Coal and petroleum are the fossil fuels. They are burnt to get energy. Combustion of fossil fuels produces (i) suspended particles, (ii) sulphur oxides; (iii) nitrogen oxides; (iv) carbon dioxide; (v) carbon monoxide; (vi) vapours of hydrocarbons' All these are air pollutants. Hydrocarbons act as aRead more
Coal and petroleum are the fossil fuels. They are burnt to get energy. Combustion of fossil fuels produces (i) suspended particles,
(ii) sulphur oxides;
(iii) nitrogen oxides;
(iv) carbon dioxide;
(v) carbon monoxide;
(vi) vapours of hydrocarbons’ All these are air pollutants. Hydrocarbons act as a source of nitrogen cancer. Along with oxides, they produce ozone and smong. Sulphur and nitrogen oxides give rise to acid rain They are also irritatants and damage eyes and nasal tract.
Root nodules mostly occur in the legume plants. These nodules contain nitrogen fixing bacteria named Rhizobium' The bacteria picks up nitrogen from soil atmosphere and convert it into organic compounds. The same pass into the plant so that legumes (e.g., pea, gram) become rich in proteins and otherRead more
Root nodules mostly occur in the legume plants. These nodules contain nitrogen fixing bacteria named Rhizobium’ The bacteria picks up nitrogen from soil atmosphere and convert it into organic compounds. The same pass into the plant so that legumes (e.g., pea, gram) become rich in proteins and other nitrogen compounds.
Step farming is also called terracing. It is carried out in the hills because terracing slows down the speed of rain water currents, checks soil erosion and increase water absorption by the soil.
Step farming is also called terracing. It is carried out in the hills because terracing slows down the speed of rain water currents, checks soil erosion and increase water absorption by the soil.
Fertile soil contains sufficient amount of humus because (i) Humus is required for binding soil particles into crumbs. Crumb formation helps in both hydration and aeration of soil. (ii) Humus makes the soil porous for easy passage of plant roots. (iii) Humus is a source of mineral. (iv) Humus contaiRead more
Fertile soil contains sufficient amount of humus because (i) Humus is required for binding soil particles into crumbs. Crumb formation helps in both hydration and aeration of soil. (ii) Humus makes the soil porous for easy passage of plant roots. (iii) Humus is a source of mineral. (iv) Humus contains chemicals that promote growth of plants.
Yes, water causes weathering of rocks by following three methods. 1. Wetting and drying. Certain constituents of rocks can pick up moisture and swell up. They contract on drying. Such components (1.e., chemicals) help in breaking of rocks. 2. Frost action. Water seeps into rock crevices and cracks aRead more
Yes, water causes weathering of rocks by following three methods.
1. Wetting and drying. Certain constituents of rocks can pick up moisture and swell up. They contract on drying. Such components (1.e., chemicals) help in breaking of rocks.
2. Frost action. Water seeps into rock crevices and cracks and may freeze if the temperature goes below O°C. Frozen water expands and exerts a huge pressure sufficient to break all rocks.
3. Abrasion. Beating of rocks by rain and hail, wave action on shores and abrasion caused by trumbling rock fragments in running water batter and grind the rocks into smaller and smaller particles. Water carries these particles depositing them downstream. This produces soil (e.g., sand particles) at a far away place from the parent rock.
Lichens release small quantity of acids which corrode the surface of rock creating minute pores and releasing minerals. With the passage of time these minerals deposit on rock to form a thin layer of soil.
Lichens release small quantity of acids which corrode the surface of rock creating minute pores and releasing minerals. With the passage of time these minerals deposit on rock to form a thin layer of soil.
In a pond, a mass mortality of fish may occur due to following seasons. (i) Passage of pesticide rich water from crop fields. (ii) Release of toxic industrial waste. (iii) Pouring of hot water from an industry or thermal power plant. (iv) Release of waste rich in heavy metals and mercury. (v) BlockaRead more
In a pond, a mass mortality of fish may occur due to following seasons.
(i) Passage of pesticide rich water from crop fields.
(ii) Release of toxic industrial waste.
(iii) Pouring of hot water from an industry or thermal power plant.
(iv) Release of waste rich in heavy metals and mercury.
(v) Blockage of gills of fish by some suspended pollutant such as oil.
