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

In mammals, the testis is posteriorly connected to the scrotal sac by an elastic cord called

  1. Spermatic cord

  2. Rachis

  3. Gubernaculum

  4. Ligament
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In mammals in the embryonic stage, the testis is posteriorly connected to the scrotal sac by an elastic cord called as gubernaculum. It helps in the descent of testis during the 7th month of pregnancy. So the correct answer is C.

The spermatic cord in males is formed by the vas deferens and surrounding tissue that runs from the deep inguinal ring down to each testicle.

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

Structure absent in Frog's testis is

  1. Seminiferous tubules

  2. Seminal vesicle

  3. Sertoli cells

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1. In frog,The mature spermatozoon is dependent upon external sources of nutrition so that it joins from 25 to 40 other spermatozoa, all of whose heads may be seen converging into the cytoplasm of a relatively large, columnar-type basal cell known as the Sertoli cell. This is functionally a nurse cell.

2. Spermatozoa are carried passively down the ureter to the slight dilation near the cloaca, known as the seminal vesicle. Within the vesicle the spermatozoa are stored briefly in clusters until amplexus and oviposition occur.

3. The spermatozoa are produced in subdivisions of the testes known as seminiferous tubules. These are closely packed, oval-shaped sacs, which are separated from each other by thin partitions (septula) of supporting (connective) tissue known as interstitial tissue.

So, the correct answer is 'None of the above'.

 

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

In most of the mammals, the testes remain enclosed in an extra-abdominal sac, the scrotum, where the temperature is lower than that in the abdomen. What will happen if the temperature of the scrotum is artificially maintained to the level of abdominal temperature?

  1. No effect; germinal epithelium will carry out normal spermatogenesis

  2. Germinal epithelium will produce a large quantity of androgen secretion

  3. Germinal epithelium will produce more sperms

  4. Germinal epithelium will degenerate, resulting in sterility
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The scrotum is a pouch, suspended from the groin, that contains the testes and some of the male sex accessory ducts. One function of the scrotum is to help maintain the temperature necessary for spermatogenesis by locating the testes outside of the body cavity. The temperature in the human scrotum is 3.1 °C (5.6 °F) lower than the normal temperature within the body (37 °C, or 98.6 °F). If the temperature is maintained to the level of abdominal temperature, The germinal epithelium will degenerate resulting in sterility.

So the correct option is 'germinal epithelium will degenerate, resulting in sterility'.

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

Which of the following structures is incorrectly paired with its function?

  1. Gonads-gamete-producing organs

  2. Spermatheca-sperm-transferrring organ found in male insects

  3. Cloaca-commori opening for reproductive, excretory, and digestive systems

  4. Endometrium-lining of the uterus, forms maternal part of placenta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gonads- A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes (sex cells) and sex hormones of an organism. In the female of the species the reproductive cells are the egg cells, and in the male, the reproductive cells are the sperm.

Spermatheca- The spermatheca is an organ of the female reproductive tract in insects. Its purpose is to receive and store sperm from the male or, in the case of hermaphrodites, the male component of the body. 
Cloaca- In animal anatomy, a cloaca is a posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals, opening at the vent. All amphibians, birds, reptiles, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and faeces.
Endometrium- The endometrium is the inner epithelial layer, along with its mucous membrane, of the mammalian uterus. It has a basal layer and a functional layer; the functional layer thickens and then is shed during menstruation in humans, as well as some other mammals.
So the correct option is 'spermatheca- sperm-transferring organ found in male insects'.