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.
How was the word agriculture, coined?
Q 4.
Name the fibre crops and name the climatic conditions required for their growth.
Q 5.
The world population has grown very rapidly. Why?
Q 6.
Mention the different types of resources.
Q 7.
Give a brief note on mining.
Q 8.
Differentiate between emigrants and immigrants.
Q 9.
Discuss the role of any two factors influencing population change.
Q 10.
Ganga-Brahmaputra plain of India is an overpopulated region.
Q 11.
Rows of trees planted in the coastal areas to check the wind movement is called intercropping ?
Q 12.
Human interference and changes of climate can maintain the ecosystem ?
Q 13.
What is meant by the term industry?
Q 14.
What is mixed cropping or mixed farming?
Q 15.
Name the different rocks that minerals occur in?
Q 16.
What is resource conservation?
Q 17.
Why are human resources important?
Q 18.
Name the factors influencing agriculture?
Q 19.
Different crops are grown in different regions.
Q 20.
Name any two steps that government has taken to conserve plants and animals.
Q 21.
Give reason for Petroleum is referred to as black gold.
Q 22.
Write a brief note on wind power ?
Q 23.
What are the different kinds of cultivation?
Q 24.
What are natural resources?
Q 25.
Mention some methods that are used to conserve soil
Q 26.
Write a brief note on terrace farming and intercropping.
Q 27.
What is the average density of population in India?
Q 28.
What is sustainable development?
Q 29.
What is plantation agriculture?
Q 30.
Write any two reasons for land degradation today?
Q 31.
Distinguish between Conventional and non conventional sources of energy
Q 32.
Distinguish between Metallic and non metallic minerals
Q 33.
Name the 3 sectors of activities done by people.
Q 34.
What is meant by arable land?
Q 35.
What is the difference between Subsistence farming and Commercial farming?
Q 36.
What are the classifications of minerals?
Q 37.
How are mineral extracted from earth?
Q 38.
Write a brief note on salt.
Q 39.
What do the 3Rs stand for in context with conservation of natural resources?
Q 41.
What are the causes for the destruction of natural vegetation and wildlife?
Q 42.
Write a brief note on the Ministry of Human Resource Development in India.
Q 43.
What are the different characteristics of population composition?
Q 44.
Differentiate between Ubiquitous and localised resources?
Q 45.
Which are the main factors which influence the location of an industry?
Q 46.
Why cotton textile industry rapidly expanded in Mumbai?
Q 47.
Which sources of energy would you suggest for (a) rural areas (b) coastal areas (c) Arid Regions?
Q 48.
Give five ways in which you can save energy at home.
Q 49.
What is a resource?
Q 50.
What are abiotic resources?
