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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.
166
Blastopore is the pore of
[1]
Coelom
[2]
Archenteron
[3]
Blastocoel
[4]
Alimentary canal
167
Which set is similar?
[1]
Sebum- sweat
[2]
Vitamin B 7- Niacin
[3]
Bundle of His- Pace maker
[4]
Corpus luteum- Graffian follicles
Answer: Corpus luteum- Graffian follicles
168
After few days of delivery, the mammary glands secrete a highly nutritive fluid called
[1]
Colostrum
[2]
Renin
[3]
Serotonin
[4]
Secreti
169
Where does fertilization usually take place?
[1]
Cervix
[2]
Vagina
[3]
Uterus
[4]
Oviduct
170
Antrum is cavity of
[1]
Ovary
[2]
follicle Graafian
[3]
Blastula
[4]
Gastrual
Answer: follicle Graafian
171
In the human female, menstruation can be deferred by the administration of:
[1]
Combination of estrogen and progesterone
[2]
Combination of FSH and LH
[3]
LH only
[4]
FSH only
Answer: Combination of estrogen and progesterone
172
The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for
[1]
Providing a secondary sexual feature for exhibiting the male sex
[2]
Maintaining the scrotal temperature lower than the internal body temperature
[3]
Escaping any possible compression by the visceral organs
[4]
Providing more space for the growth of epididymis
Answer: Maintaining the scrotal temperature lower than the internal body temperature
173
Which one of the followings secretes the gonadotropic hormones?
[1]
Adrenal
[2]
Anterior pituitary
[3]
Posterior pituitary
[4]
Thyroid
Answer: Anterior pituitary
174
Which one of the following statements is false in respect of viability of mammalian sperm?
[1]
Viability of sperm is determined by its motility
[2]
Sperms must be concentrated in a thick suspension
[3]
Sperm is viable for only up to 24 hours
[4]
Survival of sperm depends on the pH of the medium and is more active in alkaline medium
Answer: Sperm is viable for only up to 24 hours
175
Foetal ejection reflex in human female is induced by
[1]
Differentiation of mammary glands
[2]
Pressure exerted by amniotic fluid
[3]
Release of oxytocin from pituitary
[4]
Fully developed foetus and placenta
Answer: Fully developed foetus and placenta
176
Fertilizin is a chemical substance produced from
[1]
Acrosome
[2]
Mature eggs
[3]
Polar bodies
[4]
Middle piece of sperm
177
Cavity of graafian follicle is
[1]
Amniotic cavity
[2]
Antrum
[3]
Liquor folliculi
[4]
Discus proligerous
178
Cauda epididymis leads to
[1]
Rete testis
[2]
Vas deferens
[3]
Ejaculatory duct
[4]
Vas efferens
179
Acrosomal cap is formed from
[1]
Ribosomes
[2]
Mitochondria
[3]
Nucleus
[4]
Golgi complex
180
Which one of the followings causes the mammary glands to enlarge at puberty?
[1]
Testosterone
[2]
Progesterone
[3]
Estrogen
[4]
Oxytocin
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