Salt water of seas and oceans is unfit for consumption by humans, animals, land plants or industries. Therefore, terrestrial biota and human beings have to depend upon fresh-water resources available on land (such as water present in rain snow, springs, river, lakes, ponds and other freshwater bodieRead more
Salt water of seas and oceans is unfit for consumption by humans, animals, land plants or industries. Therefore, terrestrial biota and human beings have to depend upon fresh-water resources available on land (such as water present in rain snow, springs, river, lakes, ponds and other freshwater bodies (only about 0.5% of the total water on earth). As a result, freshwater needs its conservation
Lichens act as indicators of air pollution. They are sensitive to sulphur dioxide which occurs in sufficient quantity in the atmosphere of Delhi due to large number of vehicles, homes and factories using fossil fuels., Also Delhi exists in semiarid area where atmospheric moisture is low. In Manali aRead more
Lichens act as indicators of air pollution. They are sensitive to sulphur dioxide which occurs in sufficient quantity in the atmosphere of Delhi due to large number of vehicles, homes and factories using fossil fuels., Also Delhi exists in semiarid area where atmospheric moisture is low. In Manali and Darjeeling, the atmosphere is humid and has comparatively low contents of sulphur dioxide.
Mathura refinery emits hydrocarbons and sulphur oxides in its exhaust/fumes. Hydrocarbons induce the formation of ozone which is highly oxidizing. Sulphur dioxide produces acid rain which has a corroding effect on marble. As a result, Mathura refinery does pose problems to Taj Mahal.
Mathura refinery emits hydrocarbons and sulphur oxides in its exhaust/fumes. Hydrocarbons induce the formation of ozone which is highly oxidizing. Sulphur dioxide produces acid rain which has a corroding effect on marble. As a result, Mathura refinery does pose problems to Taj Mahal.
How did fossil fuels cause air pollution?
Coal and petroleum are the fossil fuels. They are burnt to get energy. Combustion of fossil fuels produces (i) suspended particles, (ii) sulphur oxides; (iii) nitrogen oxides; (iv) carbon dioxide; (v) carbon monoxide; (vi) vapours of hydrocarbons' All these are air pollutants. Hydrocarbons act as aRead more
Coal and petroleum are the fossil fuels. They are burnt to get energy. Combustion of fossil fuels produces (i) suspended particles,
See less(ii) sulphur oxides;
(iii) nitrogen oxides;
(iv) carbon dioxide;
(v) carbon monoxide;
(vi) vapours of hydrocarbons’ All these are air pollutants. Hydrocarbons act as a source of nitrogen cancer. Along with oxides, they produce ozone and smong. Sulphur and nitrogen oxides give rise to acid rain They are also irritatants and damage eyes and nasal tract.
Why are root nodules useful for the plants?
Root nodules mostly occur in the legume plants. These nodules contain nitrogen fixing bacteria named Rhizobium' The bacteria picks up nitrogen from soil atmosphere and convert it into organic compounds. The same pass into the plant so that legumes (e.g., pea, gram) become rich in proteins and otherRead more
Root nodules mostly occur in the legume plants. These nodules contain nitrogen fixing bacteria named Rhizobium’ The bacteria picks up nitrogen from soil atmosphere and convert it into organic compounds. The same pass into the plant so that legumes (e.g., pea, gram) become rich in proteins and other nitrogen compounds.
See lessWhy step farming is common in hills?
Step farming is also called terracing. It is carried out in the hills because terracing slows down the speed of rain water currents, checks soil erosion and increase water absorption by the soil.
Step farming is also called terracing. It is carried out in the hills because terracing slows down the speed of rain water currents, checks soil erosion and increase water absorption by the soil.
See lessFertile soil has lots of humus. Why?
Fertile soil contains sufficient amount of humus because (i) Humus is required for binding soil particles into crumbs. Crumb formation helps in both hydration and aeration of soil. (ii) Humus makes the soil porous for easy passage of plant roots. (iii) Humus is a source of mineral. (iv) Humus contaiRead more
Fertile soil contains sufficient amount of humus because (i) Humus is required for binding soil particles into crumbs. Crumb formation helps in both hydration and aeration of soil. (ii) Humus makes the soil porous for easy passage of plant roots. (iii) Humus is a source of mineral. (iv) Humus contains chemicals that promote growth of plants.
