Q. Consider the following: 

1. Bioaccumulation
2. Bio-concentration
3. Bio-magnification

Which among the above take place at the same trophic level of the Food Chain?
Answer: Only 1 & 2
Notes: Bioaccumulation is defined as the gradual accumulation of the substances, like pesticides or other chemicals, in an organism. It occurs when an organism absorbs a substance with faster rate than that at which the substance is lost by catabolism and excretion. Bio-concentration is the process through which a chemical concentration in an aquatic organism exceeds that in water due to the exposure to a waterborne chemical.