Question

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

• A. P-3, Q-4, R-1, S-2
• B. P-2, Q-3, R-4, S-1
• C. P-3, Q-1, R-2, S-4
• D. P-4, Q-3, R-1, S-2

Hint:

Halophiles → high salt.
Piezophiles → high pressure.
Mesophiles → moderate temperature (20–45°C).
Xerophiles → dry/low water environments.

Answer 1

The Correct Option is A

Step 1: Halophiles (P) are salt-loving microbes that thrive in high-salt concentrations. Hence, P corresponds to (3).
Step 2: Piezophiles (Q), also called barophiles, grow optimally under high hydrostatic pressure (deep sea organisms). Hence, Q corresponds to (4).
Step 3: Mesophiles (R) are organisms that grow best at moderate temperatures, typically between 20°C and 45°C. Hence, R corresponds to (1).
Step 4: Xerophiles (S) are adapted to environments with very low water activity (dry conditions). Hence, S corresponds to (2).
Thus, the correct mapping is: P-3, Q-4, R-1, S-2.