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Multiple choice evs - i rules are for everyone soil and its conservations soil pollution-control protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

The shifting cultivation method, called as jhum, belongs to the category of

  1. Industrial forestry

  2. Agro-forestry

  3. Commercial forestry

  4. Social forestry

  5. Conservation forestry
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Agroforestry or agro-sylviculture is a land use management system in which trees or shrubs are grown around or among crops or pastureland.

Shifting cultivation is an agricultural system in which plots of land are cultivated temporarily, then abandoned and allowed to revert to their natural vegetation, while the cultivator moves on to another plot. The period of cultivation is usually terminated, when the soil shows signs of exhaustion or, more commonly, when the field is overrun by weeds. 
Shifting cultivation is a form of agriculture or a cultivation system, in which, at any particular point in time, a minority of 'fields' are in cultivation and a majority are in various stages of natural re-growth. Over time, fields are cultivated for a relatively short time, and allowed to recover, or are fallowed, for a relatively long time. Eventually a previously cultivated field will be cleared of the natural vegetation and planted in crops again. This type of farming is called as jhumming in India.

Multiple choice evs - i rules are for everyone soil and its conservations soil pollution-control protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

In hilly regions, erosion can be minimised by 

  1. Terracing

  2. Ploughing effectively

  3. Manuring

  4. Strip cropping
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Terracing is the practice of creating nearly level areas in a hillside area. The terraces form a series of steps, each at a higher level than the previous. Terraces are protected from erosion of soil. 

Strip cropping or strip farming is defined as alternating crop rows between heavy-rooted plants and loosely-rooted plants to minimize erosion. An example of strip cropping is planting a field with strips of soybean and alfalfa.

Multiple choice evs - i rules are for everyone soil and its conservations soil pollution-control protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

Soil fertility can be increased with out addition of fertilisers by 

  1. Strip cropping

  2. Crop rotation

  3. Terracing

  4. Roots
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Crop rotation is the practice of growing a series of different types of crops in the same area in sequential seasons. Crop rotation gives various nutrients to the soil. Growing the same crop in the same place for many years in a row disproportionately depletes the soil of certain nutrients. With rotation, a crop that leaches the soil of one kind of nutrient is followed during the next growing season by a dissimilar crop that returns, that nutrient to the soil or draws a different ratio of nutrients: for example, rice followed by cotton. 

Strip cropping or strip farming is defined as alternating crop rows between heavy-rooted plants and loosely-rooted plants to minimize erosion. Terracing is the practice of creating nearly level areas in a hillside area. The terraces form a series of steps, each at a higher level than the previous.

Multiple choice evs - i rules are for everyone soil and its conservations soil pollution-control protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

Mulching is a process, that helps in 

  1. Moisture conservation

  2. Weed control

  3. Soil fertility

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mulch is a protective layer of a material, that is spread on top of the soil. Mulches can either be organic - such as grass clippings, straw, bark chips, or inorganic - such as stones, brick chips, and plastic. Materials used as mulches are used to retain soil moisture, regulate soil temperature, suppress weed growth, and for aesthetics. They are applied to the soil surface, around trees, paths, flower beds, to prevent soil erosion on slopes, and in production areas for flower and vegetable crops. Mulch layers are normally two inches or more deep when applied.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas is a good substitute for

  1. Natural gas

  2. Crude oil

  3. Coal

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas is a renewable energy source produced from organic waste. It can serve as a substitute for various conventional fuels like natural gas, coal, and petroleum products in different applications.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Bioenergy is the energy obtained from

  1. Coal

  2. Natural gas

  3. Biomass

  4. Petroleum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Biomass is the amount of organic matter present in an organism. It is the stored form of energy in an organism. Biomass is used to produce bioenergy. Biomass can be of various types such as woods, crops, landfill gas etc. Biomass can be converted to various forms to produce biofuels, biogas etc. Highest amount of biomass is present in plants as they trap solar energy and convert it into mechanical energy in the form of stored food. 
So, the correct answer is 'Biomass'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas contains

  1. $CH _4+CO+CO _2$
  2. $CH _4+CO _2+H _2$
  3. $CO+CO _2+H _2$
  4. $CO+CO _2+NO _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Biogas is a form of energy produced from anaerobic decomposition of waste material and organic matter. It is a renewable source of energy and a good alternative in place of fossil fuels which are depleting with time. Biogas is produced by methanogenic bacteria which breakdown organic matter in the absence of oxygen. They produce biogas which is a mixture of gases like methane (CH4), carbon dioxide (CO2) and hydrogen (H2) in different composition.
So, the correct answer is 'CH4 + CO2 + H2 '.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Bioenergy is obtained from

  1. Petroleum

  2. Natural gas

  3. Biomass

  4. Synthetic fuel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Biomass is the amount of organic matter present in an organism. It is the stored form of energy in an organism. Biomass is used to produce bioenergy. Biomass can be of various types such as woods, crops, landfill gas etc. Biomass can be converted to various forms to produce biofuels, biogas etc. Bioenergy is renewable source energy because it can be replenished over a period of time.
So, the correct answer is 'Biomass'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Hot water of Manikaran is used for generating electricity. It is known as 

  1. Solar energy

  2. Biomass energy

  3. Geothermal energy

  4. Hydroelectric energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Solar energy is energy generated from heat of sun.
B. Biomass energy is generated from the biomass i.e. organic matter of plants and animals which in turn, contains the stored solar energy.
C. Geothermal energy is the energy generated from heat of earth. 
D. Hydroelectric energy is generated using water which is passed over turbines which flow at a high speed and electricity is generated.
Manikaran (located in Himachal Pradesh) hot springs are used to generate geothermal energy because the heat of the water is used to produce electricity.
So, the correct answer is 'Geothermal energy'.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

The scientist could who first demonstrated that nuclear energy be harnessed to produce electrical energy was :

  1. Homi Bhabha

  2. Enrico Fermi

  3. W B Lewis

  4. P A M Dirac
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Enrico Fermi (1901-1954) was an Italian physicist and recipient of the 1938 Nobel Prize in Physics. He created the world's first nuclear reactor, the Chicago Pile- 1.

So, the correct answer id 'Enrico Fermi'.