Problem 15
What are pesticides and herbicides? Explain giving examples.
Problem 16
What do you mean by green chemistry? How will it help decrease environmental pollution?
Problem 17
What would have happened if the greenhouse gases were totally missing in the earth's atmosphere? Discuss.
Problem 18
A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.
Problem 19
How can domestic waste be used as manure?
Problem 20
For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.
