CUET 2026 Biology May 25 Shift 1 Question Paper- Download Answer Key and Solution PDF

Which of the following hormones is not produced by the placenta?

• (A) \( hCG \)
• (B) \( hPL \)
• (C) \( Thyroxine \)
• (D) \( Estrogen \)

In the following statements, identify the stages of oogenesis in the order in which they occur:


[(A)] During fertilisation, formation of egg and second polar body.
[(B)] Meiosis II commences but stops at metaphase II.
[(C)] Meiosis I commences but stops at prophase I.
[(D)] Formation of primary oocyte from oogonia.
[(E)] Meiosis I completes and results in formation of secondary oocyte and first polar body.

• (A) (D), (C), (B), (E), (A)
• (B) (C), (E), (D), (A), (B)
• (C) (D), (C), (E), (B), (A)
• (D) (D), (C), (A), (E), (B)

Select the correct statement/s from the following:


[A.] Spermatogonia always undergo meiotic cell division.
[B.] Primary spermatocytes divide by mitotic cell division.
[C.] Secondary spermatocytes have 23 chromosomes and undergo second meiotic division.
[D.] Spermatozoa are transformed into spermatids.

• (A) A and C only
• (B) C only
• (C) D only
• (D) B and C only

Arrange the following events in correct sequence:


[A.] Formation of zygote
[B.] Formation of blastocyst
[C.] Implantation
[D.] Formation of morula

• (A) A, D, B, C
• (B) A, B, D, C
• (C) A, B, C, D
• (D) C, D, B, A

Which among the following hormones is not produced by placenta?

• (A) Human Chorionic Gonadotropin (hCG)
• (B) Human Placental Lactogen (hPL)
• (C) Estrogens
• (D) Relaxin

A primary spermatocyte after first meiotic division leads to the formation of secondary spermatocytes. These are:

• (A) Two equal haploid cells
• (B) Two unequal haploid cells
• (C) Two diploid cells
• (D) Four diploid cells

A pregnant female was admitted to the labour room. Mild uterine contractions started, but further strong uterine contractions were not taking place. Which of these could a doctor inject to induce delivery?

• (A) Oxytocin
• (B) Vasopressin
• (C) Relaxin
• (D) Prolactin

Spermatogenesis starts at the age of puberty due to a significant increase in secretion of Gonadotropin Releasing Hormone (GnRH). Increased levels of GnRH stimulate the secretion of two gonadotropins which are:

• (A) Luteinising Hormone and Androgens
• (B) Follicle Stimulating Hormone and Androgens
• (C) Luteinising Hormone and Follicle Stimulating Hormone
• (D) Luteinising Hormone and Testosterone

Select the correct sequence of events in human spermatogenesis:


[(A)] Spermatid
[(B)] Spermatogonia
[(C)] Spermatozoa
[(D)] Secondary Spermatocytes
[(E)] Primary Spermatocytes

• (A) (B), (E), (D), (A), (C)
• (B) (E), (D), (B), (C), (A)
• (C) (B), (E), (D), (C), (A)
• (D) (B), (D), (E), (A), (C)

Which of the following statements are correct about the structure of a sperm?


[A.] It is composed of head, thorax, neck and tail.
[B.] The neck region contains a lot of mitochondria.
[C.] The mitochondria produce energy for the movement of the tail.
[D.] The tail facilitates sperm motility essential for fertilization.

• (A) A and B only
• (B) B and C only
• (C) C and D only
• (D) B and D only