Biology Our Environment CBSE Board 2026 Medium
Consider a simple aquatic ecosystem like a lake which consists of algae, small fish and large fishes. It was…
Consider a simple aquatic ecosystem like a lake which consists of algae, small fish and large fishes. It was found that the lake water was contaminated with a low concentration of a non-biodegradable pesticide, DDT. Based on this ecosystem, answer the following questions :
- (a)In which organism will the concentration of the pesticide DDT be the highest ? Name and explain the phenomenon.
- (b)Why is the flow of energy in a food chain always unidirectional ?
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