CBSE 12 Biology Question Paper-2025 Set-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Biology Question Paper-2025 Set-1
CBSE 12 Biology Question Paper-2025 Set-1

CBSE 12 Biology Question Paper-2025 Set-1

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2025 set-1, helping students understand exam trends and practice real paper format

2025-08-19
Pavan Pavan
CBSE Class 12 Biology 2025 Grade 12

Duration

20 min

Questions

16

Marking

Negative

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Questions Preview

Which of the following does not possess 'n' number of chromosomes?

A
Spermatogonium
B
Ovum
C
Spermatozoon
D
Secondary spermatocyte

Which of the following organisms exhibit external fertilization?

A
Reptiles
B
Birds
C
Fishes
D
Mammals

Which of the following is an example of an amphibious plant?

A
Typha
B
Lotus
C
Hydrilla
D
Pistia

The gene for hemophilia is located on:

A
X-chromosome
B
Y-chromosome
C
Autosomes
D
Autosomes and X-chromosome

The phenomenon of crossing over occurs during:

A
prophase I of meiosis
B
anaphase I of meiosis
C
prophase of mitosis
D
anaphase of mitosis

Sickle-cell anemia is a classic example of:

A
Point mutation
B
Frame-shift mutation
C
Chromosomal aberration
D
Polyploidy

Assertion (A): Methane is the major component of biogas. Reason (R): Methane is produced by methanogens during anaerobic digestion.

A
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
B
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
C
Assertion (A) is true, but Reason (R) is false.
D
Assertion (A) is false, but Reason (R) is true.

Assertion (A): The use of DDT has been banned in many countries. Reason (R): DDT causes biomagnification.

A
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
B
Assertion (A) is false, but Reason (R) is true.
C
Assertion (A) is true, but Reason (R) is false.
D
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Assertion (A): DNA replication is semiconservative. Reason (R): After DNA replication, each DNA molecule has one old strand and one new strand.

A
Assertion (A) is true, but Reason (R) is false.
B
Assertion (A) is false, but Reason (R) is true.
C
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
D
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Assertion (A): DNA fingerprinting is a very powerful technique to identify individuals. Reason (R): The size of the DNA fragments generated after cutting with restriction enzyme is the same in all individuals.

A
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
B
Assertion (A) is true, but Reason (R) is false.
C
Assertion (A) is false, but Reason (R) is true.
D
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Which of the following is a classic example of a point mutation?

A
Sickle-cell anemia
B
Frame-shift mutation
C
Chromosomal aberration
D
Polyploidy

The gene for hemophilia is located on:

A
X-chromosome
B
Y-chromosome
C
Autosomes
D
Both A and C

The phenomenon of crossing over occurs during:

A
prophase I of meiosis
B
anaphase I of meiosis
C
prophase of mitosis
D
anaphase of mitosis

Which of the following organisms exhibit external fertilization?

A
Fishes
B
Reptiles
C
Birds
D
Mammals

Which of the following does not possess 'n' number of chromosomes?

A
Ovum
B
Spermatogonium
C
Spermatozoon
D
Secondary spermatocyte

Which of the following is an example of an amphibious plant?

A
Hydrilla
B
Lotus
C
Pistia
D
Typha