NCERT - Human Reproduction Questions and Answers of Class 12 Biology | GkSeries

Questions
196 Sertoli cells are nourishing cells in the testis. They also secrete a hormone. Identify the same.
1 Gonadotropin
2 Inhibin
3 Testosterone
4 Relaxin

Answer: Inhibin
197 Which one of the following statement is correct about sertoli cells also called as nurse cells?
1 Found in adrenal cortex and secrete adrenaline
2 Found in ovaries and secrete progesterone
3 Found in pancreas and secrete cholecystokinin
4 Found in Seminiferous tubules and provide nutrition of germ cells

Answer: Found in Seminiferous tubules and provide nutrition of germ cells
198 The hemoglobin of a human foetus:
1 Has a higher affinity for oxygen than that of an adult
2 Has a lower affinity for oxygen than that of the adult
3 Its affinity for oxygen is the same as that of an adult
4 Has only two protein subunits instead of four

Answer: Has a higher affinity for oxygen than that of an adult
199 Corpus luteum produces
1 Estrogen
2 Testosterone
3 Progesterone
4 None of the above

Answer: Progesterone
200 Loss of reproductive capacity in women after age of 45 years is
1 Menstruation
2 Ageing
3 Menopause
4 Menarche

Answer: Menopause
201 An organ not formed from ectoderm is
1 Middle ear
2 Optic nerve
3 Inner ear
4 Skin

Answer: Middle ear
202 Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorized as:
1 Cellular immunity
2 Passive immunity
3 Active immunity
4 Innate non-specific immunity

Answer: Passive immunity
203 A cross section at the midpoint of middle piece of human sperm will show
1 Centriole, mitochondria and 9 + 2 arrangement of microtubules
2 Centriole and mitochondria
3 Mitochondria and 9 + 2 arrangement of microtubules
4 9 + 2 arrangement of microtubules only

Answer: Mitochondria and 9 + 2 arrangement of microtubules
204 What happens during fertilisation in humans after many sperms reach close to the ovum?
1 Cells of corona radiata trap all the sperms except one
2 Only two sperms nearest the ovum penetrate zona pellucida
3 Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
4 All sperms except the one nearest to the ovum lose their tails

Answer: Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
205 Which one of the following statements is incorrect about menopause?
1 Generally occurs between the ages of 45 and 55
2 Causes the cessation of the female reproductive cycle
3 Anterior pituitary no longer produces FSH and LH
4 Ovaries slowly reduce their secretion of estrogen

Answer: Anterior pituitary no longer produces FSH and LH
206 Which one of the following statements is incorrect about menstruation?
1 The beginning of the cycle of menstruation is called menarche
2 During normal menstruation about 40 ml blood is lost
3 The menstrual fluid can easily clot
4 At menopause in the female, there is especially abrupt increase in gonadotropic hormones

Answer: The menstrual fluid can easily clot
207 ZIFT is
1 Transfer of mixture of sperms and ova into the fallopian tube
2 Transfer of embryo into the uterus
3 Transfer of zygote into the fallopian tube
4 Transfer of mixture of sperms and ova into the uterus

Answer: Transfer of zygote into the fallopian tube
208 Which one of the followings is incorrectly matched regarding female reproductive organs?
1 Ovaries - eggs and sex hormones are produced
2 Oviducts - serves as the site of fertilization
3 Uterus - Serves as the birth canal
4 Cervix - Contains opening to embryo/fetus

Answer: Uterus - Serves as the birth canal
209 The part of Fallopian tube closest to the ovary is
1 Infundibulum
2 Isthmus
3 Ampulla
4 Cervix

Answer: Infundibulum
210 Connective tissue around seminiferous tubules possess endocrine cells called
1 Leydig cells
2 Sertoli cells
3 Primary germ cells
4 Both (1) and (2)

Answer: Leydig cells

Chapters

junior administrative assistant jaa test series