True / False Questions
Sexual reproduction entails the union of two gonads to form a zygote.
The presence of the Y chromosome guarantees the development of male secondary sex organs.
The mechanism that keeps the testes cooler than the body's core temperature is called descent
of the testes.
The scrotum contains the testes and spermatic cords.
Sperm travels along the ductus deferens before reaching the spermatic cord.
Sustentacular cells secrete inhibin, which regulates the rate of sperm production.
Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and
Erectile dysfunction prevents ejaculation in most cases.
At early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate
enlargement of the testes.
10. Spermiogenesis is the last stage of meiosis.
11. Sperm make up just 10% of semen volume.
12. Only germ cells undergo meiosis, which produces four haploid cells with 23 chromosomes each.
13. Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries
allowing blood to engorge the penis.
14. The first haploid stage of spermatogenesis is prophase II.
15. Myotonia of skeletal muscles is characteristic of the excitement phase and refractory period.
Multiple Choice Questions
16. _________ is/are generally accepted as a secondary sex characteristic.
A. The enlargement of the breasts
B. The presence of testes
C. The prostate gland
D. The uterus
E. The vagina
17. Which of the following are primary sex organs?
B. uterine tubes
E. scent glands
18. Which of the following is a secondary sex organ?
D. facial hair
E. distribution of body fat
19. Gonads begin to develop
A. 2 to 3 weeks after fertilization.
B. 5 to 6 weeks after fertilization.
C. 8 to 9 weeks after fertilization.
D. 20 to 24 weeks after fertilization.
E. at birth.
20. _____________ determine/s whether an organism will be
male or female.
A. Hormonal, genetic and environmental factors
B. Prenatal hormone exposure
C. The egg
D. The sperm
E. Both egg and sperm equally
21. The gene that codes for the testis-determining factor (TDF) is found in or on
A. the Y chromosome.
B. the X chromosome.
C. the gonadal ridges.
D. the fetal testes.
E. the mesonephros.
22. The penis is homologous to
A. the appendix.
B. a finger.
C. the urethra.
D. the vagina.
E. the clitoris.
23. The _____________ is the gonad and the ___________ is the gamete.
A. testis; ovary
B. testis; semen
C. testis; sperm
D. sperm; semen
E. semen; sperm
24. ________________ stimulates the descent of the testes.
A. The presence of Y chromosome
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