Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

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


D.

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

Pollen grains of others species are not compatible and do not germinate on the stigma of the flower of a different species. 

1522 Views

72.

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

A.

A B C D
2 3 4 1

Dominance is when only one gene expresses itself in the heterozygous condition.
Co-dominance is when both the genes express in the heterozygous condition.
Pleiotropy is when a single gene controls more than one phenotype. 
Polygenic inheritance is when a single trait is controlled by many genes

814 Views

73.

Seed formation without fertilisation in flowering plants involves the process of

  • budding

  • Somatic hybridisation

  • Apomixis

  • Apomixis


C.

Apomixis

Apomixis is the special mechanism found in flowering plants to produce seeds without fertilisation. 

1819 Views

74.

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


B.

the two genes are linked and present on the same chromosome

When two genes are linked they are inherited together and result in the increase in the appearance of the parental characters.

1338 Views

75.

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. 

1531 Views

76.

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

  • harvested antibodies

  • gamma globulin

  • attenuated pathogens

  • attenuated pathogens


C.

attenuated pathogens

The oral polio vaccines consists of attenuated pathogens. 

1349 Views

77.

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


B.

auto-immune disease

When the immune system cannot differentiate between self and non-self cells then the immune system attcks and destroys the self cells and this is called auto-immunity.

1069 Views

78.

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


C.

 Vasectomy  Prevents spermatogenesis

Vasectomy blocks the gamete transport and does not affect spermatogenesis.

2255 Views

79.

Name the chronic respiratory disorder caused by cigarette smoking

  • asthma

  • respiratoty disease

  • respiratory alkalosis

  • respiratory alkalosis


D.

respiratory alkalosis

Emphysema is characterised by inflation or distention of alveoli by dissolution of wall of the two adjacent lung alveoli.

905 Views

80.

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


C.

Flipper of whale

Wings of bird and flipper of whale are modified forelimbs of the two organisms so have same origin wings help in flying and flippers help in swimming but thus perform the different functions

1538 Views