Nokea
The ________ is an ovoviviparous animal.
- A. Basking shark
- B. Bonobo
- C. Blue shark
- D. None of the above
Correct Answer: A
Rationale: The correct answer is A: Basking shark. Ovoviviparous animals are those that produce eggs that hatch inside the mother's body, giving birth to live young. Basking sharks exhibit this reproductive strategy, making them ovoviviparous.
Explanation of incorrect choices:
B: Bonobos are primates and give birth to live young, but they are not ovoviviparous.
C: Blue sharks give birth to live young as well, but they are not ovoviviparous.
D: "None of the above" is incorrect as the basking shark is indeed an ovoviviparous animal, making it the correct answer.
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The fecundated spermatozoon contains:
- A. 11 pairs of somatic chromosomes;
- B. 22 somatic chromosomes ;
- C. only the X sex chromosome;
- D. the X or Y sex chromosome
Correct Answer: D
Rationale: The correct answer is D because the fecundated spermatozoon can contain either the X or Y sex chromosome, determining the genetic sex of the offspring. Spermatozoa are haploid cells, meaning they contain only one set of chromosomes. During fertilization, the spermatozoon fuses with the ovum, which also contains a single set of chromosomes, resulting in a diploid zygote with a complete set of chromosomes. Choices A and B are incorrect as somatic chromosomes refer to the non-reproductive cells in the body, not the chromosomes found in gametes. Choice C is incorrect because the spermatozoon can carry either the X or Y sex chromosome, not exclusively the X chromosome.
What is the function of the milky-colored fluids secreted from the prostate?
- A. Enable sperm to swim
- B. Activate sperm
- C. Cleanse the urethra
- D. Neutralize urine
Correct Answer: C
Rationale: The milky-colored fluid secreted from the prostate cleanses the urethra. This fluid helps neutralize the acidity of the urethra, providing a more suitable environment for sperm to survive. It does not enable sperm to swim or activate them, as these functions are performed by other components of semen. Additionally, it does not neutralize urine, as its primary function is to support sperm survival and motility.
The scrotum:
- A. is located above the external male genital organ;
- B. shelters the male gonad;
- C. is made up of concentric tunics, a continuation of the ones from the anterior abdominal wall;
- D. is part of the external genital organs;
Correct Answer: B
Rationale: The correct answer is B: shelters the male gonad. The scrotum houses and protects the testes, the male gonads responsible for sperm production. This is crucial for maintaining optimal temperature for spermatogenesis. Choices A, C, and D are incorrect as the scrotum is located below the external male genital organ, has separate tunics from the abdominal wall, and is considered part of the external genital organs.
The process when the ovarian follicle ruptures and releases an ovum is called ___________.
- A. Menopause
- B. ovulation
- C. Implantation
- D. Breast
Correct Answer: B
Rationale: The correct answer is B: ovulation. Ovulation is the process where the ovarian follicle ruptures and releases an ovum. This occurs around the middle of the menstrual cycle. Menopause (A) is the cessation of menstrual periods, not the release of an ovum. Implantation (C) is the attachment of a fertilized egg to the uterine wall, not the release of an ovum. Breast (D) is not related to the process of ovulation.
Which of these is not produced by the placenta?
- A. estrogen
- B. relaxin
- C. progesterone
- D. lactogen
Correct Answer: B
Rationale: The correct answer is B: relaxin. The placenta produces estrogen, progesterone, and lactogen to support pregnancy. Relaxin is primarily produced by the corpus luteum and later by the placenta. However, it is not exclusively produced by the placenta, making it the correct choice. Estrogen is crucial for fetal development and maintaining pregnancy. Progesterone helps in preparing the uterus for implantation and supporting the pregnancy. Lactogen (human placental lactogen) plays a role in regulating maternal metabolism and fetal growth.