CBSE Class 12 Biology Quiz | CBSE Class 12 Biology Multiple Choice Questions(MCQs) with Answers

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Questions
61 Niche is defined as
A a component of an ecosystem
B an ecologically adapted zone of a species
C the physical position and functional role of a species within the community
D all plants and animals living at the bottom of a water body.

Answer: the physical position and functional role of a species within the community
62 Animals from colder climates generally have shorter limbs. This is called
A Allen’s rule
B Niche rule
C Johnson’s rule
D Arber’s rule

Answer: Allen’s rule
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63 Cyanobacteria are used as biofertilisers because they
A are photosynthetic
B grow easily anywhere
C have mucilage
D fix atmospheric nitrogen

Answer: fix atmospheric nitrogen
64 Methanogens, growing anaerobically on cellulosic material, produce
A methane, carbon dioxide, hydrogen.
B methane and hydrogen
C methane and carbon dioxide
D methane gas

Answer: methane, carbon dioxide, hydrogen.
65 The residue left after methane production from cattle dung is
A used as manure
B used in civil construction.
C burnt
D burned in land fills

Answer: used as manure
66 The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is [NCERT Exemplar]
A vitamin B12
B vitamin E.
C vitamin C
D vitamin D

Answer: vitamin B12
67 BOD of waste water is estimated by measuring the amount of [NCERT Exemplar]
A oxygen evolution
B oxygen consumption
C total organic matter
D biodegradable organic matter

Answer: oxygen consumption
68 Which one of the following is not a nitrogenfixing organism? [NCERT Exemplar]
A Pseudomonas
B Azotobacter
C Anabaena
D Nostoc

Answer: Pseudomonas
69 The primary treatment of waste water involves the removal of [NCERT Exemplar]
A stable particles
B harmful bacteria.
C dissolved impurities
D toxic substances

Answer: stable particles
70 Propionibacterium produces large holes in swiss cheese due to the
A formation of large amount of CO2
B consumption of carbohydrates
C process of oxidation of the dough
D all of these

Answer: formation of large amount of CO2
71 Bacillus thuringiensis is used to control
A insect pests
B bacterial pathogens
C fungal pathogens
D nematodes

Answer: insect pests
72 Lactic acid is formed by the process of
A fermentation
B glycolysis
C citric acid cycle
D P-oxidation

Answer: fermentation
73 Which one of the following combination would a sugarcane farmer look for in the sugarcane crop?
A Thick stem, long intemodes, high sugar content and disease resistant.
B Thick stem, low sugar content, disease resistant.
C Thick stem, high sugar content and profuse flowering.
D Thick stem, short intemodes, high sugar content, disease resistant.

Answer: Thick stem, long intemodes, high sugar content and disease resistant.
74 The biggest constraint of plant breeding is
A availability of desirable gene in the crop and its wild relatives.
B infrastructure.
C trained manpower.
D transfer of genes from unrelated sources.

Answer: availability of desirable gene in the crop and its wild relatives.
75 Inbreeding is carried out in animal husbandry because it
A increases heterozygosity.
B increases homozygosity.
C increases vigour.
D improves the breed.

Answer: increases homozygosity.
76 Breeding of crops to increase the levels of essential nutrients, is called
A biotechnology.
B biofortification.
C biomagnification.
D bioinformatics.

Answer: biofortification.
77 The technique of obtaining a large number of plantlets by tissue culture method is known as
A organ culture.
B micropropagation.
C plantlet culture.
D macropropagation.

Answer: micropropagation.
78 Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections? [NCERT Exemplar]
A auto-immune response
B humoral immune response
C physiological immune response
D cell-mediated immune response

Answer: cell-mediated immune response
79 Many diseases can be diagnosed by observing the symptoms in the patient. Which group of symptoms are indicative of pneumonia? [NCERT Exemplar]
A High fever, weakness, stomach pain, loss of appetite and constipation
B Constipation, abdominal pain, cramps, blood clots
C Difficulty in respiration, fever, chills, cough, headache
D Nasal congestion and discharge, cough, sorethroat, headache

Answer: Difficulty in respiration, fever, chills, cough, headache
80 The substance produced by a cell on viral infection that can protect other cells from further infection is [NCERT Exemplar]
A interferon
B histamine
C serotonin
D colostrum

Answer: interferon

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