The tightly convoluted tubule that lies along the posterior surface of the testis is

the seminiferous tubule
the rete testis
the epididymis
the ductus deferens

Solution

The epididymis is comma-shaped mass of thread like tubules attached to the posterior border of a testis.

The acrosome of the sperm is

the nucleus, containing highly condensed chromatin.
located in the mid piece, where it supplies ATP for movement.
the flagellum that makes up the sperm tail.
a vesicle containing enzymes to help the sperm penetrate the egg.

Solution

The head of the sperm is tipped with a special body, the acrosome, which contains enzymes that help the sperm penetrate the egg.

Assume 2n =12 in a hypothetical species. In gametogenesis, the number of chromosomes in a spermatid would be __________ and in a first polar body would be __________

3, 6
3, 3
6, 3
6, 6

Solution

Haploid sex cells contain half as many chromosomes as diploid somatic cells.

‘Spermiogenesis’ refers to

Formation of spermatids
Metamorphosis of spermatids into sperms
Phase of multiplication of spermatogenesis
Growth phase of spermatogenesis

Secretions from which one of the following are rich in fructose, calcium and some enzymes?

Male accessory glands
Liver
Pancreas
Salivary glands

FSH in males

Stimulates the Leydig cells for the secretion of testosterone
Induces the appearance of secondary sexual characters
Acts on sertoli cells that help in spermiogenesis
Is also known as ICSH

The function of the prostate gland in human males is to

initiate the muscular contractions leading to emission.
initiate the muscular contractions leading to ejaculation.
swell with blood and cause the penis to become erect.
secrete alkaline fluids that neutralize the acidity of the female’s reproductive tract.

Solution

The woman’s reproductive tract is acidic to help protect against infection by microorganisms. Unfortunately, this environment is also hostile to the sperm. The prostate gland secretions are alkaline, which helps neutralize the pH of the female’s system and permits the sperm to survive longer.

Mature mammalian sperm are stored in the____ prior to their release during ejaculation.

seminiferous tubules
scrotum
vas deferens
epididymis

Solution

Located on the surface of each testis, the epididymis stores mature sperm until they are ready to be emitted just prior to ejaculation.

Which one of the following is not a biological or medical reality for human reproduction?

Negative feedback control of the hypothalamus by sex hormone.
Contraception through complete chemical blockage of sperm production.
Surgical transfer of gametes from one area of there productive tract to another.
Susceptibility of reproductive organs to cancer

Solution

Males are constantly making sperms so that any chemical block of sperm production would have to be constant.Chemical blocks of sperm would also have serious medical side effects.

Which of the following is an example of positive feedback control in the reproductive cycle of males or females ?

The increased response of the hypothalamus and anterior pituitary gland in response to estrogen.
The decreased response of the hypothalamus and anterior pituitary gland in response to estrogen.
The inhibition of luteinizing hormone by high levels of testosterone.
The stimulation of luteinizing hormone by low levels of testosterone.

Solution

During day 12 to 14, a positive feedback occurs in response to estrogen. The hypothalamus and anterior pituitary gland are stimulated to release LH and FSH.

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