Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

61.

Hormone responsible for the secretion of milk after parturition is

  • ICSH

  • Prolactin

  • ACTH

  • LH


62.

MRI is not allowed in the following conditions except one. Identify the exception

  • Presence of pacemaker in the body

  • Pregnant women

  • Person suffering from stroke

  • Presence of metallic plate in the body for treatment of broken bones


63.

Which of the following diseases is related to cadmium pollution?

  • Minamata

  • Pneumoconiosis

  • Anaemia

  • Itai- Itai


64.

First genetically modified plant commercially released in India is

  • golden rice

  • slow ripening tomato

  • Bt brinjal

  • Bt cotton


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65.

In a DNA molecule, distance between two bases is

  • 2 nm/ 20 Å

  • 0.2 nm/ 2 Å

  • 3.4 nm/ 34 Å

  • 0.34 nm/ 3.4 Å


C.

3.4 nm/ 34 Å

DNA is a double-stranded polynucleotide arranged in a double helix. The two strands are entwined around one another, each complete coil measures 3.4 nm (10 bases long). Each strand links to the other by pairs of organic bases, where the pairings are always cystosine with guanine and thymine with adenine. The two strands that form the uprights run antiparallel, ie, in opposite directions.


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66.

Exine of pollen grain is made up o

  • pectocellulose

  • lignocellulose

  • sporopollenin

  • pollen kit


67.

Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of wheat?

  • 42

  • 21

  • 7

  • 14


68.

Micropropagation is a technique for production of

  • true to type plants

  • haploid plant

  • somatic hybrids

  • somaclonal plants


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69.

Test cross is a cross between

  • hybrid and dominant parent

  • hybrid and recessive parent

  • two hybrid parents

  • two distantly related species


70.

Balbiani rings are the sites of

  • DNA replication

  • RNA and protein synthesis

  • synthesis of lipids

  • synthesis of polysaccharides


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