Sample Question Paper 2023-24
Class XII
Biology (Subject Code-044)
Maximum Marks: 70 Time: 3 hours
General Instructions:
(i) All questions are compulsory.
(ii) The question paper has five sections and 33 questions. All questions are compulsory.
(iii) Section–A has 16 questions of 1 mark each; Section–B has 5 questions of 2 marks each; Section– C
has 7 questions of 3 marks each; Section– D has 2 case-based questions of 4 marks each; and
Section–E has 3 questions of 5 marks each.
(iv) There is no overall choice. However, internal choices have been provided in some questions. A
student has to attempt only one of the alternatives in such questions.
(v) Wherever necessary, neat and properly labeled diagrams should be drawn.
Section - A
Q.No. Question Marks
1 Remnants of nucellus are persistent during seed development in: 1
a) pea
b) groundnut
c) wheat
d) black pepper
2 The wall layer of microsporangium which nourishes the pollen grain is: 1
a) epidermis
b) endothecium
c) middle layers
d) tapetum
3 A short piece of DNA, having 20 base pairs, was analyzed to find the number of 1
nucleotide bases in each of the polynucleotide strands. Some of the results are
shown in the table.
Number of nucleotide bases
Adenine Cytosine Guanine Thymine
Strand 1 4 4
Strand 2 5
How many nucleotides containing Adenine were present in strand 2?
a) 2
b) 4
c) 5
d) 7
1
, In a certain species of insects, some have 13 chromosomes, and the others have
4 1
14chromosomes.The 13 and 14 chromosome bearing organisms are
a) males and females, respectively
b) females and males, respectively
c) all males
d) all females
At a particular locus, the frequency of allele A is 0.8 and that of allele a is 0.2.
5 1
What would be the frequency of heterozygotes in a random mating population at
equilibrium?
a) 0.32
b) 0.16
c) 0.24
d) 0.48
Variations caused due to mutations are
6 1
a) random and directionless
b) random and directional
c) random and small
d) random, small and directional
What is the smallest part of a DNA molecule that can be changed by a point
7 1
mutation?
a) Oligonucleotide
b) Codon
c) Gene
d) Nucleotide
8 What should be the genotype of the indicated member? 1
a) AA
b) Aa
c) XY
d) aa
2
Class XII
Biology (Subject Code-044)
Maximum Marks: 70 Time: 3 hours
General Instructions:
(i) All questions are compulsory.
(ii) The question paper has five sections and 33 questions. All questions are compulsory.
(iii) Section–A has 16 questions of 1 mark each; Section–B has 5 questions of 2 marks each; Section– C
has 7 questions of 3 marks each; Section– D has 2 case-based questions of 4 marks each; and
Section–E has 3 questions of 5 marks each.
(iv) There is no overall choice. However, internal choices have been provided in some questions. A
student has to attempt only one of the alternatives in such questions.
(v) Wherever necessary, neat and properly labeled diagrams should be drawn.
Section - A
Q.No. Question Marks
1 Remnants of nucellus are persistent during seed development in: 1
a) pea
b) groundnut
c) wheat
d) black pepper
2 The wall layer of microsporangium which nourishes the pollen grain is: 1
a) epidermis
b) endothecium
c) middle layers
d) tapetum
3 A short piece of DNA, having 20 base pairs, was analyzed to find the number of 1
nucleotide bases in each of the polynucleotide strands. Some of the results are
shown in the table.
Number of nucleotide bases
Adenine Cytosine Guanine Thymine
Strand 1 4 4
Strand 2 5
How many nucleotides containing Adenine were present in strand 2?
a) 2
b) 4
c) 5
d) 7
1
, In a certain species of insects, some have 13 chromosomes, and the others have
4 1
14chromosomes.The 13 and 14 chromosome bearing organisms are
a) males and females, respectively
b) females and males, respectively
c) all males
d) all females
At a particular locus, the frequency of allele A is 0.8 and that of allele a is 0.2.
5 1
What would be the frequency of heterozygotes in a random mating population at
equilibrium?
a) 0.32
b) 0.16
c) 0.24
d) 0.48
Variations caused due to mutations are
6 1
a) random and directionless
b) random and directional
c) random and small
d) random, small and directional
What is the smallest part of a DNA molecule that can be changed by a point
7 1
mutation?
a) Oligonucleotide
b) Codon
c) Gene
d) Nucleotide
8 What should be the genotype of the indicated member? 1
a) AA
b) Aa
c) XY
d) aa
2
