Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

The breakdown of detritus into smaller particles by earthworm is a process called 

  • humification 

  • fragmentation

  • mineralisation

  • mineralisation


B.

fragmentation

The breakdown of detritus (dead remains of plants and animals) into smaller particles by detrivores like earth worm is called fragmentation. it is the first step in the process of decomposition.

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42.

The unequivocal proof of DNA as the genetic material came from the studies on a 

  • bacterium

  • fungus

  • viroid

  • viroid


D.

viroid

The unequivocal (leaving no doubt; unambiguous) proof that DNA is the genetic material came from the experiments of Alfred Hershey and Martha chase. They worked with viruses that infect bacteria called bacteriophages.

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43.

Biodiversity of a geographical region represents

  • endangered species found in the region

  • the diversity in the organism living in the region

  • genetic diversity present in the dominant species of the region

  • genetic diversity present in the dominant species of the region


B.

the diversity in the organism living in the region

Biodiversity is the term popularised by the sociobiologist Edward Wilson to describe the combined diversity at all the levels of biological organisation. The most important of the are genetic diversity, species diversity and ecological diversity.

335 Views

44.

Sweet potato is homologous to 

  • potato

  • colocasia

  • ginger

  • ginger


D.

ginger

Sweet potato (Ipomoea batatas) and turnip (Brassica rapa)both are roots. However, sweet potato is tuberous adventitious root while turnip is napiform tap -root.

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45.

What is common between vegetative reproduction and apomixis?

  • Both are applicable to only dicot plants

  • Both bypass the flowering phase

  • Both occur round the year

  • Both occur round the year


D.

Both occur round the year

Both vegetative and apomixis are an asexual reproduction. The progeny produced are genetically similar to a parent and are called clone.

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46.

Test cross in plants of in Drosophila involves crossing 

  • Between two genotypes with recessive trait

  • Between two F1 hybrids

  • the F1 hybrid with a double recessive genotype

  • the F1 hybrid with a double recessive genotype


C.

the F1 hybrid with a double recessive genotype

When F1 hybrid is crossed with a recessive parent then it is called test cross. It is also a backcross. A test cross is done to test whether the dominant parent is heterozygous or homozygous.

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47.

Consider the following statements (I) - (IV) each with one or two blanks.

I. Bears go into ..... (1)  .... during winter to .......(2) ..... cold weather.
II. A conical age pyramid with a broad base represents ......(3) ....... human population.
III. A wasp pollinating a fig flower is an example of ........ (4) ..........
IV. An area with high levels of species richness is known as ........ (5) .......

Which one of the following options give the correct fill up the respective blanks numbers from (1) to (5) in the statements.

  • (2) stable, (4) commensalism, (5) marsh

  • (1) aestivation, (5) escape, (3) stable, (4) mutualism

  • (3) expanding, (4) commensalism, (5) biodiversity park

  • (3) expanding, (4) commensalism, (5) biodiversity park


D.

(3) expanding, (4) commensalism, (5) biodiversity park

Bears go into hibernation during winter t o escape the cold weather. 

A conical age pyramid with a broad base represents expanding the human population.
A wasp pollinating a fig flower is an example of mutualism.

An area with high levels of species richness is known as hot spots.

252 Views

48.

Common cold is not cured by antibiotics because it is

  • caused by a virus

  • caused by a Gram-positive bacterium

  • caused by a Gram-negative bacterium

  • caused by a Gram-negative bacterium


A.

caused by a virus

the common cold is not cured by antibiotics because it is caused by a virus, called rhinoviruses

288 Views

49.

In angiosperms, functional megaspore develops into

  • embryo sac

  • ovule

  • endosperm

  • endosperm


A.

embryo sac

In angiosperms, the unit of female gametophyte (embryo sac) is functional megaspore.

505 Views

50.

Which one of the following option gives the correct matching of a disease with its causative organism and mode of infection?

  • Disease

    Gausative Organisms

    Mode of infection

    Typhoid

    Salmonella typhi

    With inspired air

  • Disease

    Gausative Organisms

    Mode of infection

    Pneumonia

    Sreptococcus pneumoniae

    Droplet infection

  • Disease

    Gausative Organisms

    Mode of infection

    Elephantiasis

    Wuchereria bancrofti

    Infected water and food

  • Disease

    Gausative Organisms

    Mode of infection

    Elephantiasis

    Wuchereria bancrofti

    Infected water and food


B.

Disease

Gausative Organisms

Mode of infection

Pneumonia

Sreptococcus pneumoniae

Droplet infection

Bacteria like Streptococcus pneumoniae and Haemophilus influenza are responsible for the disease pneumonia in humans which infect alveoli (air-filled sacs) of the lungs. As a result of infection, the alveoli get filled with fluid leading to a severe problem in respiration. A healthy person acquires the infection by inhaling the droplets/aerosols released by an infected person or even by sharing glasses and utensils with an infected person.

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