Question

agricultural chemicals, such as ddt, are damaging to predator populations because
multiple choice
top predators consume many plants, which are the first organisms in a food chain to take up ddt from the environment
organisms at all lower trophic levels are killed by ddt, and the predators starve
ddt is targeting at reducing population sizes of top predators.
biological magnification results in higher concentrations of ddt in higher trophic levels.

Explanation:

Biological magnification (also known as biomagnification) is a process where the concentration of a substance (like DDT) increases as it moves up the food chain. Producers (plants) take up small amounts of DDT from the environment. Primary consumers eat many producers, so they get a higher dose of DDT. Secondary consumers eat many primary consumers, and so on. Top predators, being at the highest trophic level, end up with very high concentrations of DDT in their bodies. This high - level accumulation is what damages predator populations.

• Top predators are usually carnivores and do not consume many plants.
• DDT does not kill all organisms at lower trophic levels.
• DDT was not developed to target top predators.

Answer:

biological magnification results in higher concentrations of DDT in higher trophic levels.