Question

Study the following statements and select the correct ones. (i) Organisms capable to tolerate a wide range of temperature are called stenothermal organisms. (ii) Thermal tolerance of different species determines their geographical distribution to a large extent. (iii) Average temperature in tropical deserts in summer is $< 50^{\circ}C$. (iv) Thermal springs cannot sustain life due to very high average temperature i. e., $> 100^{\circ}C$.

• A. (i) only
• B. (ii) only
• C. {i), (ii) and (iii)
• D. {i), (iii) and (iv)

Answer 1

Answer: (B)

(ii) only

Answer 2

The geographical distribution of different species of organisms depends on their thermal tolerance. Organisms which can tolerate a wide range of temperature variations, e.g., most mammals and birds are called eurythermal organisms. The average temperature in tropical deserts in summer is more than $50^{\circ}C$. Thermal springs can sustain life, where average temperature exceed $100^{\circ}C$ i.a, many microorganisms (e.g., some archaebacteria) live there.