Naman entered into a quarrel with some farmers who were spraying DOT in their field. Many people gathered at the spot to see and enjoy the incident. The angry mob demanded that Naman should not interfere in the farmer's job. Naman tried to explain his point and finally succeeded in explaining the harmful effects of DOT.
(i) What is biomagnification? Explain with an example.
(ii) Is biomagnification related with DDT only? Comment.
(iii) What is the effect of DDT on birds?
(iv) What values did Naman promote?

Waste disposal and waste management poses a major problem in present times. Generation of garbage and its disposal is a major threat and consequently leads to severe environmental issues. The problem is not with biodegradable and recycled wastes. We realise that'the need is to reduce non-biodegradable wastes.
(i) Why is there a great concern of managing non-biodegradable waste in comparison to biodegradable waste? Explain.
(ii) As a member of eco-club of your school, suggest any two ways that you will discuss with your fellow members to organise for a 'Zero garbage day' once in a month in the school.

Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organised an awareness programme entitled 'Bury not burn'. They invited you, being a biology student to participate.
(i) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
(ii) With the help of flowcharts, one for each practice, depict the chain of events that follow.

While explaining environmental issues, teacher makes a remark that 'Global warming is the most serious threat to civilisation now'. Kalpana gets curious about the various aspects of global warming and asks some questions to her teacher.
(i) What is global warming?
(ii) What are various causes of global warming?
(iii) How can global warming be reduced? (iv) What values are shown by Kalpana?

While going to Nainital during summer vacations, Amitabh saw a board indicating the direction to Jim Corbett National Park. He asked his uncle, who happened to be a forest Officer, about national parks. He explained that national parks are maintained by government solely for the welfare of entire wild life in it
read the above passage and answer the following questions:
(i) How is wild life maintained in a national park?
(ii) name two other national parks.
(iii) What value is displayed by Amitabh's uncle?