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.
Which are the two main climatic factors responsible for soil formation?
Q 2.
What are population pyramids? How do they help in understanding about the population of a country?
Q 3.
Which industry is often referred to as the backbone of modem industry and why?
Q 4.
Distinguish between Biogas and natural gas
Q 5.
Mention the different types of resources.
Q 6.
Name any two steps that government has taken to conserve plants and animals.
Q 7.
Write a brief note on terrace farming and intercropping.
Q 8.
What is plantation agriculture?
Q 9.
What are the four Characteristics of resources?
Q 10.
How was the word agriculture, coined?
Q 11.
What is Nomadic herding?
Q 13.
Mention some methods that are used to conserve soil
Q 14.
Why is land considered an important resource?
Q 15.
What is meant by the term industry?
Q 16.
Distinguish between Metallic and non metallic minerals
Q 17.
What is mixed cropping or mixed farming?
Q 18.
What is the average density of population in India?
Q 19.
The world population has grown very rapidly. Why?
Q 20.
Discuss the role of any two factors influencing population change.
Q 21.
Rows of trees planted in the coastal areas to check the wind movement is called intercropping ?
Q 22.
How can one increase agricultural production?
Q 23.
Give a brief note on mining.
Q 24.
What are the causes for the destruction of natural vegetation and wildlife?
Q 25.
What is shifting cultivation? What are its disadvantages?
Q 26.
Write any two reasons for land degradation today?
Q 27.
Distinguish between the followings
(i) Agro-based and mineral based industry.
Q 28.
Give reason for Petroleum is referred to as black gold.
Q 29.
Quarrying can become a major environmental concern.
Q 30.
What is the difference between Subsistence farming and Commercial farming?
Q 31.
What are the classifications of minerals?
Q 32.
How are mineral extracted from earth?
Q 33.
Name the different rocks that minerals occur in?
Q 34.
Write a brief note on salt.
Q 35.
What do the 3Rs stand for in context with conservation of natural resources?
Q 37.
Name a few landforms.
Q 38.
What is a water-cycle?
Q 39.
What are the different characteristics of population composition?
Q 40.
What is sustainable development?
Q 41.
Name the factors influencing agriculture?
Q 42.
Name the fibre crops and name the climatic conditions required for their growth.
Q 43.
Which are the main factors which influence the location of an industry?
Q 44.
Name any three common minerals used by you every day.
Q 45.
What is an ore? Where are the ores of metallic minerals generally located?
Q 46.
Give Reason for Environmental aspects must be carefully looked into before building huge dams.
Q 47.
Give reason for Most industries are concentrated around coal mines.
Q 48.
Distinguish between Conventional and non conventional sources of energy
Q 49.
Distinguish between Ferrous and nonferrous minerals
Q 50.
What is a resource?
