Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

Which of the following statement is correct about DDT

  • It is a biomagnifying biodegradable pollutant

  • It is non biomagnifying biodegradable pollutant

  • It is biomagnifying non biodegradable pollutant

  • It is not a pollutant


C.

It is biomagnifying non biodegradable pollutant

DDT has been recently banned because it is non-biodegradable and biomagnifying pollutant. Biomagnification means the increase in amount of DDT in the body of organism along with the increase in trophic level. Hence, the amount of DDT in 1st trophic level will be minimum and in top consumer will be maximum.


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72.

Restriction enzymes are used in genetic engineering, because they

  • can degrade harmful proteins

  • can join different DNA fragments

  • can cut DNA at specific base sequence

  • are nucleases that cut DNA at variable sites


73.

2n-1 condition represent

  • tetrasomy

  • trisomy

  • monosomy

  • multisomy


74.

Double fertilization means

  • fusion of nucleus of male gamete with the egg nucleus

  • fusion of two polar nuclei

  • fusion of sperm nucleus with secondary nucleus

  • fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus


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75.

Micro-organism which act as a vehicle for foreign gene transfer in higher plants

  • Agrobacterium

  • E. coli

  • T.M.V.

  • Bacillus anihracis


76.

DNA polymerase enzyme is required for synthesis of

  • DNA from RNA

  • RNA from DNA

  • DNA from DNA

  • RNA from RNA


77.

In terrestrial ecosystem such as forest, maximum energy is found in which trophic level

  • T1

  • T2

  • T3

  • T4


78.

The part of earth in which life exist is known as

  • Lithosphere

  • Biosphere

  • Atmosphere

  • Hydrosphere


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79.

Which type of DNA is found in bacteria

  • Helical DNA

  • Membrane bound DNA

  • Straight DNA

  • Circular free DNA


80.

Which is social foresting species

  • Leucaena leucocephala

  • Tectona grandis

  • Mangifera indica

  • Rosa indica


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