DDT and Biomagnification Concepts

Biomagnification, also known as biological magnification or bioamplification, is the process where the concentration of a substance, such as DDT, increases as it moves up the food chain. This phenomenon is illustrated by the accumulation of DDT in organisms at different trophic levels, starting from algae to small fish, larger fish, birds, and eventually humans. The video explains how even small amounts of a toxic substance can become significantly concentrated, posing risks to higher-level organisms, including humans.

What is biomagnification also known as?

• Trophic degradation

• Ecological balance

• Chemical reduction

• Biological magnification

Which substance is used as an example to explain biomagnification?

• DDT

• Lead

• PCB

• Mercury

How does DDT initially enter the ecosystem?

• Through industrial waste

• By being sprayed on crops

• Via volcanic eruptions

• Through natural mineral deposits

What is the concentration of DDT in algae found in ponds?

• 2 ppm

• 0.5 ppm

• 0.04 ppm

• 0.0001 ppm

As small fish consume algae, what happens to the concentration of DDT in their bodies?

• It remains the same

• It decreases

• It increases

• It fluctuates

What is the concentration of DDT in larger fish that eat smaller fish?

• 50 ppm

• 0.5 ppm

• 2 ppm

• 25 ppm

How does the concentration of DDT change as it moves up the food chain?

• It disappears

• It decreases

• It increases

• It remains constant

What is the concentration of DDT in birds that consume large fish?

• 0.5 ppm

• 50 ppm

• 2 ppm

• 25 ppm

What is the potential concentration of DDT in humans consuming contaminated fish?

• 0.5 ppm

• 25 ppm

• 50 ppm

• 2 ppm

What does biomagnification result in as it progresses through trophic levels?

• Decreased toxicity

• Increased accumulation of toxic substances

• Stable ecosystem

• Reduced biodiversity