Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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


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


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78.

The part of earth in which life exist is known as

  • Lithosphere

  • Biosphere

  • Atmosphere

  • Hydrosphere


B.

Biosphere

Biosphere is the part of earth where life exists.


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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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