Column I | Column II | ||
A. | Transfer of sperms into the female genital tract | P. | Fertilisation |
B. | Embryonic development | Q. | Insemination |
C. | Attachment of blastocyst to the uterine wall | R. | Gestation |
D. | Fusion of male and female gametes | S. | Implantation |
A | B | C | D | |
1. | P | Q | R | S |
2. | R | Q | S | p |
3. | Q | R | S | P |
4. | S | P | R | Q |
Assertion (A): | Testes in males and ovaries in females are the primary sex organs. |
Reason (R): | The primary sex organs are those that are located within the pelvic cavity and the secondary sex organs are the external genitalia. |
1. | Both (A) and (R) are True and (R) correctly explains (A). |
2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
The testes are situated outside the abdominal cavity within a pouch called the scrotum. This is necessary as:
1. | The scrotum can contain lengthy ducts for the transfer of sperms |
2. | Scrotum helps in maintaining the low temperature of the testes necessary for spermatogenesis |
3. | Scrotum reduces the pressure around the testes necessary for spermatogenesis |
4. | Scrotum can store huge amounts of sperms |
1. | Length | about 4 to 5 cm |
2. | Width | about 2 to 3 cm |
3. | Lobes | three in right and two in left |
4. | Temperature | 2–2.5°C lower than the normal internal body temperature |
The number of testicular lobules in the testis is about:
1. | 50 | 2. | 150 |
3. | 200 | 4. | 250 |
Sperms are produced in:
1. | Rete testes | 2. | Epididymis |
3. | Seminiferous tubules | 4. | Vas deferens |
I: | male germ cells which undergo meiotic divisions finally leading to sperm formation |
II: | Sertoli cells that secrete the androgens |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
Leydig cells:
1. | Are present in seminiferous tubules and secrete androgens |
2. | Are present in seminiferous tubules and help in the maturation of sperms |
3. | Are present in interstitial space and secrete androgens |
4. | Are present in interstitial space and help in the maturation of sperms |
The correct sequence of male sex accessory ducts beginning from testis would be:
1. | rete testis → vasa efferentia → epididymis → vas deferens |
2. | rete testis → vas deferens → vasa efferentia → epididymis |
3. | vas deferens → vasa efferentia → epididymis → rete testis |
4. | vasa efferentia → vasa deferens → epididymis → rete testis |
The ducts of the seminal vesicles open into:
1. | Ejaculatory duct | 2. | Rete testis |
3. | Urethra | 4. | Vas deferens |