Organisms which can tolerate a wide range of temperature are called:

The correct answer is Option (1) → Eurythermal

Option (1) Eurythermal — Correct. Eury- means wide: eurythermal organisms live across a wide range of temperatures. Stenothermal organisms (option 2) are limited to a narrow range, and euryhaline (option 4) refers to a wide range of salinities, not temperatures.

Note 1: A similar question was also asked in CUET (UG) 2023 on 22-06-2023 (Slot 3).

Note 2: This question is from the topic “Major Abiotic Factors” in Chapter 13, Organisms and Populations, of the pre-rationalised NCERT book. This portion is not in the present NCERT book, where the chapter is now Chapter 11, Organisms and Populations. The extract below is from the pre-rationalised edition.

NCERT Extract (Pre-rationalised edition, Chapter 13, Organisms and Populations):
Major Abiotic Factors – “… A few organisms can tolerate and thrive in a wide range of temperatures (they are called eurythermal), but, a vast majority of them are restricted to a narrow range of temperatures (such organisms are called stenothermal). The levels of thermal tolerance of different species determine to a large extent their geographical distribution.”