CBSE
Board Central Board of Secondary Education [CBSE]
Class 12th / XII
Download Sample Question Paper 2023-24
Subject Biology
Document Type PDF
Official Website http://cbseacademic.nic.in/

CBSE Class XII Biology Sample Question Paper

Download Central Board of Secondary Education [CBSE] Class 12th Biology Sample Question Paper 2023-24 PDF Free Online

Download CBSE Class 12th All Subjects Sample Question Paper 2023-24 Here

Download CBSE Class XII Biology Sample Question Paper

Class XII Biology Sample Question Paper Download Here

CBSE Class XII Biology Sample Questions

1. Remnants of nucellus are persistent during seed development in:
a) pea
b) groundnut
c) wheat
d) black pepper

2. The wall layer of microsporangium which nourishes the pollen grain is:
a) epidermis
b) endothecium
c) middle layers
d) tapetum

3. In a certain species of insects, some have 13 chromosomes, and the others have 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

4. At a particular locus, the frequency of allele A is 0.8 and that of allele a is 0.2. 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

5. Variations caused due to mutations are
a) random and directionless
b) random and directional
c) random and small
d) random, small and directional

6. What is the smallest part of a DNA molecule that can be changed by a point mutation?
a) Oligonucleotide
b) Codon
c) Gene
d) Nucleotide

7.A patient was advised to have a kidney transplant. To suppress the immune reaction, the doctor would administer him:
a) statins produced from Monascus purpureus
b) statins produced from Streptococcus thermophilus
c) cyclosporin A produced from Trichoderma polysporum
d) cyclosporin A produced from Clostridium butylicum

8. The main objective of production of pest resistant GM crops is to
a) encourage eco-friendly pesticides
b) reduce pesticide accumulation in food chain
c) eliminate pests from the field without the use of manual labour
d) retain maximum nutritional content in the crop that would be otherwise consumed by pest

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