Which of the following statements is incorrect?

Correct Answer: A

Rationale: The correct answer is A because luteinising hormone (LH) and follicle stimulating hormone (FSH) are not secreted by the hypothalamus, but by the anterior pituitary gland. LH stimulates Leydig cells to produce testosterone, not the hypothalamus. Testosterone stimulates sertoli cells, not the other way around. Inhibin is indeed secreted by sertoli cells, but it does not relate to the incorrect statement regarding the origin of LH and FSH.

Correct Answer: B

Rationale: The correct answer is B: Ovum. The ovum is the mature female sex cell that unites with a male sperm during fertilization to form a zygote. Ovary (A) is the organ that produces eggs but is not the actual female sex cell. Gonad (C) is a general term for reproductive organs, not the specific female sex cell. Gametes (D) refer to both male and female sex cells, so it is a broad term and not the specific female sex cell. The ovum is the only choice that accurately represents the tiny female sex cell involved in fertilization.

Correct Answer: B

Rationale: The correct answer is B: ovaries. Ovaries are the organs responsible for producing, storing, and releasing human eggs. They are oval-shaped and play a crucial role in the female reproductive system. The other choices are incorrect because: A: clitoris is a small, sensitive organ located near the entrance of the vagina, not involved in egg production. C: Fallopian tubes are responsible for transporting eggs from the ovaries to the uterus, not for producing or storing eggs. D: Vagina is the muscular tube connecting the uterus to the outside of the body, not involved in egg production.

Correct Answer: C

Rationale: Rationale for correct answer (C): The main function of the testicles is spermatogenesis, which is the process of producing sperm cells. This is a crucial role in male reproductive system. Spermatogenesis occurs in the seminiferous tubules of the testes. Other functions like producing androgenic hormones (choice B) are mainly carried out by the Leydig cells in the testes, not the testicles themselves. While the testicles do play a role in semen production (choice D), this is not their primary function. Therefore, the correct answer is C as it directly relates to the main purpose of the testicles in the male reproductive system.

Correct Answer: C

Rationale: Step-by-step rationale for Choice C (Continues the epididymal duct) being the correct answer: 1. The deferent duct, also known as the vas deferens, is a continuation of the epididymal duct. 2. Sperm mature and are stored in the epididymis before passing into the vas deferens. 3. The vas deferens carries sperm from the epididymis to the ejaculatory duct during ejaculation. Summary: - Choice A is incorrect because the deferent duct does not join with the seminal vesicle duct to form the ejaculatory duct. - Choice B is incorrect as the vas deferens does not continue the rete testis. - Choice D is incorrect as the vas deferens is an intratesticular spermatic duct, not extratesticular.