OBJECTIVE LIFE SCIENCE
ECOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Build-up of a toxin in an individual organism
|
|
|
Increase in concentration of a toxin at higher trophic levels
|
|
|
Build-up of mass in lower trophic levels
|
|
|
Decrease in concentration of a toxin at higher trophic levels
|
Detailed explanation-1: -Bioaccumulation is the gradual accumulation of substances, such as pesticides or other chemicals, in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost or eliminated by catabolism and excretion.
Detailed explanation-2: -Bioaccumulation means an increase in the concentration of a chemical in a biological organism over time, compared to the chemical’s concentration in the environment. Compounds accumulate in living things any time they are taken up and stored faster than they are broken down (metabolized) or excreted.
Detailed explanation-3: -Bioaccumulation occurs when toxins build up-or accumulate-in a food chain. The animals at the top of the food chain are affected most severely. This is what happens: Small amounts of toxic substances-often pesticides or pollution from human activity-are absorbed by plants.