Biological magnification is the increasing concentration of toxic substances in organisms at successive trophic levels of a food chain. It is an important concept in ecology and environmental pollution.
Which of the following best describes biological magnification?
Correct Answer:
(A) The increase in a pollutant's concentration as it moves through a food web.
Biomagnification is the process where pollutants become more concentrated at higher trophic levels in a food chain or web. This means that as you move up the food chain, the concentration of toxic substances increases in organisms, potentially reaching harmful levels, especially at the top of the food web.
Ques: 2
Which of the following is a well-known example of a substance that undergoes biomagnification?
Correct Answer:
(C) DDT (dichlorodiphenyltrichloroethane).
DDT is a classic example of a persistent, fat-soluble pesticide that undergoes biomagnification, leading to its concentration in organisms at higher trophic levels, like birds and fish.
Ques: 3
What is the main factor that causes pollutants to biomagnify?
Correct Answer:
(B) The fact that pollutants accumulate in the tissues of organisms.
Biomagnification occurs because pollutants, particularly those that are fat-soluble and persistent, accumulate in the tissues of organisms as they consume other organisms.
Ques: 4
What are the potential consequences of biomagnification for top predators in an ecosystem?
Correct Answer:
(B) Reduced life expectancy and increased susceptibility to health problems.
Biomagnification can lead to the accumulation of pollutants in top predators, potentially causing a decline in their health and reproductive success, including thinning eggshells in birds and reduced immune function in other organisms.
Ques: 5
What is the impact of biomagnification on the food chain?
Correct Answer:
(B) It disrupts the food chain, concentrating toxins at higher trophic levels.
Biomagnification disrupts the food chain by concentrating pollutants at higher trophic levels, potentially harming top predators and affecting ecosystem health.