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Science · 2022 · 4 marks
CBSE 2022 · Region 3 · Set 3 · Q15
The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a single individual parent…
The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a single individual parent produces offsprings without the involvement of gametes. This method is a common means of increasing the offsprings rapidly under favourable conditions. Asexual reproduction occurs mostly in unicellular organisms, some plants and certain simple multicellular animals.
(a)
State the name of the organism in which binary fission takes place in a definite orientation. Also name the disease caused by this organism.
(b)
Leaves of 'Bryophyllum' when they fall on the soil develop into new plants whereas a banana leaf will not be able to do so. Why ?
(c)
(i)
Explain the process of budding in Hydra.
OR
(ii)
What happens when
(I)
a spirogyra filament matures and attains a considerable length, and
(II)
a sporangia in Rhizopus bursts on maturation ?
Marking-scheme solution
(a) Leishmania, Kala-azar
(b) Buds produced in the notches of leaf margins of 'Bryophyllum' develop into new plants, whereas Banana leaves do not have buds in their leaves.
(c) (i) Bud develops as an outgrowth due to repeated cell division at one specific site, these buds develop into tiny individuals, and when fully mature detach from the parent body and become new independent individuals.
OR
(c) (ii)
(I) The filament breaks into smaller pieces or fragments and each fragment grows into new individuals.
(II) It releases spores which germinate and eventually develops into new Rhizopus individuals.
All How do Organisms Reproduce? questions2022 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 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.