Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Which of the following approaches does not give the defined action of contraceptive?

  • Intra-uterine devices Increase phagocytosis of sperms, suppress sperm motility and fertilising capacity of sperms.
  •  Hormonal contraceptives Prevent/retard entry of sperms, prevent ovulation and fertilisation
  •  Vasectomy  Prevents spermatogenesis
  •  Vasectomy  Prevents spermatogenesis
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72.

In a test cross involving F1 dihybrid flies, more parental-type offspring were produced that the recombinant type offspring. This indicates

  • chromosomes failed to separate during meiosis

  • the two genes are linked and present on the same chromosome

  • both of the characters are controlled by more than one gene

  • both of the characters are controlled by more than one gene

1338 Views

73.

Match the terms in Column I with their description in Column II and choose the correct option. 


Column I Column II
A. Dominance   1. Many genes governs a single character
B. Codominance  2. In a heterozygous organism, only one allele expresses itself
C. Pleiotropy 3.  In a heterozygous organism both alleles express themselves fully
D. Polygenic inheritance 4. A single gene influences many characters
  • A B C D
    2 3 4 1
  • A B C D
    4 1 2 3
  •  A
     4  1
  •  A
     4  1
814 Views

74.

Whic of the following statements is not correct?

  • Insects that consume pollen or nectar without bringing about pollination are called pollen nectar robbers

  • Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil

  • Some reptiles have also been reported as pollinators in some plant species

  • Some reptiles have also been reported as pollinators in some plant species

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75.

In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to

  • graft rejection

  • auto-immune disease

  • active immunity

  • active immunity

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76.

Which of the following structures is homologous to the wing of a bird?

  • Wing of a moth

  • Hind limb of a rabbit

  • Flipper of whale

  • Flipper of whale

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77.

Seed formation without fertilisation in flowering plants involves the process of

  • budding

  • Somatic hybridisation

  • Apomixis

  • Apomixis

1819 Views

78.

Name the chronic respiratory disorder caused by cigarette smoking

  • asthma

  • respiratoty disease

  • respiratory alkalosis

  • respiratory alkalosis

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79.

In a context of amniocentesis, which of the following statement is incorrect?

  • It is used for prenatal sex determination

  • It can be used for detection of down syndrome

  • It can be used for detection of cleft palate

  • It can be used for detection of cleft palate


C.

It can be used for detection of cleft palate

Cleft palate is a developmental abnormality which may occur in the developing foetus and so it can be detected by sonography and not amniocentesis. 

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80.

Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain

  • harvested antibodies

  • gamma globulin

  • attenuated pathogens

  • attenuated pathogens

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