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Science · 2024 · 4 marks
CBSE 2024 · Region 2 · Set 1 · Q38
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)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.What is the meaning of 'development' in regeneration ?Differentiate between regeneration and fragmentation.
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)
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.
What is the meaning of 'development' in regeneration ?
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.| 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. |
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.