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Science · 2024 · 5 marks
CBSE 2024 · Region 3 · Set 2 · Q35
(a) What is puberty? Write any two changes that occur in boys during early teenage years. (b) List two functions performed by testis in human males.…
(a)
What is puberty ? Write any two changes that occur in boys during early teenage years.
(b)
List two functions performed by testis in human males. Mention one role each of (i) Vas deferens, (ii) Seminal Vesicle
(iii)
Urethra and (iv) Scrotum in human male reproductive system.
OR
(a)
Write two functions each of the following parts in human female reproductive system :
(i)
Ovary
(ii)
Oviduct
(iii)
Uterus
(b)
Describe the structure and function of placenta.
Marking-scheme solution
When the rate of general body growth begins to slow down and reproductive tissue begins to mature.
In boys - New thick hair growth on face, voice begins to crack, penis begins to enlarge and become erect.
(b) Testis - Formation of sperms, Secretion of hormone testosterone
Role of :
(i) Vas deferens - Delivery of sperms from testes to urethra.
(ii) Seminal vesicle - Provides nutrition to sperms /makes the transport(movement) of sperms easier.
(iii) Urethra - Common passage for sperms and urine.
(iv) Scrotum - Providing required temperature for sperm formation
(a) (i) Ovary -
Production of Estrogen hormone
Production of female gamete /egg
(ii) Oviduct -
Transfer of female gamete from the ovary to uterus
Site of fertilisation
(iii) Uterus -
Implantation of zygote
Nourishment of the developing embryo
(b) Structure of Placenta -
Disc like structure embedded in the uterine wall connected to the embryo.
It has villi on the embryo's side and blood spaces on the mother's side.
Function :
Provides a large surface area for nutrients (glucose and oxygen) to pass from the mother's side to embryo, waste substances from embryo's side to mother's blood.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.