The correct Answer is A-3, B-1, C-2, D-4
Explanation
This question pertains to the fundamental characteristics of two common unicellular organisms, Amoeba and Paramoecium, focusing on their feeding mechanisms and body shapes. These features are essential for understanding their biological classification and adaptations.
Statement-wise Analysis
- A. Amoeba feeding mechanism:
- Correct. Amoeba feeds by engulfing food particles using temporary finger-like extensions of its cytoplasm called pseudopodia. This process is known as phagocytosis. Therefore, A matches with 3.
- B. Paramoecium feeding mechanism:
- Correct. Paramoecium is a ciliated protozoan. It uses cilia, which are hair-like structures covering its body, to create water currents that sweep food particles into its oral groove, leading to a specific food vacuole. Therefore, B matches with 1.
- C. Amoeba body shape:
- Correct. Amoeba lacks a fixed body shape. Its shape is constantly changing due to the formation and retraction of pseudopodia. Thus, its body shape is variable and irregular. Therefore, C matches with 2.
- D. Paramoecium body shape:
- Correct. Paramoecium has a characteristic slipper-like or sole-like shape, which is maintained by a firm outer covering called the pellicle. This gives it a definite and fixed body shape. Therefore, D matches with 4.
Based on the above analysis, the correct matching is A-3, B-1, C-2, D-4.
Key Takeaway
Amoeba exhibits an irregular body shape and feeds via pseudopodia, while Paramoecium possesses a definite body shape and utilizes cilia for feeding.