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Science · 2025 · 5 marks
CBSE 2025 · Region 6 · Set 1 · Q35
(a) Define Puberty. List any two changes seen in boys at the time of puberty. (b) Why are testes in human males located outside the abdominal cavity…
(a)
Define Puberty. List any two changes seen in boys at the time of puberty.
(b)
Why are testes in human males located outside the abdominal cavity in scrotum ?
(c)
List any three techniques of contraception used by humans. Which one of these is not meant for males?
OR
(a)
Name the part performing following functions in human female reproductive system :
(i)
production of eggs
(ii)
site of fertilization
(iii)
site of implantation
(iv)
entry of the sperms
(b)
What changes are observed in the uterus :
(i)
subsequent to implantation of zygote and
(ii)
if an egg does not get fertilized ?
Marking-scheme solution
(a)
When the rate of general body growth begins to slow down and reproduction tissues begin to mature - This period of adolescence is called puberty.
Changes in boys:
Cracking of voice/Thick hair growth on face / Penis occasionally begins to become enlarge and erect /Thick hair growing in the genital area or arm pits.
(b)
As sperm formation requires a temperature which is lower than normal body temperature, that is why testes are located outside the abdominal cavity in scortum.
(c)
Three techniques of contraception:
Mechanical barrier /Condom
Chemical method /Oral pills
Loop or copper T inside uterus
Surgical methods /Blockage of Vas deferens or fallopian tube
Not meant for males: Oral pills / Loop or Copper T
(a)(i)
Ovary
(ii) Oviduct / fallopian tube
(iii) Uterus
(iv) Vagina / Vaginal passage
(b)(i)
Zygote starts dividing in the uterus.
Thickened Uterine lining which is richly supplied with blood vessels nourishes the developing embryo.
Placenta develops, which provides oxygen, food to the embryo and removes waste substances.
(ii)
The uterine lining slowly breaks down and comes out as blood and mucous along with unfertilised egg.
All How do Organisms Reproduce? questions2025 question paperNCERT solutions: How do Organisms Reproduce?Practice How do Organisms Reproduce? →
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.