Question 1
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of the male and the female gametes is called ___________.
(i) Fertilization takes place in the ___________.
(j) The zygote divides to form __________, which is implanted in uterus.
(k) The structure which provides vascular connection between the fetus and uterus is called ________.
Question 4
Write two major functions each of testis and ovary.
Functions of the Testis:
(a) They produce male gametes called spermatozoa by the process of spermatogenesis.
(b) The Leydig cells of the seminiferous tubules secrete the male sex hormone called testosterone. Testosterone aids the development of secondary sex characteristics in males.
Functions of the ovary:
(a) They produce female gametes called ova by the process of oogenesis.
(b) The growing Graffian follicles secrete the female sex hormone called estrogen. Estrogen aids the development of secondary sex characteristics in females.
Question 20
How many eggs are released by a human ovary in a month?
How many eggs do you think would have been released if the mother gave birth to identical twins?
Would your answer change if the twins born were fraternal?
Question 21
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