See less“Soil is formed by water.” If you agree with this statement, then give reasons.
Yes, water causes weathering of rocks by following three methods. 1. Wetting and drying. Certain constituents of rocks can pick up moisture and swell up. They contract on drying. Such components (1.e., chemicals) help in breaking of rocks. 2. Frost action. Water seeps into rock crevices and cracks aRead more
Yes, water causes weathering of rocks by following three methods.
See less1. Wetting and drying. Certain constituents of rocks can pick up moisture and swell up. They contract on drying. Such components (1.e., chemicals) help in breaking of rocks.
2. Frost action. Water seeps into rock crevices and cracks and may freeze if the temperature goes below O°C. Frozen water expands and exerts a huge pressure sufficient to break all rocks.
3. Abrasion. Beating of rocks by rain and hail, wave action on shores and abrasion caused by trumbling rock fragments in running water batter and grind the rocks into smaller and smaller particles. Water carries these particles depositing them downstream. This produces soil (e.g., sand particles) at a far away place from the parent rock.
Lichens are called pioneer colonisers of bare rock. How can they help in formation of soil?
Lichens release small quantity of acids which corrode the surface of rock creating minute pores and releasing minerals. With the passage of time these minerals deposit on rock to form a thin layer of soil.
Lichens release small quantity of acids which corrode the surface of rock creating minute pores and releasing minerals. With the passage of time these minerals deposit on rock to form a thin layer of soil.
See lessThere is a mass mortality of fish in a pond. What may be the reasons?
In a pond, a mass mortality of fish may occur due to following seasons. (i) Passage of pesticide rich water from crop fields. (ii) Release of toxic industrial waste. (iii) Pouring of hot water from an industry or thermal power plant. (iv) Release of waste rich in heavy metals and mercury. (v) BlockaRead more
In a pond, a mass mortality of fish may occur due to following seasons.
See less(i) Passage of pesticide rich water from crop fields.
(ii) Release of toxic industrial waste.
(iii) Pouring of hot water from an industry or thermal power plant.
(iv) Release of waste rich in heavy metals and mercury.
(v) Blockage of gills of fish by some suspended pollutant such as oil.
Why does water need conservation even though large oceans surround the land masses?
Salt water of seas and oceans is unfit for consumption by humans, animals, land plants or industries. Therefore, terrestrial biota and human beings have to depend upon fresh-water resources available on land (such as water present in rain snow, springs, river, lakes, ponds and other freshwater bodieRead more
Salt water of seas and oceans is unfit for consumption by humans, animals, land plants or industries. Therefore, terrestrial biota and human beings have to depend upon fresh-water resources available on land (such as water present in rain snow, springs, river, lakes, ponds and other freshwater bodies (only about 0.5% of the total water on earth). As a result, freshwater needs its conservation
See lessWhy do not lichens occur in Delhi where as they commonly grow in Manali or Darjeeling?
Lichens act as indicators of air pollution. They are sensitive to sulphur dioxide which occurs in sufficient quantity in the atmosphere of Delhi due to large number of vehicles, homes and factories using fossil fuels., Also Delhi exists in semiarid area where atmospheric moisture is low. In Manali aRead more
Lichens act as indicators of air pollution. They are sensitive to sulphur dioxide which occurs in sufficient quantity in the atmosphere of Delhi due to large number of vehicles, homes and factories using fossil fuels., Also Delhi exists in semiarid area where atmospheric moisture is low. In Manali and Darjeeling, the atmosphere is humid and has comparatively low contents of sulphur dioxide.
See lessWhy does Mathura refinery pose problems to the Tai Mahal?
Mathura refinery emits hydrocarbons and sulphur oxides in its exhaust/fumes. Hydrocarbons induce the formation of ozone which is highly oxidizing. Sulphur dioxide produces acid rain which has a corroding effect on marble. As a result, Mathura refinery does pose problems to Taj Mahal.
Mathura refinery emits hydrocarbons and sulphur oxides in its exhaust/fumes. Hydrocarbons induce the formation of ozone which is highly oxidizing. Sulphur dioxide produces acid rain which has a corroding effect on marble. As a result, Mathura refinery does pose problems to Taj Mahal.
See less