“Improvements in our lifestyle have resulted in greater amounts of waste
generation.” Give two examples to support the given statement. Suggest one change
that we can incorporate in our lifestyle in order to reduce non-biodegradable waste.
b. The following organisms form a food chain.
Insect, Hawk, Grass, Snake, Frog
Which of these will have highest concentration of non-biodegradable chemicals?
Name the phenomenon.
Answers
(a) Scientific conservation of soil and water to increase biomass production is called watershed management. Advantages of watershed management are: [ any 2]
i. It enhances the life of downstream dam and reservoirs.
ii. It minimizes the risk of droughts, landslides and floods.
iii. It increases ground water level
iv. It increases crop production
v. Various developmental activities like hydroelectric power generation, supply water for irrigation and other domestic uses.
(b) The concentration of chemicals goes on increasing at different trophic levels. It is maximum at higher trophic levels since human beings occupy the top level in a food chain so there is maximum concentration of toxic substances in our body i.e. biomagnification level is maximum. And according to 10% law very less amount of energy is available to humans.