NCERT Class 12 Biology Short Questions & Answers

NCERT Class 12 Biology Short Questions & Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology Short Questions & Answers

1 BOD of waste water is estimated by measuring the amount of
A oxygen evolution
B oxygen consumption
C total organic matter
D biodegradable organic matter

Answer: oxygen consumption
2 Lactic acid is formed by the process of
A fermentation
B glycolysis
C citric acid cycle
D P-oxidation

Answer: fermentation
3 It natality is balanced by mortality in a population at a given time, there will be a/an
A decrease in the population size
B increase in the population size
C zero population growth
D population explosion

Answer: zero population growth
4 Mycorrhiza is an example of
A mutualism
B predation
C endoparasitism
D ectoparasitism

Answer: mutualism
5 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.
6 Which one of the following is not a nitrogenfixing organism?
A Pseudomonas
B Azotobacter
C Anabaena
D Nostoc

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

Answer: stable particles
8 Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because
A nodes have meristematic cells
B nodes have non-photosynthetic cells
C nodes are shorter than intemodes
D nodes are located near the soil

Answer: nodes have meristematic cells
9 In E.coli, the lac operon gets switched on when
A lactose is present and it binds to the », repressor.
B repressor binds to operator.
C RNA polymerase binds to the operator.
D lactose is present and it binds to RNA polymerase.

Answer: lactose is present and it binds to the », repressor.
10 There are various types of reproduction. The type of reproduction adopted by an organism depends on
A morphology and physiology of the organism
B the habitat and morphology of the organism
C the organism’s habitat, physiology, and genetic makeup
D morphology of the organism

Answer: the organism’s habitat, physiology, and genetic makeup

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