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Science · 2026 · 5 marks
CBSE 2026 · Region 1 · Set 1 · Q16
(a) Given below are certain situations. Analyse each and describe its possible impact: (i) A population of bacteria living in temperate waters whose…
Given below are certain situations. Analyse each and describe its possible impact :
(i)
A population of bacteria living in temperate waters whose temperature increased by global warming.
(ii)
The sperm encounters the egg when it reaches the oviduct in human females.
(iii)
Self pollination does not occur in a flower that contains only pistil.
(iv)
Egg does not get fertilised in a human female.
(v)
When the seed is placed under appropriate condition of water and air in the soil ?
Given below are certain situations. Analyse and describe what would happen when :
(i)
Spores are liberated from blob-like structures of the bread mould?
(ii)
Leaves of bryophyllum fall on wet soil ?
(iii)
A pollen from different species land on the stigma of totally unrelated species ?
(iv)
Copper-T is placed in the uterus of a human female ?
(v)
Spirogyra breaks into smaller fragments upon maturation ?
Marking-scheme solution
(i) Most of these bacteria would die, but the few variants resistant to heat would survive and grow further.
(ii) Fertilization occurs to form a zygote.
(iii) Cross pollination may occur leading to fruit formation. / No fertilization. / No fruit formation.
(iv) If the egg is not fertilised, the thick and spongy lining of the uterus breaks and comes out through vagina as blood and mucus, known as menstruation. / Menstruation will take place.
(v) The seed will develop into a seedling. / Germination will take place. OR
(i) When spores land on a substance and get adequate moisture and temperature, it will develop into new Rhizopus.
(ii) New plants grow from the buds located in the notches of the leaf.
(iii) The pollen tube will not be formed. / No fertilisation will take place.
(iv) Fertilization/Pregnancy will be prevented.
(v) Each fragment or piece grows into a new individual organism.
All How do Organisms Reproduce? questions2026 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 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.