Match the befitting definitions with the phenomenon given.

	List I		List II
A	Eurythermal	1	Able to live within narrow range of temperature
B	Stenothermal	2	Species appear similar to another
C	Conformers	3	Organisms of stable environments where internal environment can vary with external
D	Dormancy	4	Temporary suspension of growth and development in organisms life cycle
		5	Tolerating wide range of temperature

The correct option is A A- 5, B- 1, C- 3, D- 4
A eurytherm is an organism that can function at a wide range of different body temperatures. They have the capability to survive and tolerate at the different temperature.

Stenothermal animals or plants are able to exist only within a narrow range of temperature.

A conformer is any organism whose internal environment is highly influenced by the external factors. A conformer is dependent upon the changes in the external environment.

Dormancy is a period in an organism's life cycle when growth, development, and (in animals) physical activity are temporarily stopped. This minimises metabolic activity and therefore helps an organism to conserve energy.

Thus, the correct answer is option A.