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Science · 2023 · 5 marks
CBSE 2023 · Region 5 · Set 1 · Q35
(a) (i) Where are testes located in the human males and why? State two function of the testes. (ii) In the human female, one of the ovaries releases…
(i)
Where are testes located in the human males and why ? State two function of the testes.
(ii)
In the human female, one of the ovaries releases an egg every month. State the changes that take place if
(1)
the egg is fertilized, and
(2)
the egg is not fertilized.
(iii)
What is done during the surgical method in males and females to prevent pregnancy ?
(i)
What happens when :
(1)
Leaves of Bryophyllum fall on the soil ?
(2)
Planaria is cut into many pieces ?
(3)
Sporangia of Rhizopus on maturation liberate spores ? Mention the modes of reproduction in each of the above three cases.
(ii)
Write the changes that occur in a flower once the fertilisation has taken place.
Marking-scheme solution
(a) (i) Outside the abdominal cavity in scrotum, sperm formation requires a lower temperature than the normal body temperature. Function:
-Formation of sperms / male gamete
-Production of testosterone / male sex hormone
(ii) ($\displaystyle 1$) The fertilized egg (zygote) starts dividing to form embryo and gets implanted in the lining of uterus.
(2) The inner lining of uterus slowly breaks and comes out through the vagina as blood and mucous.
(iii) Vas deferens is blocked / Vasectomy in males. Fallopian tube is blocked / Tubectomy in females.
(b) (i) ($\displaystyle 1$) Buds present on the leaf margins in notches begin to grow to give rise to a new plant - Vegetative propagation
(2) Each part of Planaria grows into complete organism Regeneration.
(3) The spores begin to grow after reaching a suitable moist surface - Spore formation.
Zygote divides several times to form an embryo within the ovule.
Ovule develops a tough coat and is converted into seed.
Ovary grows rapidly and ripens to form a fruit.
Petals, sepals, stamens, style and stigma may shrivel and fall off.
All How do Organisms Reproduce? questions2023 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 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.