alleryWhich structure is responsible for cell movement in some single-celled organisms?
ACentrioles
BCilia or flagella
CMitochondria
DRibosomes by common convention
Answer & Solution
Correct answer: B. Cilia or flagella
1. Single-celled organisms move using cilia or flagella.
2. Flagella are long whip-like projections (e.g. in Euglena).
3. Cilia are short hair-like structures (e.g. in Paramecium).
4. Both are made of microtubules.
5. So cell movement uses cilia or flagella.
_Source: Selina Concise Biology ICSE Class 10, Ch 1 'Cell, the Structural and Functional Unit of Life'_
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