Fertilization usually occurs in the nuclear division only. ______.

Correct Answer: D

Rationale: The correct answer is D because meiosis occurs in all cells of the body. Meiosis is a specialized type of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes. Fertilization, the fusion of sperm and egg, typically occurs after meiosis in the reproductive organs. Choices A, B, and C are incorrect because they do not directly relate to the process of fertilization or meiosis occurring in all cells. Choice A talks about the outcome of meiosis, choice B refers to a specific organ, and choice C mentions a stage in the development of an egg cell.

Correct Answer: B

Rationale: The correct answer is B because testosterone levels do rise after puberty and slowly decline throughout a male's life due to aging. This is because testosterone plays a crucial role in male development during puberty and is responsible for maintaining male characteristics. The other choices are incorrect as testosterone levels do not rise and fall every month (A), are not at their highest during gestation (C), and are not at their highest just after birth (D).

Correct Answer: B

Rationale: The correct answer is B because inhibin is primarily secreted by Sertoli cells in the testes, not Leydig cells. Testosterone actually stimulates the secretion of inhibin from Sertoli cells. In contrast, Leydig cells produce testosterone in response to luteinising hormone (Choice A). Testosterone does play a key role in inducing and maintaining male sexual functions (Choice C) and also stimulates protein anabolism and bone growth (Choice D). Thus, Choice B is incorrect as Leydig cells do not secrete inhibin.

Correct Answer: A

Rationale: The correct answer is A: Menopause. Menopause refers to the natural cessation of menstruation in middle-aged women, typically around the age of 45-55. It occurs due to declining levels of estrogen and progesterone hormones, leading to the end of reproductive capacity. Gestation (B) refers to pregnancy, not the cessation of menstruation. Implantation (C) is the process of a fertilized egg attaching to the uterus, not related to the end of menstruation. Uterus (D) is an organ involved in menstruation but does not specifically refer to the cessation of menstruation in middle age.

Correct Answer: B

Rationale: The correct answer is B: neonate. A neonate refers to a newborn baby within the first 28 days of life. The term is commonly used in medical contexts to describe infants right after birth. Rationale: 1. Obstetrician (Choice A): An obstetrician is a doctor who specializes in pregnancy, childbirth, and postpartum care. This term does not describe the baby itself. 2. Antenatal (Choice C): Antenatal refers to the period before birth, specifically during pregnancy. It does not describe the baby after birth. 3. Foetus (Choice D): A foetus is the term used for an unborn baby in the womb, not for a newborn baby after birth. In summary, the term "neonate" is the correct choice as it specifically refers to a newborn baby immediately after birth, while the other options do not accurately describe the baby at this stage.