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

NCERT Class 12 Biology very short Questions & Answers

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