Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

81.

Acid rain is caused by increase in the atmospheric concentration of

  • SO subscript 2 space and space NO subscript 2
  • SO subscript 3 space and space CO
  • CO subscript 2 space and space CO
  • CO subscript 2 space and space CO
1326 Views

82.

In which of the following interactions both partners are adversely affected?

  • Competition

  • Predation

  • Parasitism

  • Parasitism

1508 Views

83.

Match the following list of microbes and their importance:

(a) Sacharomyces cerevisiae (i) Production of immunosuppressive agents
(b) Monascus purpureus (ii) Riperuing of Swiss cheese
(c) Trichoderma polysporum (iii) Commercial production of ethanol
(d) Propionibacterium sharmanii (iv) Production of blood cholesterol lowering agents
  • Codes
     A   B   C    D
    3    4    1    2

  • A   B   C   D
    4   3    2   1

  • A   B   C   D
    4   2    1   3

  • A   B   C   D
    4   2    1   3

772 Views

84.

A pleiotropic gene

  • is expressed only in primitive plants.

  • is a gene evolved during Pliocene

  • controls a trait only in combination with another gene

  • controls a trait only in combination with another gene

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85.

Grafted kidney may be rejected in a patient due to

  • Humoral immune response

  • Cell-mediated immune response

  • Passive immune response

  • Passive immune response

1288 Views

86.

Which one of the following fruits is parthenocarpic?

  • Brinjal

  • Apple

  • Jackfruit

  • Jackfruit

1160 Views

87.

Which of the following diseases is caused by a protozoan?

  • Syphilis

  • Influenza

  • Babesiosis

  • Babesiosis

1297 Views

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88.

Male gametophyte in angiosperms produces

  • Two sperms and a vegetative cell

  • Single sperm and a vegetative cell

  • Single sperm and a two vegetative cells

  • Single sperm and a two vegetative cells


A.

Two sperms and a vegetative cell

Pollen grain or male gametophyte in angiosperms contain one generative cell. The generative cell. The generative cell further divides mitotically to form two male gametes(sperms). So, a mature male gametophyte in angiosperms contains two sperms and one vegetative cell. 

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89.

Satellite DNA is important because it

  • codes for proteins needed in cell cycle.

  • shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

  • does not code for proteins and is same in all members of the population.

  • does not code for proteins and is same in all members of the population.

1094 Views

90.

Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of 

  • food

  • light

  • essential minerals

  • essential minerals

1418 Views

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