If they cook food using wood or upla, what difficulties do they face due to smoke?
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Which of the following are chemical changes? (i) Decaying of wood (ii) Burning of wood
(a) (i) and (ii)
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Smoke and fog both are aerosols. In what way are they different?
Both fog and smoke have gas as the dispersion medium. The only difference is that the dispersed phase in fog is liquid and in smoke it is a solid
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What are the difficulties people face in a non-democratic country?
People face various difficulties in a non-democratic country as we have seen in case of Chile, Myanmar, Ghana, Pakistan, Poland, Nepal etc. In non-democratic countries, the people have no security of...
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Why is charcoal considered a better fuel than wood? What are the disadvantages of converting wood into charcoal?
Charcoal is considered a better fuel than wood because: (i) It has high calorific value. (ii) It does not produce any smoke. Disadvantages: (i) 1 kg of wood on destructive distillation produces only 0.25...
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Though wood is a renewable source of energy, but the use of wood as a fuel is not a wise decision. Explain.
Wood is a renewable source of energy. It is obtained by cutting trees. A new plant sapling usually takes more than 15 years to grow and mature into a tree....
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What are the difficulties people face in a non-democratic country
People face various difficulties in a non-democratic country as we have seen in case of Chile, Myanmar, Ghana, Pakistan, Poland, Nepal etc. In non-democratic countries, the people have no security of...
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How is charcoal obtained from wood? Why is charcoal considered a better fuel than wood?
Charcoal is obtained from wood by destructive distillation of wood. Charcoal is considered a better fuel than wood because (i) it has higher calorific value than wood. (ii) it does not produce...
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When they were young what was then used to cook food at home?
When they were young, coal, wood, upla were used to cook food at home.
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What kind of difficulties do they face in doing this work?
They have to face many difficulties while doing this work, such as: (i) They have to face excessively foul smelling garbage due to which they might suffer from many health related...
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A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is : Food crop – Rat – Snake – Hawk.
(d) Biomagnification is the phenomenon of increasing concentration of compound in the tissue of organism, as the compound passes up a food chain, usually as a result of food intake....
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