Answer

Answer is (d) re-radiated by land and water

Explanation:

Heat from sun reaches earth and water through sunrays. This heat is reradiated by earth and water to convert atmosphere hot.

Answer

Answer is (c) increase during day and decrease during night

Explanation:

Because atmosphere prevent a lot of heat from reaching earth’s surface. Atmosphere also prevent escape of heat in the night. Hence atmosphere is responsible for maintain an ambient temperature.

Answer

Answer is (b) It will become poisonous and kill living forms

Explanation:

Most of the organisms live on earth required oxygen for their living If oxygen convert to ozone living beings will get killed.

Answer

Answer is (d) polythene bags

Explanation:

Polythene bags pollutes the soil and converts the soil infertile.

Answer

Answer is (c) ozone and oxygen

Explanation:

Ozone is an allotropic form of oxygen.

Answer

(b) elemental form of oxygen

Answer

Answer is (b) the number of water bodies in an area

Explanation:

Water bodies provide water for evaporation which are converted into clouds and bring rainfall. Lack of water bodies also reduce the humidity which will affect the rainfall pattern.

Answer

Answer is (a) They are eco-friendly

Answer

Answer is (a) a biological process of nitrogen fixing bacteria present in soil

Explanation:

Cereal plants cannot fix the nitrogen on their own. They comprise of bacteria in their root nodules which will convert nitrates to nitrites. This process is called as nitrogen fixation.

Answer

Answer is (d) photosynthesis

Explanation:

Photosynthesis is a part of carbon cycle but not water cycle.

Answer

Answer is (c) A change in pressure of the water bodies

Explanation:

Physical causes lead to change in pressure on water bodies. Hence change in water pressure will not affect pollution of water.

Answer

Answer is (d) Ammonia

Answer

Answer is (b) Transpiration

Explanation:

Transpiration is the process of exhaling water from trees. Transpiration is a part of water cycle.

Answer

Answer is (b) thinning of the ozone layer

Answer

Answer is (c) excessive use of man-made compounds containing both fluorine and chlorine

Explanation:

Carbon and fluorine reacts with ozone to convert it into oxygen. This results in thinning of ozone lays which is called as ozone depletion.

Answer

Answer is (d) All of the above

Answer

Answer is (b) It comes out with the CO2 during exhalation

Explanation:

Nitrogen is the most abundant gas in nature hence while inhalation Nitrogen goes inside our body along with oxygen. But Nitrogen is not utilized by our body and it is exhaled along with carbon-di-oxide.

Answer

Answer is (d) Humus, living organisms and soil particles.

Answer

Answer is (b) CO2 in atmosphere $\rightarrow$ organic carbon in plants $\rightarrow$ organic carbon in animals $\rightarrow$ inorganic carbon in soil .

Explanation:

Green plants utilize atmospheric carbon-dioxide during photosynthesis to make organic compounds. When animals eat plants organic compounds will go to animals. When plant or animals die they get decomposed to turn into in-organic carbon.

Answer

Answer is (a) parent rock from which soil is formed

Explanation:

Rock weathering is a process which forms soil. Rocks are naturally occurring soil aggregates which are rich in minerals. Hence rock is the source of minerals in the soil.

Answer

Answer is (a) $75 \%$

Explanation:

$96.5 \%$ of the water is found in sea’s and oceans , $17 \%$ is groundwater, $1.7 \%$ in icecaps and glaciers. $0.001 \%$ as vapor and $2.5 \%$ fresh water.

Answer

Solution is (d) air

Explanation :;

Biotic component of biosphere comprise of living entities, air is a non-living component hence air is not a biotic component.

Answer

Answer is (d) abundance of desert plants

Explanation:

Increase in $CO_2$ content will not favor growth of desert plants because plants also require, oxygen, minerals and water to growth and development.

Answer

Answer is (c) photosynthesis

Explanation:

Plants take CO2 from environment and they return back oxygen by a process called photosynthesis.

Answer

Answer is (b) unburnt carbon particles or hydrocarbons suspended in air

Explanation:

Unburnt carbon particles and Hydrocarbons suspend in air to create smog. Because of smog visibility will be low in cold weather.

Answer

Answer is (a) moss

Explanation:

Lichens releases certain enzymes which makes the rock suitable for the growth of moss. Further moss lead to the formation of soil which will allow higher plants to grow.

Answer

Answer is (a) breeding of animals

Explanation:

Most aquatic animals are cold blooded. Their egg and larvae are highly susceptible to temperature changes hence breeding of animals gets affect from temperature changes.

Answer

Answer is (a) raising forests

Explanation:

Trees in the forest hold on the soil by its roots. Hence growing forest can prevent soil erosion.

Answer

b) Rain water causes loss of surface soil

Explanation:

Roots hold on the surface soil and helps them to get washed away from current of water due to rainfall. When there is no vegetation surface soil gets washed away.

Answer

Answer is (b) nitrogen fixing bacteria

Explanation:

Nitrogen fixing bacteria are anaerobic, they get killed when exposed to oxygen hence oxygen is harmful for them.

Answer

When we burn fossil fuels carbon-do-oxide, nitrous oxide and other chemicals are released which increase the green-house effect and contribute to global warming. Nitrous oxide forms smog and results in acid rain.

