Most plantonic life in the ocean exists in an area that is very vulnerable to marine pollution. this area is called the a) bloom zone b) microlayer c) coral reef d) nutrient-rich zone e) ocean floor

Most plantonic life in the ocean exists in an area that is very vulnerable to marine pollution. This area is called the nutrient-rich zone.

Option D

Explanation:

Most plantonic life in the ocean exists in the nutrient rich zone of the ocean. Sunlight is essentially the ultimate resource for the photosynthesis of these planktons. The photosynthesis is largely restricted to the upper layer.

Hence they are in the surface where the light penetration is available. This surface area is so rich in nutrients and hence called as the nutrient rich zone. The surface area is always active producing gases. The marine organisms biogenic sediments are all concentrated on the surface layer.