Question

In aquatic environments, primary food production is strictly confined to which region?

Options

• The regions with the lowest pH levels

• The deep ocean floor

• The illuminated surface layers

• The areas near hydrothermal vents

Answer 1

In aquatic environments, primary food production is strictly confined to the illuminated surface layers. This is because photosynthetic organisms require light to produce food, and light cannot penetrate to significant depths in water, limiting primary production to the euphotic zone.