Question:
Which type of locomotory structure is temporary and formed by cytoplasmic projection?
Which type of locomotory structure is temporary and formed by cytoplasmic projection?
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Amoeboid movement is powered by the assembly and disassembly of actin filaments beneath the cell membrane.
This pushes the cytoplasm forward to form the pseudopodium.
This pushes the cytoplasm forward to form the pseudopodium.
Updated On: Jul 22, 2026
- Flagellum
- Cilium
- Pseudopodium
- Pellicle
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the temporary locomotory structure formed by the projection of cytoplasm in certain eukaryotic single-celled organisms.
Step 2: Key Concepts and Approach:
We evaluate different protozoan locomotory structures:
- Flagella and cilia (permanent, complex axoneme-based organelles).
- Pseudopodia (temporary projections of the cell membrane and cytoplasm).
Step 3: Detailed Explanation:
• Pseudopodium (plural: Pseudopodia): Meaning "false foot," pseudopodia are temporary cytoplasmic extensions.
They are formed by the gel-sol transitions of the cytoplasm (ectoplasm and endoplasm) in amoeboid protozoans like Amoeba.
These structures are used for both locomotion and capturing food (phagocytosis). Once movement or feeding is complete, they retract. Thus, this is the correct choice.
• Flagellum and Cilium: These are permanent, highly organized organelles built from microtubules in a classic 9+2 arrangement (axoneme).
• Pellicle: This is a thin, protective proteinaceous layer covering the cell membrane in some protists (like Euglena, Paramecium), providing structure rather than acting as a locomotory projection.
Step 4: Final Answer:
The temporary locomotory structure formed by cytoplasmic projection is the pseudopodium.
The question asks to identify the temporary locomotory structure formed by the projection of cytoplasm in certain eukaryotic single-celled organisms.
Step 2: Key Concepts and Approach:
We evaluate different protozoan locomotory structures:
- Flagella and cilia (permanent, complex axoneme-based organelles).
- Pseudopodia (temporary projections of the cell membrane and cytoplasm).
Step 3: Detailed Explanation:
• Pseudopodium (plural: Pseudopodia): Meaning "false foot," pseudopodia are temporary cytoplasmic extensions.
They are formed by the gel-sol transitions of the cytoplasm (ectoplasm and endoplasm) in amoeboid protozoans like Amoeba.
These structures are used for both locomotion and capturing food (phagocytosis). Once movement or feeding is complete, they retract. Thus, this is the correct choice.
• Flagellum and Cilium: These are permanent, highly organized organelles built from microtubules in a classic 9+2 arrangement (axoneme).
• Pellicle: This is a thin, protective proteinaceous layer covering the cell membrane in some protists (like Euglena, Paramecium), providing structure rather than acting as a locomotory projection.
Step 4: Final Answer:
The temporary locomotory structure formed by cytoplasmic projection is the pseudopodium.
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