GATE 2023 BT – Question 37
Match the type of bacteria in Group I with their respective growth properties in Group II.
| Group I | Group II |
|---|---|
| P. Halophile | 1. Grows optimally between 20 °C and 45 °C |
| Q. Piezophile | 2. Grows best at low water activity |
| R. Mesophile | 3. Grows at high level of salt |
| S. Xerophile | 4. Grows optimally at high hydrostatic pressure |
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Correct answer: (A) P-3, Q-4, R-1, S-2
Explanation
Classify each organism by the condition it prefers.
- **Halophile:** needs or tolerates a high concentration of salt (NaCl). P-3.
- **Piezophile (barophile):** grows best at high hydrostatic pressure (deep sea). Q-4.
- **Mesophile:** grows best at moderate temperatures, roughly 20 to 45 °C. R-1.
- **Xerophile:** grows best at very low water activity (dry conditions). S-2.
Match: **P-3, Q-4, R-1, S-2** (option A).