Question

Study the following and pick up the correct statements:
[I)] \Daphnia exhibits cyclomorphosis
[II)] In a thermally stratified lake of temperate region, the upper layer in winter is epilimnion
[III)] Niche is the functional role of an organism in an ecosystem
[IV)] Bergmann’s rule states the relationship between temperature and metabolic rate of animals

• A. I, III
• B. II, IV
• C. III, II
• D. I, IV

Hint:

Cyclomorphosis occurs in aquatic organisms like \textit{Daphnia}. Remember, a niche is an organism’s role, while habitat is its address.

Answer 1

The Correct Option is A

Statement I is true.
\textit{Daphnia}, a planktonic crustacean, exhibits cyclomorphosis — a seasonal variation in body shape.
Statement II is incorrect.
In a thermally stratified lake of temperate regions, during winter, the upper layer is actually hypolimnion, not epilimnion.
Statement III is true.
A niche represents the functional role an organism plays in its environment, including interactions, habitat use, and resource consumption.
Statement IV is incorrect.
Bergmann’s rule relates body size to environmental temperature, not metabolic rate. It states that endothermic animals tend to be larger in colder climates.
Hence, the correct statements are I and III.