The development strategy where the young develop within their mother's uterus and obtain nourishment from the mother via placenta is best described as

Correct Answer: B

Rationale: The correct answer is B: Viviparity. Viviparity refers to the development strategy where young develop within the mother's uterus and receive nourishment through the placenta. This is the best description for the scenario provided. A: Oviparity involves laying eggs externally. C: Semelparity is a reproductive strategy where an organism reproduces only once in its lifetime. D: Ovoviviparity is a combination of oviparity and viviparity, where eggs are retained within the mother's body until they hatch.

Correct Answer: B

Rationale: The correct answer is B because the ductus deferens penetrates the prostate gland to connect with the prostatic urethra, forming the ejaculatory duct. This allows for the transport of sperm from the epididymis to the urethra during ejaculation. A: Dartos muscle is responsible for wrinkling the scrotal skin but not raising and lowering the testes. C: The anterior lobe of the prostate gland mainly consists of fibromuscular tissue, not glandular tissue. D: Buck's fascia surrounds the corpora cavernosa and the corpus spongiosum of the penis, not the body of the penis itself.

Correct Answer: A

Rationale: The correct answer is A because the respiratory bud does indeed start to appear at the ventral wall of the foregut around week 10 of gestation. This marks the beginning of respiratory system development. Choice B is incorrect as there are actually 5 stages of respiratory system development. Choice C is also incorrect as the development of the respiratory tract is not fully complete until after birth, not just in the last week of fetal development. Choice D is incorrect because the epithelial respiratory lining is derived from endoderm, not endodermal.

Correct Answer: B

Rationale: The correct answer is B: testis. The testis is the primary male sex organ responsible for producing sperm and testosterone. It is located within the scrotum. The penis (choice A) is the male reproductive organ used for sexual intercourse but is not the primary sex organ. The scrotum (choice C) is the external sac that houses the testes but is not the primary sex organ itself. The epididymis (choice D) is a coiled tube located on the testis where sperm mature and are stored, but it is not the primary sex organ.

Correct Answer: C

Rationale: The correct answer is C: secretion of alkaline mucus. The prostate gland produces alkaline mucus that helps neutralize the acidic environment of the vagina, thus enhancing sperm viability. Spermatogenesis (choice A) occurs in the testes, not the prostate. The production of glycogen (choice B) is not a function of the prostate. While the prostate does play a role in sperm transport and nourishment, it does not directly impact the maturation of sperm cells (choice D).