Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

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

  • Natality

  • Growth rate

  • Mortality

  • All of these


A.

Natality

Natality or birth rate is the rate of production of new individuals per unit of population per unit time through birth. Natality is expressed as Nnt and NnNt = Specific natality rate.

 


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72.

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

  • Grassland

  • Cave

  • River

  • Wetland


73.

Down's syndrome occurs as a result of

  • trisomy

  • tetrasomy

  • autopolyploidy

  • allopolyploidy


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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