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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Human Reproduction of Biology.
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
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
200
Loss of reproductive capacity in women after age of 45 years is
[1]
Menstruation
[2]
Ageing
[3]
Menopause
[4]
Menarche
201
An organ not formed from ectoderm is
[1]
Middle ear
[2]
Optic nerve
[3]
Inner ear
[4]
Skin
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
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
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)
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