Question

Match column I with column II and select the correct option.

Column I	Column II
P. Freshwater lake	i. 30 - 35 ppt
Q. Sea	ii. >100 ppt
R. Hypersaline lagoon	iii. 5 ppt

• A. P - i, Q - ii, R - iii
• B. P - iii, Q - i, R - ii
• C. P - i, Q - iii, R - ii
• D. P - ii, Q - iii, R - i

Answer 1

The correct option is B P - iii, Q - i, R - ii

An ecosystem includes biological communities along with the physical environment with which they interact. For example, living (fishes, frogs) and nonliving things (water, soil, temperature) in a lake ecosystem.

Water is an important abiotic factor (non-living) of an aquatic ecosystem. For aquatic organisms the quality of water is very important along with the chemical composition, pH and the salt concentration.

The salt concentration determines whether the organisms can thrive in that water or not. The productivity and distribution of aquatic plants is also heavily dependent on water quality.

Salinity is the amount of salt dissolved in a water body. It is measured in parts per thousand (ppt), that means the number of grams of salts per kilogram of water.

• The salt concentration is less than 5 ppt in inland water. These are freshwater bodies.
• The salt concentration in the sea is 30 - 35 ppt.
• The salt concentration is > 100 ppt in hypersaline lagoons.

Hence option b is correct.

Figure : Freshwater lake, Sea and Hypersaline lagoon