Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

81.

Match the following list of microbes and their importance:

(a) Sacharomyces cerevisiae (i) Production of immunosuppressive agents
(b) Monascus purpureus (ii) Riperuing of Swiss cheese
(c) Trichoderma polysporum (iii) Commercial production of ethanol
(d) Propionibacterium sharmanii (iv) Production of blood cholesterol lowering agents
  • Codes
     A   B   C    D
    3    4    1    2

  • A   B   C   D
    4   3    2   1

  • A   B   C   D
    4   2    1   3

  • A   B   C   D
    4   2    1   3


A.

Codes
 A   B   C    D
3    4    1    2

772 Views

82.

Acid rain is caused by increase in the atmospheric concentration of

  • SO subscript 2 space and space NO subscript 2
  • SO subscript 3 space and space CO
  • CO subscript 2 space and space CO
  • CO subscript 2 space and space CO

A.

SO subscript 2 space and space NO subscript 2

Acid rain is caused by increase in the atmospheric concentration of SO2 and NO2. These mix with water vapour to form sulphuric acid (H2SO4) and nitric acid (HNO3) respectively which falls on earth in the form of acid rain. 

1326 Views

83.

Satellite DNA is important because it

  • codes for proteins needed in cell cycle.

  • shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

  • does not code for proteins and is same in all members of the population.

  • does not code for proteins and is same in all members of the population.


B.

shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

Satellite DNA forms that minor peak after centrifugation of DNA. These are repetitive DNA sequences that do not code for any protein. They show high degree of polymorphism and heritable from parents to children, thus form the basis of DNA fingerprinting. 

1094 Views

84.

Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of 

  • food

  • light

  • essential minerals

  • essential minerals


D.

essential minerals

Eutrophication is a process where water bodies receive excess nutrients that stimulate excessive plant growth. This can lead to overcrowding and competition for sunlight, space and oxygen.
This condition creates the lacking of essential nutrients for fishes due to which they die. 

1418 Views

85.

Grafted kidney may be rejected in a patient due to

  • Humoral immune response

  • Cell-mediated immune response

  • Passive immune response

  • Passive immune response


B.

Cell-mediated immune response

Grafted kidney may be rejected in a patient due to the cell-mediated immune response that is mediated by T-lymphocytes. The body is able to differentiate 'self' and 'non-self'. Therefore, tissue matching, blood group matching are essential before undertaking any graft/transplant and even after this the patient has to take immuno-suppressants all his/her life. 

1288 Views

86.

Which of the following diseases is caused by a protozoan?

  • Syphilis

  • Influenza

  • Babesiosis

  • Babesiosis


C.

Babesiosis

Babesiosis is a malaria-like parasitic disease caused by infection with Babesia bigemina, a genus of protozoa piroplasms. 
Syphilis -  Treponema pallidum (bacterium)
Influenza - Influenza virus
Blastomycosis - Blastomyces dermatitidis (fungus) 

1297 Views

87.

A pleiotropic gene

  • is expressed only in primitive plants.

  • is a gene evolved during Pliocene

  • controls a trait only in combination with another gene

  • controls a trait only in combination with another gene


D.

controls a trait only in combination with another gene

Pleiotropic gene is a gene that controls multiple traits is an individual. It is also called polyphenic gene, e.g., phenylketonuria causing multiple adverse effects due to the mutation in a single gene coding for enzyme phenylalanine hydroxylase.

767 Views

88.

Which one of the following fruits is parthenocarpic?

  • Brinjal

  • Apple

  • Jackfruit

  • Jackfruit


D.

Jackfruit

Parthenocarpy is a process of developing fruits without involving fertilisation/seed formation. Therefore, the seedless varieties of economically important fruits like orange, banana, watermelon, lemon, etc. are produced using this technique. This technique involves inducing fruit formation by the application of plant growth hormones such as auxins. 

1160 Views

89.

In which of the following interactions both partners are adversely affected?

  • Competition

  • Predation

  • Parasitism

  • Parasitism


A.

Competition

Competition is a negative interaction that occurs among organisms whenever two or more organisms require the same limited resource. 
                           Population Interactions
Species A          Species B               Name of interaction
+                          +                            Mutualism
-                           -                             Competition
+                          -                             Predation
+                          -                             Parasitism

1508 Views

90.

Male gametophyte in angiosperms produces

  • Two sperms and a vegetative cell

  • Single sperm and a vegetative cell

  • Single sperm and a two vegetative cells

  • Single sperm and a two vegetative cells


A.

Two sperms and a vegetative cell

Pollen grain or male gametophyte in angiosperms contain one generative cell. The generative cell. The generative cell further divides mitotically to form two male gametes(sperms). So, a mature male gametophyte in angiosperms contains two sperms and one vegetative cell. 

938 Views