which is caused by external stimuli like light, gravity, touch, water, chemical and electricity and tactic which is induced by chemical heat and radiation, like chemotaxis, phototaxis, thermotaxis and Rheotaxis and nestic movement the taxtic movement is considered unidirectional.

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Natural cytokinins are sythesized in tissue that are:-

A.

senescent

B.

dividing rapidly

C.

storing food material

D.

differentiating

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Explanation

Natural cytokinins are synthesized in tissue that are rapidly dividing

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N6- furfurylamino purine and kinetin are derivative of …….

A. Indol compounds B. Adenine C. carotenoids D. Terpenes

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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Abscisic Acid and ABA are derivative of…..

A. Indol compounds B. Adenine C. carotenoids D. Terpenes

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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C₂H₄ or Ethylene are …...or derivative of….

A. Indol compounds B. Gases C. carotenoids D. Terpenes

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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Gibberellic acid and GA3 are…..or derivative of…

A. Indol compounds B. Adenine C. carotenoids D. Terpenes

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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In the living plant body, the PGRs can be broadly divided into two groups. This classification is actually based on

A. Function B. Structure C. Metabolism D. Kinetin

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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Plant growth promotors are not involved in

A. Cell division, cell enlargement B. Pattern formation, seed formation C. Dormancy, Abscission D. Fruiting and Flowering

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Explanation

Page number-247

15.4 Plant Growth Regulators

15.4.1 Characteristics

Plant Growth And Development

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