Human reproduction practice · Medium

Option C (Acrosome) is the odd one out because endometrium, corpus luteum, and Graafian follicle are all parts of the female reproductive system, while the acrosome is a part of the sperm.

Option C (Cleavage is repeated mitotic division of zygote) is correct because cleavage is characterized by rapid mitotic divisions of the zygote, increasing the number of cells without increasing the overall size of the embryo.

Option D (Isthmus) is correct because the isthmus is part of the female reproductive system (fallopian tube), while the other structures are part of the male reproductive system.

Option C (It provides temperature that is slightly lower than body temperature required for formation of functional sperms) is correct because the scrotum maintains a lower temperature essential for spermatogenesis.

Option D (A- alveoli, B- milk, C-mammary duct) is correct because lobules contain alveoli that secrete milk, which then drains into mammary ducts.

Option A (Luteinizing hormone – failure of ovulation) is correct because LH is crucial for triggering ovulation, and its deficiency can lead to ovulation failure.

Option B (Allantois) is correct because the allantois functions as an excretory organ in developing amniotes, storing waste products.

Option B (Fallopian tube) is correct because fertilization in mammals typically occurs in the ampulla of the fallopian tube.

Option B (In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second) is correct because cleavage divisions are not always perfectly synchronous.

Option D (Sertoli cell) is correct because Sertoli cells, located within the seminiferous tubules of the testes, provide nourishment and support for developing sperm cells.

Option C (Corpus luteum) is correct because the corpus luteum secretes progesterone, which is essential for maintaining the endometrium and pregnancy.

Option D (Tail) is correct because the tail, also known as the flagellum, is the structure responsible for the sperm's motility.

Option A (I, II, III, IV) is correct because the correct sequence is Rete testes, Vasa efferentia, Epididymis, and Vasa deferentia.

Option A (A-Cowper’s, B-Urethra, C-Alkaline, D-Mucous) is correct because Cowper's glands (bulbourethral glands) are located on either side of the urethra and secrete an alkaline, mucous-rich fluid.

Option C (A-ectoderm, B-endoderm, C-mesoderm) is correct because after implantation, the inner cell mass differentiates into the ectoderm and endoderm, and mesoderm appears between them.

Option A (Cervical canal) is correct because the uterus opens into the vagina through the cervical canal.