Question 1

Cryptorchidism is the condition in man when:

Accepted Answer

In mammals the testis are located in the extra abdominal scrotal sac. But non descent of testes in scrotum is called cryptorchidism. Person becomes sterile.

Question 2

In human, the unpaired male reproductive structure is:

Accepted Answer

Correct answer is B

Question 3

There are some special types of cells found in the seminiferous tubules known as sertoli cells. These are:

Accepted Answer

Each seminiferous tubules is lined by a germinal epithelium formed of two types of cell germ or spermatogenic cells and sertoli or nurse cells. Sertoli cells are a few pyramidal shaped cells which provide nutrition to developing sperms.

Question 4

There is a connective tissue cord extending between the testis and abdominal wall called:

Accepted Answer

This passes through the inguinal canal.

Question 5

The elastic tissue connecting the cauda epididymis to the scrotal sac is:

Accepted Answer

Gubernaculum is the ligamentous connective (elastic) cord which connects testes to scrotal sac posteriorly. This cord represents the original mesorchium.

Question 6

The seminiferous tubules of the testis are lined by the germinal epithelium consisting of:

Accepted Answer

Sertoli cells are located in seminiferous tubules which nourish spermatozoa. Each testicular lobules of testis contains two to three seminiferous tubules. Wall of each seminiferous tubules is formed of a single layered germinal epithelium.

Question 7

The stroma of the ovary consists of nerves, blood vessels, muscle fibres and a type of protein called:

Accepted Answer

Correct answer is A

Question 8

Inhibition of secretion of which of the following hormone is necessary for disintegration of corpus luteum:

Accepted Answer

Progesterone is a hormone produced primarily by the corpus luteum of the ovary but also by the placenta. The action of the hormone is to cause endometrial development preparatory for the reception and nutrition of the embryo. It suppresses oullation, estrus and the secretion of LH by pituitary. During pregnancy, progesterone production by corpus luteum continues through, till near term. If pregnancy has not occurred, the output of both estrogen and progesterone suddenly fall on or about the twenty eight day of the menstrual cycle, menstrual flow starts and the uterine endometrium starts sloughing.

Question 9

Which of the following layers in an antral follicle is acelluar?

Accepted Answer

Zona pellucida is secreted by secondary oocyte around itself.

Question 10

In humans the oocyte is maintained in a state of meiotic arrest by secretions of:

Accepted Answer

Correct answer is A

Question 11

In female rabbit, the expanded proximal part of the oviduct is known as:

Accepted Answer

Correct answer is A

Question 12

The mammalian follicle was first described by:

Accepted Answer

Regner de Graaf (1641-1673) discovered follicles in human ovary is 1671 and considered them to be eggs. Since graaf discovered follicles. They are also called Graafian follicles.

Question 13

Which of the following events is not associated with ovulation in human female?

Accepted Answer

At ovulation, LH surge occur due to hypersecretion of estrogen, which gives positive feed back to anterior pituitary for secretion of LH.

Question 14

Graafian follicle are characteristically found in the:

Accepted Answer

Cortex contains many small and large spherical or oval ovarian follicles. A fully matured follicle is called graafian follicle.

Question 15

The layer of cells immediately surrounding the ovum but outside the zona pellucida is called:

Accepted Answer

Human egg or ovum is non cleidoic and alecithal. The ovum possesses three coverings-Inner plasma membrane, middle glycoprotein zona pellucida and outer cellular corona radiata with radially elongated scattered cells held in mucopolysaccharide

Question 16

Spermatogenesis is promoted by:

Accepted Answer

Correct answer is B

Question 17

Capacitation refers to changes in the:

Accepted Answer

Capacitation refers to changes in the sperm before fertilization. It increases fertilization capacity of sperms.

Question 18

The process of releasing the ripe female gamete (ovum) from the ovary is called:

Accepted Answer

Discharge of a mature ovum from Graafian follicle is known as ovulation.

Question 19

In which phase of cell division is oogonia arrested:

Accepted Answer

The parent cells that produce oocytes are called oogonia. Oogonia are diploid cells. All the oogonia start, the process of meiosis and form primary oocytes prior to birth. They are arrested in prophase I and remain this way until the female reaches puberty, until a preovulatory surge of luteinizing hormone (LH) from the pituitary stimulates meiotic resumption. The prophase I-arrested oocyte acquires the ability to resume meiosis as it approaches its full size.

Question 20

Germ cells in mammalian gonads are produced by:

Accepted Answer

Spermatogonia/oogonia are produced by mitotic cell division while spermatids and ova are produced after meiotic cell division.

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Solutions for Human Reproduction Important Questions

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