NEET BIOLOGY

Detailed explanation-1: -Most aquatic organisms do not have to deal with extremes of temperature or moisture. Instead, their main limiting factors are the availability of sunlight and the concentration of dissolved oxygen and nutrients in the water.

Detailed explanation-2: -Salinity of seawater is affected by evaporation, precipitation, ice formation, and ice melting. Evaporation increases the salinity of seawater because when seawater evaporates, the salts are left behind, thus increasing their concentration.

Detailed explanation-3: -Why Salinity Is Important. Salinity can affect the density of ocean water: Water that has higher salinity is denser and heavier and will sink underneath less saline, warmer water. This can affect the movement of ocean currents. It can also affect marine life, which may need to regulate its intake of saltwater.

Detailed explanation-4: -The individual effect of salinity decreased organism performance in most of the observations (43%, e.g. decreased survival and growth, increased osmolyte concentration in body fluids, changed metabolic rates, etc.)