Question:
What is biogas?
Answer:
Organic waste such as dead plant and animal material, animal dung and kitchen waste can be converted into a gaseous fuel called biogas. Biogas is essentially a mixture of methane and carbon dioxide. The organic waste is decomposed by bacteria in biogas digesters to emit biogas. Biogas is an excellent fuel for cooking and lighting. Biogas plants produce huge amounts of valuable organic manure each year.
Resources
Q 1.
What are population pyramids? How do they help in understanding about the population of a country?
Q 2.
What are the four Characteristics of resources?
Q 3.
Give a brief note on mining.
Q 4.
Rows of trees planted in the coastal areas to check the wind movement is called intercropping ?
Q 5.
Write a brief note on terrace farming and intercropping.
Q 6.
Name the fibre crops and name the climatic conditions required for their growth.
Q 7.
Mention some methods that are used to conserve soil
Q 8.
The world population has grown very rapidly. Why?
Q 9.
Mention the different types of resources.
Q 10.
What is plantation agriculture?
Q 11.
Write any two reasons for land degradation today?
Q 12.
Name any two steps that government has taken to conserve plants and animals.
Q 13.
What are the different kinds of cultivation?
Q 14.
Why are human resources important?
Q 15.
Differentiate between Ubiquitous and localised resources?
Q 16.
Write a brief note on wind power ?
Q 17.
What are abiotic resources?
Q 18.
What are the activities under the secondary sector?
Q 19.
What is wind power?
Q 20.
Write a brief note on the Ministry of Human Resource Development in India.
Q 21.
What is the average density of population in India?
Q 22.
What is sustainable development?
Q 23.
Different crops are grown in different regions.
Q 24.
Discuss the role of any two factors influencing population change.
Q 25.
What are the similarities between information technology industries in Bangalore and California?
Q 26.
Which sources of energy would you suggest for (a) rural areas (b) coastal areas (c) Arid Regions?
Q 27.
Distinguish between Metallic and non metallic minerals
Q 28.
When can people make the best use of nature?
Q 29.
Name the 3 sectors of activities done by people.
Q 30.
How was the word agriculture, coined?
Q 31.
What is mixed cropping or mixed farming?
Q 33.
What are the classifications of minerals?
Q 34.
How are mineral extracted from earth?
Q 35.
Name the different rocks that minerals occur in?
Q 36.
What are the causes for the destruction of natural vegetation and wildlife?
Q 37.
Sixty per cent of the world's people stay in just 10 countries. Name the countries with the percentage of world population.
Q 38.
What is resource conservation?
Q 39.
Ganga-Brahmaputra plain of India is an overpopulated region.
Q 40.
What is meant by the term industry?
Q 41.
Why cotton textile industry rapidly expanded in Mumbai?
Q 42.
Name any three common minerals used by you every day.
Q 43.
What is meant by arable land?
Q 44.
How can one increase agricultural production?
Q 46.
What are natural resources?
Q 47.
Give a brief description of soil composition or the layers of soil ?
Q 48.
What is a water-cycle?
Q 49.
What are the different characteristics of population composition?
Q 50.
What is shifting cultivation? What are its disadvantages?
