The incremental increase of DDT and other toxic materials at different trophic levels in an aquatic ecosystem is called;

Correct option is D

The correct answer is Biomagnification.
· Biomagnification refers to the increasing concentration of toxic substances such as DDT, mercury, or PCBs as they move up the food chain.
· Small aquatic organisms absorb toxins from water. These are consumed by fish, which are in turn consumed by birds or humans, causing the toxin levels to multiply.
· The chemicals are non-biodegradable and accumulate in fatty tissues, increasing with each trophic level.
Information Booster:
· Top-level predators (e.g., birds of prey, humans) are most affected.
· DDT caused eggshell thinning in birds, leading to population decline.
· Water pollution is the presence of contaminants in water.
· Eutrophication is caused by nutrient runoff leading to algal bloom and oxygen depletion.
· Greenhouse effect relates to global warming, not toxin buildup in food chains.