Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

The equation NnNt= B represents, which of the following?

  • Natality

  • Growth rate

  • Mortality

  • All of these


72.

Identify which one of the following is an example, of incomplete ecosystem?

  • Grassland

  • Cave

  • River

  • Wetland


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73.

Down's syndrome occurs as a result of

  • trisomy

  • tetrasomy

  • autopolyploidy

  • allopolyploidy


A.

trisomy

Down's Syndrome is Trisomy of 21st chromosome. It is characterized by mental retardation, short stature with stubby fingers and heart defects.


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74.

Only one of the following four ways through which AIDS can spread?

  • Infected needles and syringes

  • Through mosquito bites

  • Looking after AIDS patient

  • Shaking hands, coughing, sneezing, hugging


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75.

Passive immunity can be obtained through

  • antigens

  • vaccines

  • antibiotics

  • antibodies


76.

Active immunity development is related to

  • natural killer cells

  • memory cells

  • helper T cells

  • suppressor T cells


77.

Filariasis is caused by

  • dead adult filariae

  • microfilariae

  • biting of filarial worm

  • presence of bacteria in filarial wall


78.

Indicate, the inheritance of which of the following is controlled by multiple alleles?

  • Colourblindness

  • Sickle cell anaemia

  • Blood group

  • Phenylketoneuria


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79.

Which of the following conditions is related to haemophilia?

  • A responsible recessive gene present in the X-chromosome

  • A responsible dominant gene presentin the X-chromosome

  • A responsible dominant gene present in the Y-chromosome

  • A responsible dominant gene present in the autosomal chromosome


80.

The absence of which clotting factor leads to haemophilia-A?

  • Factor VII

  • Factor VIII

  • Factor IX

  • Factor X


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