1Looking at a dumping site heaped with ceramics, glass, plastic, fiber and other waste, what effects are seen in the environment due to the haphazard disposal of such waste materials?
2In your opinion, what measures can be taken to control such pollution?
3Why is detergent called a soapless soap? Choices: it does not give lather with hard water as a soap; it has the same chemical composition as soap; it has cleaning properties like soap and it can be used with hard water; it has cleaning properties like soap but its chemical nature is different.
4Identify the group of insecticides. Choices: potassium chloride, aldrin, benzene hexachloride; DDT, sodium chloride, aldrin; dieldrin, DDT, methoxychloride; potassium chloride, aldrin, malathion.
5In which group does sodium stearate lie? Choices: soap; detergent; insecticide; food preservative.
6What is the main use of detergents? Choices: to clean hands and feet; to take a bath; to wash clothes; to clean the toilet.
7Which of the following compounds is used to ripen fruits? Choices: calcium carbide; calcium carbonate; sodium sulphate; sodium carbonate.
8Write the differences between chemical pesticides and biological pesticides.
9Write the differences between chemical food preservatives and organic food preservatives.
10Write the differences between soap and detergent.
11Give reason: Use of DDT powder causes imbalance in the ecosystem.
12Give reason: The use of chemical pesticides should be decreased.
13Give reason: Salt is used in the process of making soap.
14Give reason: Pickles can be preserved for a long time.
15Write the full forms of DDT and BHC.
16What do you mean by food preservatives? Why are they used?
17What chemicals are used as food preservatives?
18What are the natural methods used to preserve the nutrients of food?
19What do you mean by natural food preservatives? Why are they good in comparison to the chemical food preservatives? Analyze it.
20How can fruits be ripened artificially? Write methods and processes for it.
21What precautions should be taken while using chemical pesticides?
22Make a list of chemicals used for cleaning purposes in your house and locality. Write the effects of these substances on the environment.
23Explain the soap making process.
24What is detergent? Write its two examples. What effects are seen on human health and the environment due to the use of detergent? Present your argument.
25There has been an excessive use of chemical pesticides in Hari's village, due to which complex problems have been observed in the health of people and the environment. What may be the alternatives to solve these problems? Give some suggestions.
26What do you mean by chemical pollution? What are its effects? Write practical ways to minimize it.
27Write about the pollution caused by industrial products like cement, glass, ceramics, plastic, fiber, chemical fertilizers, soap and detergent in your locality. Write its causes and suggest proper ways of management.
28Why do some fertile eggs of birds affected by DDT still fail to hatch?
29How do chemical fertilizers and pesticides used in fields reach ponds and rivers, and what do they do there?
30Name any five insecticides banned in Nepal. Which insecticide has its production, buying, selling, export and import restricted?