Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Insect pest resistant Bt cotton plant was developed using

  • somaclonal variation

  • micropropagation

  • somatic hybridisation

  • Transgenic technology


52.

Emasculation ensures cross-pollination in

  • staminate flower

  • bisexual flower

  • neuter flower

  • pistillate flower


53.

Formation of polysome does not require

  • rRNA

  • mRNA

  • tRNA

  • snRNA


54.

Genes which are located only in the X-chromosome are known as

  • epistasis genes

  • holandric genes

  • operator genes

  • antiepistasis genes


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55.

Industrial melanism is an

  • effect of industrial pollution

  • effect of mutation

  • evidence of survival of fittest

  • evidence of favour of natural selection


56.

The concept of hot- spot was first introduced by

  • Mayer

  • Simpson

  • Myers

  • David


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57.

With the rise of water temperature, dissolved oxygen

  • remains unchanged

  • increases in amount

  • decreases in amount

  • is more available to the aquatic organisms


C.

decreases in amount

Dissolved Oxygen (DO) is a relative measure of the amount of oxygen dissolved or carried in a given medium. Water contain very limited amount of dissolved oxygen. It comes from the atmosphere and from photosynthesis by aquatic plants. These aquatic plants and aquatic animals inturn uses this oxygen for respiration and to survive. Temperature inturn effect the solubility of dissolved oxygen in water. Thus, if temperature of water rises the amount of dissolved oxygen get, decreases.


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58.

Intermediate host of malarial parasite is

  • pig

  • man

  • mosquito

  • larva of mosquito


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59.

Which codon is not an indicator of completion of protein synthesis?

  • UAG

  • AUG

  • UAA

  • UGA


60.

'Kyoto Protocol' is a multination international treaty for

  • phasing out green house gases

  • controlling ozone destroying substances

  • management of hazardous wastes

  • conservation of biodiversity


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