Question

Match the befitting definitions with the phenomenon given.

List I	List II
A. Eurythermal	1. Able to line within a 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 an organism's life cycle.
	5. Tolerating a wide range of temperatures.

A. A-5, B-1, C-3, D-4
B. A-5, B-1, C-2, D-4
C. A-3, B-5, C-4, D-1
D. A-1, B-2, C-3, D-4

Answer 1

Hint: Eurythermal and stenothermal organisms differ in the ability to survive in a different and limited range of temperature, respectively. Conformers are those organisms that are dependent upon the changes in an external environment. Dormancy is a period when organisms are metabolically inactive to conserve their energy.

Complete answer:
Option (A) is correct. Eurythermals are organisms that can survive and tolerate wide ranges of temperature while stenothermals are organisms that can within a narrow range of temperatures.
Conformers are species with stable environments where the internal environment can vary with external. Dormancy is the period during which there is a temporary suspension of growth and development in an organism’s life cycle. Hence, the correct matching pair is A-5, B-1, C-3, and D-4.
Option (B) is incorrect because conformers are not species that are similar to one another but they are organisms of stable environments where the internal environment can vary with external.
Option (C) is incorrect. The correct matching pair is A-5, B-1, C-3, D-4 but not A-3, B-5, C-4, D-1.
Option (D) is incorrect. Eurythermals are organisms tolerating a wide range of temperature but not a narrow range of temperature while stenothermals are organisms tolerating a narrow range of temperature but not species that are similar to one another. Conformers and dormancy match correctly with their definitions. Hence, the correct matching pair is A-5, B-1, C-3, and D-4 but not A-1, B-2, C-3, and D-4.

Hence, the correct answer is option (A).

Note: Eurythermal word is a combination of ‘eury’: a Greek word which means “wide or broad” and ‘thermal’ which means “temperature”. Stenothermal word is a combination of ‘stenos’: Greek word which means narrow and ‘thermal’ which means “temperature”. Conformers are also known as ectotherms as they cannot regulate their internal temperature. Dormancy is a state of resting situation of an organism.