NCERT Class 12 Biology Objective type Questions & Answers

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

NCERT Class 12 Biology Objective type Questions & Answers

51 The net electric charge on DNA and histone, is
A positive, negative
B negative, positive
C positive, positive.
D negative, negative

Answer: negative, positive
52 The disease chikungunya is transmitted by
A houseflies
B cockroach
C Aedes mosquitoes
D female Anopheles

Answer: Aedes mosquitoes
53 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
54 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
55 Opium is extracted from
A Papaver somniferum
B Cannabis sativa
C Atropa belladona
D Erythroxylum coca

Answer: Papaver somniferum
56 Diacetyl morphine is commonly known as
A heroin
B cocaine
C hashish
D ganja

Answer: heroin
57 In an embryo sac, the cells that degenerate after fertilisation are:
A Synergids and primary endosperm cell.
B Synergids and antipodals.
C Antipodals and primary endosperm cell.
D Egg and antipodals.

Answer: Synergids and antipodals.
58 In a fertilised embryo sac, the haploid, diploid and triploid structures are:
A Synergid, polar nuclei and zygote.
B Synergid, antipodal and polar nuclei.
C Synergid, zygote and primary endosperm nucleus.
D Antipodal, synergid and primary endosperm nucleus.

Answer: Synergid, zygote and primary endosperm nucleus.
59 The immunoglobulin abundant in colostrum, is
A Ig A
B Ig M
C Ig D
D Ig G

Answer: Ig A
60 The letter T in T-lymphocytes refers to
A thymus
B thyroid
C tonsil
D thalamus

Answer: thymus

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