Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

During the G1- phase of cell division

  • RNA and proteins are synthesised

  • DNA and proteins are synthesised

  • cell prepares for M- phase

  • cell undergoes duplication


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52.

The bioassay of auxin is

  • avena curvature test

  • callus formation

  • culture of fungus

  • seed dormancy


A.

avena curvature test

Bioassay is the testing of biological activity of a substance by employing living material. Went  used Avena sativa (oat) coleoptiles in a technique called Avena coleoptile curvature test.

ABA or abscisic acid induces dormancy in buds, seeds and underground storage organs. In callus culture, shoot and root regenration is generally controlled by auxin and cytokinin ratio.


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53.

Clinging roots are found in

  • orchids

  • Trapa

  • Podostemon

  • screwpine


54.

Water bloom is generally caused by

  • green algae

  • blue- green algae

  • bacteria

  • Hydrilla


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55.

The process which cannot take place in the absence of viruses is

  • transformation

  • conjugation

  • translocation

  • transduction


56.

Molybdenum causes

  • mottling

  • wilting

  • reclamation

  • chlorosis


57.

From which of the following plant is a medicine for respiratory disorders obtained?

  • Ephedra

  • Eucalyptus

  • Cannabis

  • Saccharum


58.

Decarboxylation is involved in

  • electron transport system

  • glycolysis

  • Kreb's cycle

  • lactic acid fermentation


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59.

Osmotic pressure of a solution is

  • greater than pure solvent

  • less than pure solvent

  • equal to pure solvent

  • less than or greater than pure solvent


60.

In Whittaker's system of classification, prokaryotes belong to the kingdom

  • Monera

  • Protista

  • Animalia

  • Fungi


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