Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

What is the main cause for the extinction of some species in tropical forest?

  • Deforestation

  • Afforestation

  • Pollution

  • Soil erosion


A.

Deforestation

Deforestation is the depletion of forest resources. Its main cause is the explosion of human and livestock populationwith the increased demand of the basic needs.

The major cause of deforestation is the loss of wildlife, rare speies of flora and fauna.

Afforestation or reforestation is the only way to conserve our natural resources and the rare species of flora and fauna.


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72.

The presence of diversity at the junction of territories of two different habitats is known as

  • bottleneck effect

  • edge effect

  • junction effect

  • Pasteur effect


73.

In Cycas, pollination takes place in

  • 3- celled stage

  • 4- celled stage

  • 2- celled stage

  • 1- celled stage


74.

A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?

  • Introns

  • Exons

  • Both (a) and (b)

  • None of these


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75.

L- shaped chromosomes are also called

  • acrocentric

  • telocentric

  • sub- metacentric

  • None of these


76.

A bacterium divides after every 35 min, if a culture containing 105 cells per mL is grown, then cell concentration per mL after 175 mins will be

  • 175×105

  • 125×105

  • 48×105

  • 32×105


77.

Biological concept of species is mainly based on

  • reproductive isolation

  • morphological features only

  • methods of reproduction only

  • morphology and methods of reproduction


78.

In the treatment of waste water discharge, which treatment stage involves biological treatment?

  • Primary treatment

  • Secondary treatment

  • Tertiary treatment

  • Reverse osmosis stage


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79.

Nucellus forms which of the following part of fruit?

  • Seed coat

  • Perisperm

  • Seed

  • Raphe


80.

If root of a flowering plant has 24 chromosomes, then its gamete has how many chromosomes?

  • 24

  • 12

  • 4

  • 8


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