Air Around Us

False

Feel

Because of air

True

In presence of air

Storm

Air has weight and it occupies space.

Gases

Water cycle

All of these

MixtureBall and socket

Atmosphere is a thick layer of air surrounding the earth.

Space and has weight.

Nitrogen

False

Breathing

True

No, because dust particles may enter into his body.

Dust particles

Mucus

Nitrogen, oxygen, carbon dioxide, water vapour, dust particles and other gases.

21%

78%

Oxygen

Oxygen mask.

Carbon dioxide gas.

Atmosphere.

Through air present in soil.

Photosynthesis.

Air

Air

Ans: b.

Carbon dioxide in the troposphere traps some of this heat, preventing it from escaping thus keep the Earth warm. This trapping of heat is called the "greenhouse effect".

Heat from the Sun warms the Earth's surface but most of it is radiated and sent back into space. Water vapour and carbon dioxide in the troposphere trap some of this heat, preventing it from escaping thus keep the Earth warm. This trapping of heat is called the "greenhouse effect".

Air contains 78 percent nitrogen.

The atmosphere has five different layers that are determined by the changes in temperature that happen with increasing altitude. They are Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.

All living organism need oxygen for the breakdown of digestive food to get energy

Air contains 21 percent oxygen.

Air contains nitrogen, oxygen, water vapour , carbon dioxide and noble gases

Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.

C2 + 2 O2 = 2 CO2

Photosynthesis takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere.

Humidity is the amount of water vapor present in the air. Water vapor is the gaseous state of water and is invisible to the human eye. Humidity indicates the likelihood of precipitation, dew, or fog.

A phenomenon in which the atmosphere of a planet traps radiation emitted by its sun, caused by gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but retain heat radiated back from the planet's surface.

Nitrogen is major essential component of air. Air contains 78 percent of nitrogen.

Pollen is responsible for numerous allergic reactions people experience. Although pollen is found naturally in the air, human activities and choices can increase the amount of pollen in air, and in turn, can cause people to have more severe allergic reactions.

In plants, during photosynthesis, carbon dioxide gas combines with water in the presence of sunlight and chlorophyll and produce oxygen.

The troposphere is the lowest layer of Earth's atmosphere and site of all weather on Earth.

Argon, Helium and neon gases don’t react chemically with any substance. So, they are noble gases.

Packets containing various snacks like chips etc are flushed with nitrogen to remove oxygen before they are sealed. The absence of oxygen does not easily react. Thus, food remains fresh for a long time.

Argon is filed into electric bulbs to prevent the oxidation of their filament.

Neon gas is used for making glow tubes which emit coloured light.

Helium is a very light gas. Therefore, it is used for filling balloons.

Helium is non-combustible in nature

Carbon dioxide gas is dissolved in water under pressure to form plain soda or soda water. On opening the bottle, the pressure is released and the gas escapes with a bristling effervescence that adds fizz to the drink.

Ans: a.

Air contains 0.02 percent of carbon dioxide.

The noble gases or inert gases make a group of chemical elements with similar properties. Under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. Helium ,Neon, Argon, Krypton, Xenon, and the radioactive radon (Rn).

Long-term exposure to polluted air can have permanent health effects such as: Accelerated aging of the lungs. Loss of lung capacity and decreased lung function.

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

Global Warming is caused by a blanket of pollution that traps heat around the earth. This pollution comes from cars, factories, homes, and power plants that burn fossil fuels

Loss of iron metal from iron’s surface in the presence of air and water is called rusting.

Air is colourless, tasteless and odourless gas. It can be compressed and dissolved in water.

Soil air is a continuation of the atmospheric air. Unlike the other components, it is constant state of motion from the soil pores into the atmosphere and from the atmosphere into the pore space. This constant movement or circulation of air in the soil mass resulting in the renewal of its component gases is known as soil aeration.

Ans: b.

Ans: b.

Root is the part of the plant that grows into the soil. It absorb water and minerals from tiny pores present in soil.

A fish breathes by taking water into its mouth and forcing it out through the gill passages. As water passes over the thin walls of the gills, dissolved oxygen moves into the blood and travels to the fish's cells.

A hydrilla plant totally grows underwater. It takes in dissolved oxygen from water

Earthworms "plow" and mix up the soil. Their tunneling loosens the soil so water and nutrients can go downward. The nutrients in worm castings enrich the soil. The slime they secrete contains nitrogen, an important nutrient for plants.

In cetology, a blowhole is the hole at the top of a Cetacean's head through which the animal breathes air. It is homologous with the nostril of other mammals. As whales reach the water surface to breathe, they will forcefully expel air through the blowhole.

Mangroves live in marshy, water-logged land in coastal areas. Their roots have tips that come out of the water and breathe the oxygen from the air.

Ans: c.

Oxygen is present in the spaces and the pores in the soil. This air is called soil air.

Algae are a specific species which helps other plants under water to thrive. Algae are the single biggest producer of oxygen on planet.

Earthworm absorb oxygen through their skin, as they burrow into soil they exhale excess oxygen.

Earthworm absorb oxygen through their skin, as they burrow into soil they exhale excess oxygen.

Plant and animal need water to live. Water is an essential for every living being. It plays an important role in a large number of life processes.

All are burrowing soil animals, lives in soil.

Take some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Well before the water begins to boil, look carefully at the inner surface of the vessel. You will see tiny bubbles on the inside. These bubbles come from the air dissolved in water. When you heat the water, to begin with, the air dissolved in it escapes. As you continue heating, the water itself turns into vapour and finally begins to boil.

Aquatic animals breathe air or extract its oxygen from that dissolved in water through specialized organs called gills, or directly through its skin.

Ans: a.

Ans: b.

Ans: c.

Ans: a.

Pollination is a very important part of the life cycle of plants. Insects, birds, bats and the wind take pollen between flowering plants, which means the plants can make seeds and reproduce

Ans: a.

Ans: c.

It is obvious that animals cannot live without plants. Similarly, plants can not survive for long without animals. They would consume all the carbon dioxide in the atmosphere. We can see that both need each other, as the balance of oxygen and carbon dioxide in the atmosphere is thus maintained. This shows the interdependence of plants and animals.

During process of photosynthesis, a plant takes oxygen and gives out carbon dioxide.

Aeroplane, parachutes and gliders all replaces atmospheric oxygen.