NEET BIOLOGY

Detailed explanation-1: -Light in the ocean decreases with depth, with minimal light penetrating between 200-1, 000 meters (656-3, 280 feet) and depths below 1, 000 meters receiving no light from the surface.

Detailed explanation-2: -As a general rule, the crust temperature rises with depth due to the heat flow from the much hotter mantle; away from tectonic plate boundaries, temperature rises in about 25–30 °C/km (72–87 °F/mi) of depth near the surface in most of the world.

Detailed explanation-3: -The temperature of ocean water also varies with depth. In the ocean, solar energy is reflected in the upper surface or rapidly absorbed with depth, meaning that the deeper into the ocean you descend, the less sunlight there is. This results in less warming of the water.

Detailed explanation-4: -The boundary usually begins around 100-400 m below the sea surface and extends several hundred meters downward. This boundary region, from where there is a rapid decrease of temperature, is called the thermocline.