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Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

"Testis are extra-abdominal in position". Which of the following is most appropriate reason?

  1. Narrow pelvis in male

  2. Special protection for testis

  3. Prostate gland and seminal vesicles occupy maximum space
  4. $2.0-2.5^o$C lower than the normal body temperature.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To ensure the survival and growth of the sperms, testes have been placed outside the abdominal cavity within a pouch called scrotum so as to ensure the optimal temperature. The scrotum helps maintain the low temperature (by about 2-2.5 degrees than the normal body temperature) required for spermatogenesis. So, the correct option is '2.0−2.5o C lower than the normal body temperature'.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

In the case of a premature delivery ($8^{th}$-month) of a male baby the testes are situated in

  1. Scrotal Sac

  2. Abdominal cavity

  3. Descending pathway

  4. Come into scrotal sac but not attached properly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In the case of premature delivery, $8^{th}$-month) of a male baby the testis are situated in because of testes descent into the scrotum outside the body just before birth.
  • The testis is placed outside the body in scrotum because The scrotum helps in maintaining the low temperature of the testes (2–2.5°C lower than the normal internal body temperature) necessary for spermatogenesis. 
  • So, the correct answer is "Abdominal birth'.
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which of the following is incorrectly paired with its function ?

  1. Seminiferous tubules - add fluid containing mucus, fructose, and prostaglandins to semen

  2. Scrotum - encases testes and suspends them below abdominal cavity

  3. Epididymis - stores sperm

  4. Prostate gland - adds alkaline secretion to semen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Seminiferous tubules are present within the male testes. At seminiferous tubules, germination, maturation, and transportation of the sperm cells takes place. 
  • They are made up of columnar Sertoli cells. The scrotum is a sac of skin that encases the testes and suspends them below the abdominal cavity. It provides a slightly cooler temperature than the body temperature.
  •  Epididymis connects testicles to vas deference. It transports and stores sperm cells produced by testes. 
  • The prostate gland is present between the bladder and the penis. It secretes alkaline secretion to semen which protects and nourishes the sperm.

Thus, the correct answer is 'Seminiferous tubules - add fluid containing mucus, fructose, and prostaglandins to semen.'

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for?

  1. Escaping any possible compression by the visceral organs

  2. Providing more space for the growth of epididymis

  3. Providing a secondary sexual feature for exhibiting the male sex

  4. Maintaining the scrotal temperature lower than the internal body temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The sperms develop at a lower temperature than the internal body temperature which is 37 degree Celsius.
  • To maintain a lower temperature during spermatogenesis the testis descends in the scrotal sac outside of the abdominal cavity.
  • So, the correct option is 'Maintaining the scrotal temperature lower than the internal body temperature'.
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Find the incorrect statement w.r.t. male reproductive system.

  1. Each seminiferous tubule is lined on its inside by two types of cells called Male germ cells and Sertoli cells

  2. The urethra originated directly from the seminal vesicle and extends through the penis to its external opening called urethra meatus

  3. Leydig cells synthesize and secrete testicular hormones are called androgens

  4. Secretion of seminal vesicle is rich in fructose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The male testes are divided into compartments by the septa. Each testicular lobule contains s 1-3 highly coiled seminiferous tubules, blood vessels, and connective tissues. Each seminiferous tubules is line by germinal epithelium, the seminiferous tubule is the site of spermatogenesis. Sertoli or nurse cells are present that help in the nursing of the spermatozoa and their maturation. The sperms are then known as the male gametes.


So, the correct option is 'Each seminiferous tubule is lined on its inside by two types of cells called Male germ cells and Sertoli cells'

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

How many structures are found in the abdominal cavity of males among the following structures? Epididymis, Rete testis, Ampulla of vas deferens, Fallopian tube, Prostate gland, Seminal vesicle, Round ligament, Ureter, Membranous urethra

  1. $2$
  2. $3$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In males, the testes are extra-abdominal in position. The structure within the testes are not abdominal. So the rest structures are present in the abdominal cavity of the male like vas deferens, prostate gland, seminal vesicle, and membranous urethra.
So the correct answer is '4'.