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प्रश्न
Observe figure and answer the following questions.
Biomagnification of DDT in an aquatic food chain
- What ecological term is used to describe the DDT accumulation at different trophic levels?
- List any one effect of DDT accumulation on birds
- Will DDT accumulation lead to eutrophication?
- Does it affect the BOD?
- Name disease caused by accumulation of any heavy metal.
उत्तर
- Biomagnification
- High concentrations of DDT disturb, calcium metabolism in birds, which causes thinning of eggshells and their premature breaking, eventually causing decline in bird populations.
- Yes.
- Yes, it increases the BOD.
- Disease caused by eating fish found in water contaminated with industrial waste having mercury is Minamata disease. Cd pollution associated with the disease is called “Itai-Itai”. Arsenic (As) poisoning causes "Black foot disease".
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संबंधित प्रश्न
Water samples were collected at points A, B and C in a segment of a river near a sugar factory and tested for BOD level. The BOD levels of samples A, B and C were 400 mg/L, 480 mg/L and 8 mg/L respectively. What is this indicative of? Explain why the BOD level gets reduced considerably at the collection point C?
A high Biological oxygen demand (BOD) indicates that ______.
The polluting strength of sewage is usually characterized by its ______.
World’s most problematic aquatic weed is ______.
Algal blooms impart a distinct colour to water due to ______.
What is cultural eutrophication?
What do you understand by biomagnification?
What are the three major kinds of impurities in domestic wastewater?
Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an example which could lower the dissolved oxygen content of an aquatic body.
How has DDT caused decline in bird population?
