NCERT Class 12 Biology Competitive Exams Questions and Answers

NCERT Class 12 Biology Competitive Exams Questions and Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology Competitive Exams Questions and Answers

81 The number of meiotic divisions, required to produce 400 seeds in a pea plant, is
A 500
B 400
C 100
D None of these

Answer: 500
82 Select the correct statement from the following options.
A Fitness is the end result of the ability to adapt and get selected by nature.
B Darwinian variations are small and direction less.
C Mutations are random and directional.
D All mammals have evolved vivipary as an adaptation.

Answer: Fitness is the end result of the ability to adapt and get selected by nature.
83 Change of frequency of alleles in a population results in evolution. This statement is proposed in
A Hardy-Weinberg principle
B de Vries theory.
C Darwin’s theory
D Lamarck’s theory

Answer: Hardy-Weinberg principle
84 Increase in cases of skin cancer and high mutation rate are the result of
A ozone depletion
B CO pollution
C acid rain ,
D CO2 pollution

Answer: ozone depletion
85 Polyblend was first developed by
A Ahmed Khan
B Indian Institute of Biology.
C Ramesh Chandra Dagar
D KhadiandVillagelndustriesCommission

Answer: Ahmed Khan
86 The thickness of ozone is measured as
A parts per billion
B Dobson units
C parts per million
D decibel.

Answer: Dobson units
87 The extinction of passenger pigeon was due to
A increased number of predatory birds.
B over exploitation by humans.
C non-availability of the food.
D bird flu virus infection.

Answer: over exploitation by humans.
88 In a pond ecosystem, the food chain starts with
A Zooplanktons.
B Small insects
C Phytoplanktons
D Small fishes

Answer: Phytoplanktons
89 Which of the following represents the sedimentary type of nutrient cycle?
A Nitrogen cycle
B Carbon cycle
C Phosphorus cycle.
D Oxygen cycle

Answer: Phosphorus cycle.
90 The enormous number of varieties of mango in India represents
A genetic diversity
B species diversity 1
C ecological diversity
D hybridisation programmes

Answer: genetic diversity

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