Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which of the following pesticides is an acetylcholinesterase inhibitor?

  • Aldrin

  • BHC

  • Endosulfan

  • Malathion


52.

The sphere of living matter together with water, air and soil on the surface of earth is called

  • atmosphere

  • hydrosphere

  • lithosphere

  • biosphere


53.

Chloromycetin is obtained from

  • Streptomyces venezuelae

  • Streptomyces rimosus

  • Bacillus subtilis

  • Clostridium botulinum


54.

Mutualism is found in

  • hermit crab and sea anemone

  • ox pecker and rhinoceros

  • zoochlorellae and Hydra

  • E.coli and man


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55.

Extranuclear genes occurs in

  • plastids and are not inherited

  • plasmid and are not inherited

  • mitochondria and are inherited by female

  • mitochondria and are inherited by male


C.

mitochondria and are inherited by female

Cytoplasmic inheritance or non- chromosomal inheritance is the passage of traits from parents to offspring through structures present inside cytoplasm of contributing gametes. Genes controlling cytoplasmic inheritance are called plasma genes or extra nuclear genes. They occur in plastids, mitochondria, plasmids. It is usually uniparental. Also, it is known as maternal inheritsnce.


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56.

During formation of which of the following free nuclear division occurs?

  • Flower

  • Endosperm

  • Gametes

  • Fruit


57.

An oocyte is released from the ovary under the influence of LH 

  • after completing meiosis and before polar bodies are released

  • after completing meiosis I and before release of polar bodies

  • after completing meiosis

  • after completing meiosis I and after release of polar bodies.


58.

In prokaryotes, genetic recombination can occur during

  • transduction

  • transformation

  • conjugation

  • all of these


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59.

Which is Indian dwarf wheat?

  • T. dicoccum

  • T. sphaerococcum

  • T. turgidum

  • T. aestivum


60.

Assertion : Watson and Crick provided experimental proof of semiconservative nature of DNA replication.

Reason : DNA polymerase binds nucleotides in replication.

  • If both Assertion and Reason are true and Reason is the correct explantion of Assertion

  • If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If Assertion is false but Reason is true.


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