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Science · 2024 · 4 marks
CBSE 2024 · Region 2 · Set 3 · Q37
Asexual reproduction involves a single parent to produce offsprings without the formation of gametes. It occurs by the following ways: Fission,…
Asexual reproduction involves a single parent to produce offsprings without the formation of gametes. It occurs by the following ways : Fission, Budding, Fragmentation, Spore formation and Regeneration. In one of the methods like regeneration, Planaria A is cut horizontally into three pieces - L, M and N and Planaria B is cut vertically into two equal halves - O and P.
A
(a) Which of the cut pieces of the two Planaria could regenerate to form a complete organism ?
(b)
Give an example of another organism which follows the same mode of reproduction as Planaria.
(c)
What is the meaning of 'development' in regeneration ?
OR
(c)
Differentiate between regeneration and fragmentation.
Marking-scheme solution
(a) All cut pieces of the two planaria will form a complete organism.
(b) Hydra
(c) Specialised cells proliferate to make a large number of cells. This mass of cells change to make different cell types and tissues. These changes take place in an organised sequence and is called development.
| OR | |
| (c) | |
| Regeneration | Fragmentation |
| Specialised cells proliferate to form new cells which multiply and form a a new individual | Each piece/fragment grows by cell-to-cell division to form a new organism. |
All How do Organisms Reproduce? questions2024 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 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.