Tag: menstruation

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

The animal in which testes descend into scrotum only during breeding season is 

  1. Frog

  2. Kangaroo

  3. Shrew

  4. Bat
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In human males, the testes are situated outside the abdominal cavity within a pouch called scrotum. These type of testes is called extra-abdominal. Scrotum helps in maintaining the low temperature of the testes than the normal body temperature. It is necessary for sperm formation. But there are certain mammals in which the testes descend into scrotum only during breeding season. These mammals breed seasonally. Bat and otter are the examples of these mammals.

So, the correct answer is 'Bat'

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

In which of the following mammals, testes remain in the abdomen?

  1. Human

  2. Elephant

  3. Rabbit

  4. Ox
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In human males, the testes are situated outside the abodominal cavity within a pouch called scrotum. These type of testes is called extra-abodominal. Scrotum helps in maintaining the low temperature of the testes than the normal body temperature. It is necessary for sperm formation. But there are certain mammals in which the testes remain permanently in the abdomen and does not cause any defect. Scrotum in absent in these mammals. Examples are elephant, aquatic mammals like whales, dolphins, seal and prototherians or egg-laying mammals like Ornithorhynchus.

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

A protective layer around testes is

  1. Tunica adventitia

  2. Tunica vasculosa

  3. Tunica media

  4. Tunica albuginea
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Testes is the primary sex organ in human males. The testes are situated outside the abdominal cavity within a pouch called scortum. In adults, each testis is oval in shape, with a length of about 4 to 5 cm and width of about 2 to 3 cm. The testis is covered by a dense covering. They are enclosed in an outer tough capsule of collagenous connective tissue, the tunica albuginea. It is a protective layer.

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

Sperms develop in.

  1. Vas deferens

  2. Seminiferous tubules

  3. Prostate gland

  4. Interstitial cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Spermatogenesis is the process by which the formation of sperm which is the male gamete takes place and it is carried out in the tiny tubes like structure in seminiferous tubules of testes.

So the correct option is 'Seminiferous tubules'.

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

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

  1. Narrow pelvis in males

  2. Special protection for testes

  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

Testes are extra-abdominal in position. The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes ($2 – 2.5^o$ C lower than the normal internal body temperature), which is necessary for spermatogenesis. The slightly cooler temperature of the scrotum is necessary for the development of normal sperm. So, the testes start their development in the abdominal cavity. But during the 7th month of the foetal life, they descend into the scrotal sacs in presence of testosterone hormone.

So, only statement D is the most appropriate reason.

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

Scrotum is absent in male

  1. Bat

  2. Otter

  3. Monkey

  4. Seal
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
In human males, the testes are situated outside the abdominal cavity within a pouch called scrotum. These type of testes is called extra-abdominal. Scrotum helps in maintaining the low temperature of the testes than the normal body temperature. It is necessary for sperm formation. But there are certain mammals in which the testes remain permanently in the abdomen and does not cause any defect. Scrotum in absent in these mammals. Examples are an elephant, aquatic mammals like whales, dolphins, seal, and prototherians or egg-laying mammals like Ornithorhynchus. The scrotum is present in a male bat. But the testes descend into scrotum only during breeding season.
Thus, the correct answer is 'Seal'.
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The testes are located within the

  1. Penis

  2. Scrotum

  3. Ureter

  4. Urinary bladder
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The scrotum is a sack of skin that hangs from the body at the front of the pelvis, between the legs. It sits next to the upper thighs, just below the penis. The scrotum contains the testicles, and its function is to maintain the temperature of testicles lower than the body temperature, so as to facilitate spermatogenesis.
So, the correct option is 'Scrotum'
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Where is epididymis situated?

  1. External surface of the testis

  2. Above the testis

  3. Below the testis

  4. Internal surface of the testis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The epididymis is a narrow tube that is tightly coiled and connects the posterior end of the testis to the deferent duct. It basically transports sperms between from the testis to the deferent duct.

So, the correct answer is 'External surface of the testis'.
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'.