NCERT Class 12 Biology very short Questions & Answers

NCERT Class 12 Biology very short Questions & Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology very short Questions & Answers

31 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?
A auto-immune response
B humoral immune response
C physiological immune response
D cell-mediated immune response

Answer: cell-mediated immune response
32 Many diseases can be diagnosed by observing the symptoms in the patient. Which group of symptoms are indicative of pneumonia?
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
33 The substance produced by a cell on viral infection that can protect other cells from further infection is
A interferon
B histamine
C serotonin
D colostrum

Answer: interferon
34 Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because
A gametes of parents have qualitatively different genetic composition
B greater amount of DNA is involved in sexual reproduction.
C sexual reproduction is a lengthy process
D genetic material comes from parents of two different species

Answer: gametes of parents have qualitatively different genetic composition
35 Sugarcane is propagated by
A stem cutting
B seeds
C leaf buds
D root cutting

Answer: stem cutting
36 External fertilisation occurs in majority of
A algae
B mosses
C fungi
D liverworts

Answer: algae
37 In animals, juvenile phase is followed by,
A reproductive phase
B senescent phase
C old age
D vegetative phase.

Answer: reproductive phase
38 Vegetative propagation in Pistia occurs by
A offset
B rhizome
C sucker
D runner

Answer: offset
39 A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has
A diploid vegetative cells and haploid gametangia
B haploid vegetative cells and haploid gametangia
C diploid vegetative cells and diploid gametangia
D haploid vegetative cells and diploid gametangia

Answer: haploid vegetative cells and haploid gametangia
40 In the lac operon of E.coli, the i gene codes for
A inducer
B repressor
C lactase
D β-galactosidase

Answer: repressor

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