The organisms that are tolerant to wide range of salinity, are called:

The correct answer is Option (1) → Euryhaline

Option (1) Euryhaline — Correct. Organisms that can tolerate a wide range of salinity are called euryhaline; those limited to a narrow range are stenohaline.

Note: 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 – “… The salt concentration (measured as salinity in parts per thousand), is less than 5 in inland waters, 30-35 in the sea and > 100 in some hypersaline lagoons. Some organisms are tolerant of a wide range of salinities (euryhaline) but others are restricted to a narrow range (stenohaline).”