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Which axis of binary fission is correctly matched with its protist?
AAmoeba is fixed transverse only
BParamecium is longitudinal fission
CEuglena is simple any-plane fission
DEuglena is longitudinal fission
Answer & Solution
Correct answer: D. Euglena is longitudinal fission
1. The plane of fission is set by each protist's body shape.
2. Amoeba has no fixed shape, so it splits in any plane (simple fission).
3. Therefore claiming Amoeba is fixed-transverse makes option A wrong.
4. Paramecium splits across its body (transverse), so calling it longitudinal makes B wrong.
5. Euglena splits lengthwise (longitudinal), so labelling it any-plane makes C wrong.
6. Only the Euglena-longitudinal match in D is correct.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 3 "Life Processes in Living Organisms Part 2", p.32_
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