NCERT Class 12 Biology Multiple Choice Questions(MCQs) & Answers

NCERT Class 12 Biology Multiple Choice Questions(MCQs) & Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology Multiple Choice Questions(MCQs) & Answers

21 If a haemophilic woman marries a normal man,
A all their children will be normal.
B all their sons will be haemophilic.
C all their daughters will be haemophilic.
D 50% sons and 50% daughters will be haemophilic.

Answer: all their sons will be haemophilic.
22 Operon model for regulation of transcription was proposed by
A Meselson and Stahl
B Jacob and Monod
C Watson and Crick
D Hershey and Chase

Answer: Jacob and Monod
23 Which of the following are the functions of RNA?
A It is a constituent component of ribosomes
B It carries amino acids to ribosomes
C It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
D All of the above.

Answer: All of the above.
24 There is no natural death in single celled organisms like Amoeba and bacteria because
A they are microscopic
B parental body is distributed among the offspring
C they reproduce by binary fission
D they cannot reproduce sexually

Answer: parental body is distributed among the offspring
25 From his long term ecosystem experiments, David Tilman showed that
A decreased diversity contributed to higher productivity
B decreased diversity contributed to decreased productivity
C increased diversity contributed to increased productivity
D increased diversity contributed to decreased productivity

Answer: increased diversity contributed to increased productivity
26 The most significant feature of vegetative propagation is that
A it is a method of producing a large number of individuals genetically identical to the parent.
B it is a method of producing a large number of individuals genetically different from the parent.
C it ensures that the progeny individuals are resistant to diseases and pests.
D it is an age old practice.

Answer: it is a method of producing a large number of individuals genetically identical to the parent.
27 Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
A 2-10%
B 50%
C Less than 1%
D 30%

Answer: 2-10%
28 Which of the following ecosystems is most productive in terms of net primary production?
A Estuaries
B Deserts
C Tropical rain forests
D Oceans

Answer: Tropical rain forests
29 The terms homothallic and monoecious are used to denote
A unisexual condition
B bisexual condition
C staminate flowers
D pistillate flowers.

Answer: bisexual condition
30 Which of the following organisation is responsible for maintaining the Red Data Book?
A IUCN
B USDA
C IDRI
D All of these

Answer: IUCN

    More Questions Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12

Comments