Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which of the following pathogens is not transmitted by a vector

  • Salmonella typhi

  • Alpha virus

  • Plasmodium

  • Wuchereria bancrofti


42.

One out of the following is not responsible for biodiversity loss

  • Alien species invasion

  • Co-extinction

  • Ex-situ conservation

  • Deforestation


43.

Which organism is used to transfer T-DNA

  • Streptomyces hygroscopicus

  • Agrobacterium tumefaciens

  • Salmonella typhi

  • Escherichia coli


44.

Primary endosperm nucleus (PEN) is formed by the fusion of

  • 2 polar nuclei + I synergid cell nucleus

  • I polar nucleus + I antipodal cell nucleus + I synergid cell nucleus

  • 2 polar nuclei+ I male gamete nucleus

  • 2 antipodal cell nuclei + I male gamete nucleus


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45.

Which of the following set of options is used in translation

  • hnRNA, tRNA, rRNA

  • mRNA, tRNA, rRNA

  • mRNA, tRNA, hnRNA

  • hnRNA, rRNA, tRNA


46.

In rabbits, the gene for grey fur (G) is dominant over that for black fur (g). In a litter, if 50% rabbits are grey, then the possible parental cross combination is

  • GG x Gg

  • gg X gg

  • GG x GG

  • Gg x gg


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47.

Barr body is missing in the female suffering from

  • Huntington's disease

  • Tay-sach's disease

  • Klinefelter's syndrome

  • Turner's syndrome.


D.

Turner's syndrome.

In normal females, number of Barr bodies is one less than the number ofX chromosomes. One Barr body means the female has two X chromosomes. Turner's syndrome (44 + XO) is a genetic disorder that affects only females. In this condition, cells of the affected female possess only one X chromosome, instead of two. Due to the presence of only one X chromosome, no Barr body is present in females suffering from Turner's syndrome


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48.

Which is genetically not possible

  • Haemophilic father transfers the haemophilic gene to his son.

  • Haemophilic father transfers the haemophilic gene to his daughter.

  • Carrier mother transfers the haemophilic gene to her son.

  • Carrier mother transfers the haemophilic gene to her daughter


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49.

Which one ofthe following is reptilian ancestor of birds

  • Hesperornis

  • Archaeopteryx

  • Ichthyornis

  • Lycaenops


50.

Select the correct explanation for the labels A, B, C and D

  • A represents the fertilised zygote.

  • B represents the stage of morula formation.

  • C represents the blastocyst.

  • D represents the blastocyst implantation


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