Question

Illuminated zone or producing zone of sea is

• A. Euphotic stratum
• B. Dysphotic stratum
• C. Aphotic stratum
• D. None of the above

Answer 1

The correct option is A Euphotic stratum

The stratum of the water column nearest the surface of the ocean is referred as the photic zone. The photic zone can be sub divided into two different vertical regions. The uppermost portion of the photic zone, where there is adequate light to support photosynthesis by phytoplankton and plants is referred to as the euphotic zone or euphotic stratum.

The lower portion of the photic zone, where the light intensity is insufficient for photosynthesis, is called as the dysphotic zone. The dysphotic zone is also referred to as the mesopelagic zone, or the twilight zone.