Advertisements
Advertisements
प्रश्न
Give Reasons
At the time of birth, the testes descend into the scrotal sacs.
उत्तर
In human beings (mammals) the temperature required for the production and survival of sperms is lower than that of the body temperature. Hence, to provide a suitable temperature of about 2 – 3°C lower than that of body temperature, the testes descend into the scrotal sec at the time of birth.
APPEARS IN
संबंधित प्रश्न
Describe, in brief, the changes the uterus undergoes
(i) to receive the zygote.
(ii) if zygote is not formed
List two functions ovary of human female reproductive system.
What are sexually transmitted diseases?
Differentiate between Sperm duct and fallopian rube (function)
Name the organs which produce ova (or egg cells) in human females.
Which among the following are not the functions of testes at puberty?
(i) formation of germ cells
(ii) secretion of testosterone
(iii) development of the placenta
(iv) secretion of estrogen
Write two examples of sexually transmitted diseases caused by virus.
Fill in the blank.
In humans, ------ chromosome is responsible for maleness.
Diagram shows the reproductive system of female human beings:
(i) Name the parts numbered 1 to 14.
(ii) Normally, after how many days does an ovary release an egg?
(iii) Where are the sperms released during coitus?
(iv) What is the role of sperms after their ejaculation in vagina?
(v) What is the function of the organ numbered 5?
(vi) What is the gestation period in human?
What is the composition of semen?
