CBSE Class 12th Biology Exam Question Paper

Will you please provide the question paper of CBSE Class 12th Biology Exam ?

[Kiran Chandar]

Here is the list of few questions of CBSE Class 12th Biology Exam Question Paper
which you are looking for .

Answer the following question in relation to the human genomic project: (2)
(a) Name the non human model (free living non-pathogenic nematode) whose gene
has been sequenced.
(b) Write the total and last chromosome has been sequenced.

Is it possible that this pedigree given below is for an autosomal dominant trait? Explain
and write the possible genotype of the parent and the progeny.

How does the study of different parts of a flower help in identifying wind as its
pollinating agent?

A cross was carried out between a pea plant heterozygous for round and yellow seeds
with a pea plant having wrinkled and green seeds. (3)
(a) Show the cross in a Punnett square.
(b) Write the phenotype of the progeny of this cross.
(c) What is this cross known as? What conclusion can you draw from the above
result?

Study the given chart below and answer the questions that follow: (3)
(a) S strai → i to i e → i e die
(b) ‘ strai → i to i e → i e li e.
(c) Heat killed S strain + live R strain into mice A
(d) Heat killed S strain + DNase + live R strain into mice B
i. Name the organism and differentiate between its two strains R and S
respectively.
ii. Write the results A and B obtained in step (c) and (d) respectively.
iii. Name the Scientist who performed the steps (a), (b) and (c).

What is incomplete dominance? Explain with one example. How it differs from complete
dominance. (3)

Answer the following questions: (3)

a. Draw a diagram of antibody and label its two parts.
b. Name the cell that produces this molecule.

Answer the following question in relation to transcription and translation: (3)
(a) Write the full form of hnRNA.
(b) Name the enzyme synthesize it.
(c) Name the enzyme which catalyzes the peptide bond formation.

The following is the flow chart highlighting the steps in DNA fingerprinting
technique. Identify a, b, c, d, e, and f.
(3)
Isolation of DNA from the blood cell

Cutting of DNA by ‘a’

Separation of DNA fragments by using ‘b’

Transfer (blotting) of fragments to ‘c’

DNAs split into single strands.

Introduction of labeled‘d’

‘e’ single strands with ‘d’

Detection of banding pattern by ‘f’

The outline structure of a drug is given below. (3)
(a) Which group of drugs does this represent?
(b) What are the modes of consumption of these drugs?
(c) Name the organ of the body which is affected by consumption of these drugs.