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

CBSE 12 Biology Question Paper-2025 Set-3

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2025 set-3, 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

20

Marking

Negative

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Questions Preview

In its extended 'beads-on-string' form of chromatin, the 'beads' in the string represent:

A
Linker DNA
B
Histone proteins
C
Nucleosomes
D
NHC proteins

The 'beads' in the extended 'beads-on-string' form of chromatin are composed of:

A
Histones and linker DNA
B
Histones and about 200 bp of DNA
C
NHC proteins and linker DNA
D
NHC proteins and about 200 bp of DNA

In its extended 'beads-on-string' form of chromatin, the 'string' in the 'beads-on-string' represent:

A
Linker DNA
B
Histones
C
NHC proteins
D
200 bp of proteins

The statements below are related to the accessory ducts of the human male reproductive system:
(i) Seminiferous tubules of the testis open into vasa efferentia through rete testis which lead to vas deferens.
(ii) Vasa efferentia leave the testis and open into epididymis.
(iii) The epididymis leads to vas deferens which ascends to the abdomen.
(iv) Vas deferens receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct.
(v) The urethra extends through the penis and its external opening is called urethral meatus.
Choose the correct statement from the given options:

A
(i), (ii), (iv)
B
(ii), (iii), (v)
C
(i), (iii), (v)
D
(ii), (iv), (v)

Some statements regarding oogenesis in human females are given below:
(i) Unequal division of primary oocyte results in the formation of a large secondary oocyte and a tiny first polar body.
(ii) Oogonia are formed during embryonic development of a female fetus.
(iii) Oogonia divide by mitosis and enter prophase-I of meiotic division.
(iv) A large number of primary oocytes degenerate during the period from birth to puberty.
(v) A primary oocyte completes meiosis II on fertilization.
Choose the option with the correct statements:

A
(i), (ii) and (iv)
B
(ii), (iii) and (v)
C
(i), (ii) and (iii)
D
(i), (ii) and (v)

Some statements regarding the process of oogenesis in human females are given below:
(i) Oogonia are formed and added after birth.
(ii) Oogonia start division and enter the prophase-I stage of meiotic division.
(iii) At puberty, only 60,000-80,000 primary follicles are left in each ovary.
(iv) The first meiotic division is completed after fertilization.
(v) The second meiotic division is completed only on fertilization.
Choose the option with the correct statements:

A
(ii), (iii) and (iv)
B
(i), (iv) and (v)
C
(i), (ii) and (iii)
D
(ii), (iii) and (v)

The 'string' in the 'beads-on-string' form of chromatin represents:

A
Linker DNA
B
Histones
C
NHC proteins
D
200 bp of proteins

Some statements regarding the process of oogenesis in human females are given below:
(i) Oogonia are formed and added after birth.
(ii) Oogonia start division and enter the prophase-I stage of meiotic division.
(iii) At puberty, only 60,000-80,000 primary follicles are left in each ovary.
(iv) The first meiotic division is completed after fertilization.
(v) The second meiotic division is completed only on fertilization.
Choose the option with the correct statements:

A
(ii), (iii) and (v)
B
(i), (iv) and (v)
C
(i), (ii) and (iii)
D
(ii), (iii) and (iv)

Some statements regarding oogenesis in human females are given below:
(i) Unequal division of primary oocyte results in the formation of a large secondary oocyte and a tiny first polar body.
(ii) Oogonia are formed during embryonic development of a female fetus.
(iii) Oogonia divide by mitosis and enter prophase-I of meiotic division.
(iv) A large number of primary oocytes degenerate during the period from birth to puberty.
(v) A primary oocyte completes meiosis II on fertilization.
Choose the option with the correct statements:

A
(i), (ii) and (v)
B
(ii), (iii) and (v)
C
(i), (ii) and (iii)
D
(i), (ii) and (iv)

The statements below are related to the accessory ducts of the human male reproductive system:
(i) Seminiferous tubules of the testis open into vasa efferentia through rete testis which lead to vas deferens.
(ii) Vasa efferentia leave the testis and open into epididymis.
(iii) The epididymis leads to vas deferens which ascends to the abdomen.
(iv) Vas deferens receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct.
(v) The urethra extends through the penis and its external opening is called urethral meatus.
Choose the correct statement from the given options:

A
(ii), (iii), (v)
B
(i), (ii), (iv)
C
(i), (iii), (v)
D
(ii), (iv), (v)

Meiosis II occurs during the division of:

A
Primary spermatocytes and spermatogonia
B
Secondary spermatocytes and secondary oocytes
C
Primary oocytes and spermatids
D
Secondary oocytes and primary spermatocytes

Some statements regarding spermatogenesis are given below:
(i) It starts at puberty due to the significant increase in the secretion of GnRH.
(ii) It occurs in the seminiferous tubules of the testis.
(iii) The spermatogonia divide mitotically and meiotically to form the haploid spermatids.
(iv) Spermatids are transformed into spermatozoa by the process of spermiogenesis.
(v) Luteinizing Hormone (LH) acts on Sertoli cells and stimulates the secretion of androgens.
Choose the correct statements from the given options:

A
(i), (iii) and (iv)
B
(ii), (iii) and (v)
C
(i), (ii) and (iv)
D
(i), (iv) and (v)

Meiosis II occurs during the division of:

A
Primary spermatocytes and spermatogonia
B
Secondary spermatocytes and secondary oocytes
C
Primary oocytes and spermatids
D
Secondary oocytes and primary spermatocytes

Some statements regarding spermatogenesis are given below:
(i) It starts at puberty due to the significant increase in the secretion of GnRH.
(ii) It occurs in the seminiferous tubules of the testis.
(iii) The spermatogonia divide mitotically and meiotically to form the haploid spermatids.
(iv) Spermatids are transformed into spermatozoa by the process of spermiogenesis.
(v) Luteinizing Hormone (LH) acts on Sertoli cells and stimulates the secretion of androgens.
Choose the correct statements from the given options:

A
(i), (iii) and (iv)
B
(ii), (iii) and (v)
C
(i), (ii) and (iv)
D
(i), (iv) and (v)

A man with blood group B marries a woman with blood group A. The parents have a child with blood group O. Choose the genotype of the parents:

A
Mother: IᴬIᴬ, Father: IᴮIᴮ
B
Mother: Iᴬi, Father: IᴮIᴮ
C
Mother: Iᴬi, Father: Iᴮi
D
Mother: IᴬIᴮ, Father: ii

Study the given pedigree chart and choose the correct option:

A
The trait is recessive.
B
The trait is Y-linked.
C
The trait is sex-linked.
D
The trait is dominant.

What happens during the first meiotic division in oogenesis?

A
It is completed after fertilization.
B
It starts during embryonic development and is completed at puberty.
C
It is completed only on fertilization.
D
It is an unequal division resulting in a large secondary oocyte and a tiny first polar body.

The male accessory glands of humans include:

A
Seminal vesicles, Prostate gland and Bulbourethral glands
B
Seminal vesicles, Bulbourethral glands and a pair of testis
C
Prostate gland, Urethra and Bulbourethral glands
D
Prostate gland, Seminal vesicles and Urethra

Which of the following is a symptom of Gonorrhoea?

A
Painful urination
B
Pelvic inflammatory diseases
C
Stillbirth
D
Abnormal discharges

Which of the following sexually transmitted diseases is caused by a protozoan?

A
Gonorrhoea
B
Syphilis
C
Trichomoniasis
D
Hepatitis B