Answer

Loss of top soil can be stopped by 1) Afforestation 2) Crop rotation 3)Counter farming 4) proper irrigation methods.

Answer

Addition of pollutants like fertilizers and chemicals to the water bodies will bring disease to aquatic organisms. Pollutants increases the oxygen requirement in aquatic life. Pollutants also decrease the dissolved oxygen in the water which will affect the aquatic life adversely.

Answer

Lake water gets evaporated and vapors due to evaporation creates a cooling effect near lake. Hence we feel relieved from heat.

Answer

During day time land heats more than sea.This create a low pressure in the land and wind always move from low pressure to high pressure regions. Similarly in the night land cools faster and sea remains hot making wind to move from sea to land.

Answer

Answers are (a) lichen (b) mosses

Explanation:

Lichens grow on rocks and releases certain enzymes which favor the growth of mosses. Mosses forms clumps of soil from rock which results in formation of top soil.

Answer

Abiotic factors;

Sun, water and wind

Biotic Factors:

Lichens, mosses and trees.

Answer

C, N, S, P, H and O are enter the living community through plants. Carbon comes through photosynthesis and nitrogen are obtained through nitrogen fixing bacteria. Sulphur and Phosphorus are absorbed from soil. Hydrogen and oxygen are obtained by water. These nutrients are obtained by animals from plants.

Answer

These gases are used by human beings for their growth and development. But these are returned back to environment in one or other form. This process of using natural resources and giving them back to nature is called as Bio-Geo Chemical cycle. Because of Bio-Geo Chemical cycle percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere.

Answer

Earth has atmosphere which prevents over heating of the earth during day time. On the other hand Moon does not have atmosphere hence it appears to be hotter during day time. Lack of atmosphere in moon also allows the heat to escape during night because of this phenomenon temperature varies on moon surface.

Answer

Near the sea shore breeze blows during day time which is ideal for flying kites.

Answer

Mathura refinery releases oxides of Sulphur which causes acid rain. Acid rain corrodes the marble of tajmahal hence Mathura refinery pose problems to Tajmahal.

Answer

Lichens are sensitive to Sulphur oxide released by automobiles. Delhi has more number of automobiles which increase the pollution. Pollution avoids lichens in Delhi.

Answer

Sea water is not suitable for livelihood of humans and plants. Fresh water resources are limited hence they need to be conserved.

Answer

Reasons for mortality of fishes in a pond are i) Thermal pollution ii) addition of mercuric compounds and other toxic chemicals iii) Blockage of gills by pollutants.

Answer

Lichens releases enzymes that break the rock into smaller pieces and helps in formation of soil.

Answer

Water causes soil formation by following steps.

1. Water causes wear off of rock for a long period of time.

2. Water makes rubbing between the rocks to smaller particles which are deposited as soil.

3. On freezing, water expands to cause breaks in the rock.

Answer

Fertile soil has a number of microorganisms that decomposes dead and organic matter to convert to humus. Humus provides nutrients, absorb water and makes soil porous.

Answer

In hills there are steep slopes which risk washout of topsoil by wind and rain. In order to conserve top soil step farming is done in hills.

Answer

Root nodules are the home for nitrogen fixing bacteria called a Rhizobium. Rhizobium fixes atmospheric nitrogen thereby increasing soil fertility.

Answer

Fossil fuels like petrol, diesel and kerosene releases oxide of Sulphur, nitrogen and carbon. Sulphur and Nitrogen oxides causes acid rain.

Burning fossil fuels release carbon monoxide which increase the carbon-di-oxide in the atmosphere which will affect living organisms.

Burning of fuels increase the amount of suspended particles in the air which reduces the visibility.

Answer

Causes of water pollution are given below

1. Chemical Fertilizers and pesticides consists of poisonous chemical which reach the water body to turn water into toxic.

2. Dumping of sewage directly into water bodies

3. Release of industrial effluents into water resources.

Below are the steps we can take to reduce water pollution

1. Stop connecting sewage lines directly to water bodies.

2. Avoiding throwing garbage and other domestic waste into water resource.

3. Prevent dumping of toxic chemical into water body.

4. Avoid washing of clothes near water bodies.

Answer

Infrared radiation emitted by the sun can pass the transparent glass and increases the temperature inside the car. These radiations have smaller wavelength than the radiations emitted by the car. For these waves transparent glass remain opaque further increasing the temperature.

Answer

Dust is a fine powder of tiny earth particles and waste matter. It is carried to the atmosphere by wind, dust causes allergy in humans and affects plant growth by blocking the stomata on the leaf surface. Dust also carries toxic substance from the environment to pollute the water bodies affecting the aquatic life.

Answer

Sunlight heats the rock in the afternoon which results in the expansion of rock. When it cools down in the night contraction takes place which is not at the rate of expansion. Because of this difference in the rate of expansion and contraction rock get cracked to form small rock particles.

Answer

Carbon-di-oxide is considered as a pollutant because it is a green-house gas which is responsible for the global warming. This results in change of earth’s climate. Along with that excess $CO_2$ is harmful for the plants. Increased $CO _2$ levels changes physiology, growth and chemistry of plants. High CO2 concentration also causes suffocation, hard breathing and choking issues.