Organisation : Council For The Indian School Certificate Examinations
Class : Class XII
Document Type : Specimen Question Paper
Subject : Biology
Semester : 1 And 2
Year : 2022
Website : https://cisce.org/publications.aspx
ICSE Class XII Biology Question Paper
Council For The Indian School Certificate Examinations (ICSE) Class XII Biology Specimen Question Papers Semester 1 and 2 for the year 2022.
Related / Similar Question Paper : ICSE Class XII Home Science Question Paper 2022
ICSE Class XII Biology Questions
Question 1
Which of the following steps in transcription is catalysed by RNA polymerase?
(a) Initiation
(b) Elongation
(c) Termination
(d) All of the above
Question 2
In a DNA strand the nucleotides are linked together by
(a) glycosidic bonds
(b) phosphodiester bonds
(c) peptide bonds
(d) hydrogen bonds
Question 3
If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be
(a) 5’ – AUG A AUG – 3’
(b) 5’ – UACUU AC – 3’
(c) 5’ – CAUUCAU – 3’
(d) 5’ – GUAAGUA – 3’
Question 4
In E. coli the lac operon gets switched on when
(a) lactose is present and it binds to the repressor
(b) repressor binds to operator
(c) RNA polymerase binds to the operator
(d) lactose is present and it binds to RNA polymerase
Question 5
The amino acid attaches to the tRNA at its
(a) 5’- end
(b) 3’ – end
(c) anticodon site
(d) DHU loop
Question 6
Which of the following provides the most satisfactory evidence in the favour of the organic evolution?
(a) Fossils
(b) Neoteny
(c) Connecting links
(d) None of above
Question 7
Which era is dubbed as the age of prokaryotic microbes?
(a) Phanerozoic
(b) Proterozoic
(c) Precambrian
(d) Archeozoic
Question 8
The presence of gill slits in the embryos of all vertebrates supports the theory of
(a) Recapitulation
(b) Organic evolution
(c) Metamorphosis
(d) Biogenesis
Question 9
In Miller’s experiment, the gaseous mixture in the flask contained
(a) Methane, ammonia, carbon dioxide and helium
(b) Carbon dioxide, hydrogen, water vapour and ammonia
(c) Ammonia, methane, hydrogen and water vapour
(d) Hydrogen, ammonia and methane and helium
Question 10
Neo–Darwinism is
(a) Natural selection theory
(b) Modern mutation theory
(c) Modern synthetic theory
(d) Population theory
Question 11
Trichoderma, free living fungi, present in root ecosystem are useful as
(a) Biofertilizer
(b) Biopesticides
(c) Methanogens
(d) Vector for genetic engineering
Question 12
During spermatogenesis, the second maturation division results in the formation of
(a) 8 haploid spermatids
(b) 2 diploid spermatids
(c) 4 haploid spermatids
(d) 16 haploid spermatids
Question 13
What is the effect of high pH on sperm?
(a) High activity leading to early death
(b) Sluggish, longer life
(c) High activity, longer life
(d) No effect
Question 14
If temperature is reduced to 0°C, what will happen to spermatozoa?
(a) All will die
(b) No change
(c) Shedding of tail
(d) Temporary inactivation
Question 15
Select the incorrect statement about gametes
(a) Sperm begin developing before puberty
(b) Sperm do not develop successfully at 37°C
(c) Sperm are made in the seminiferous tubules
(d) Sperm are capable of movement
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