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प्रश्न
With the help of a flow chart, show the phenomenon of biomagnifications of DDT in an aquatic food chain.
उत्तर
The increased concentration of toxic materials at each trophic level of a food chain is called biomagnification or biological concentration.
When the agricultural fields are sprayed with dichlorodiphenyltrichloroethane (DDT), it is carried into water bodies with low concentration. It gets accumulated by the zooplankton and its concentration goes on increasing at each trophic level in a food chain—from small fish to large fish and birds.
संबंधित प्रश्न
State the law which governs the energy flow in an ecosystem.
Food chain begins with
What do you understand by the term hydroelectric power?
Explain the energy changes taking place in a hydroelectric dam?
Temperature, light and wind are ________ factors.
Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. While plants have been referred to as autotrophs and animals as heterotrophs, what are microbes referred to as? How do the microbes fulfil their energy requirements?
What will happen to an ecosystem if all top carnivore population is removed?
Complete the following chart regarding energy flow in an Ecosystem and re-write:
| ? | Herbivores |
| Primary Producer | ? |
| ? | Man, Lion |
| Secondary consumer | ? |
Complete the given chart:
| Trophic levels | Type of organisms | Status | Example |
| ______ | ______ | Secondary consumer | ______ |
| Second trophic level | Herbivore, Heterotrophs | _____ | ______ |
| ______ | ______ | ______ | Phytoplankton, grass, trees |
