Zoology MCQs
Topic Notes: Zoology
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which organism utilizes pseudopodia as its primary mechanism for locomotion?
Answer:
amoeba
Amoebae move and feed by extending temporary cytoplasmic projections known as pseudopodia, or 'false feet'. This process involves the streaming of cytoplasm, which allows the cell to change shape and crawl across surfaces, distinguishing it from organisms that use cilia or flagella.
2
Which of the following is not considered a specialized non-muscular structure involved in cellular movement?
Answer:
spines
Pseudopodia, cilia, and flagella are well-documented organelles or cellular extensions used for locomotion in various microorganisms and cells. Spines, however, are typically rigid, static projections found on the surface of organisms (like sea urchins or plants) for protection or structural support, rather than being active organelles for cellular motility.
3
Which specific protein is the primary structural component of bacterial flagella?
Answer:
flagellin
Flagellin is a globular protein that arranges itself in a hollow cylinder to form the filament of a bacterial flagellum. It is distinct from the tubulin proteins found in eukaryotic cilia and flagella, which are organized in a 9+2 microtubule arrangement. This protein is essential for the motility of many bacterial species.