Answer: (b) Absorption and re-emission of infrared radiations by the atmosphere

Explanation: The greenhouse effect can be defined as the process by which radiation from the planet’s atmosphere warms the planet’s surface to the temperature above what it would be without this atmosphere.

Answer: (d) Accumulation of salts in the soil

Explanation: Salinization is the process of increasing the salt content in the soil. Salts enter the soil via irrigation. Depletion of vegetation occurs due to the increased salinization of the soil.

Answer: (c) Due to the scattering of sunlight by air molecules

Explanation: A clear and cloudless sky is blue because the air molecules scatter blue light more than the red light from the sun. At the time of sunset, we see orange and red colors because of the scattering out of blue light.

Answer: (c) Acid rain

Explanation: When rain droplets absorb the sulphur and nitrogen oxides present in the air pollution, it will be acid rain. Acid rain weakens the trees. Acid rain makes the water more acidic which results in more absorption of aluminum in the soil, which is carried into streams and lakes.

Answer: (a) It is the gaseous phase of water

Explanation: Water vapor can be defined as the gaseous phase of water which is produced due to the evaporation or boiling of liquid water. It can be produced due to the ice sublimation. It is transparent in nature.

Answer: (c) Ozone depletion

Explanation: Skin cancer can be defined as the abnormal growth of skin cells. Ozone depletion means the thinning of the ozone layer present in the upper atmosphere. It is very harmful to nature and the atmosphere. It might result in various health issues such as skin cancer, etc.

Answer: (a) Acid rain

Explanation: None

Answer: (b) Stomata

Explanation: Stomata are a pore that is found in the epidermis of leaves, stems and other organs of the plants. It controls the rate of gas exchange.

Answer: (d) when the air temperature is higher

Explanation: None

Answer: (a) Winter sleep

Explanation: Hibernation is said to be the winter sleep. In this sleep, an organism tends to pass the time in dormant conditions. Animals look for a warm place to sleep.

Answer: (b) Summer sleep

Explanation: Aestivation is said to be the summer sleep. In aestivation animals usually look for a cool and shady place to sleep.

Answer: (a) Nitrogen

Explanation: Nitrogen is present in the maximum amount of air. Approximately the nitrogen takes 78.09% in air. Whereas oxygen occupies about 20.95% amount in the air.

Answer: (b) Solar energy

Explanation: Solar power energy harnessed directly from the Sun, where photovoltaic cells convert the Sun’s rays directly into electrical energy. In some cases, the heat produced by sunshine is harnessed to produce electricity, known as solar-thermal power.

Answer: (c) Wind

Explanation: Renewable energy sources are also the same as alternative energy sources. Renewable energy is energy that is generated from natural processes that are continuously replenished. It includes sunlight, geothermal heat, wind, tides, water, and various forms of biomass.

Answer: (a) Melting

Explanation: Melting is the process of changing the solid into a liquid when the heat is supplied to it. Melting occurs when the internal energy of solid increases by supplying heat or pressure.

Answer: (c) Eggshell

Explanation: Eggshells are biodegradable and can decompose very quickly. An eggshell has a calcium carbonate of about 95%.

Answer: (a) Carbohydrate

Explanation: Sugar is a term that generally refers to sweet-flavored substances. Carbohydrates are an important source of fuel for our body. Sugar is a generic name for soluble carbohydrates.

Answer: (d) All of the above

Explanation: Chlorofluorocarbons (CFSs) are used to manufacture the blowing agents for foams and packing materials as refrigerants and as solvents. They are also used to manufacture aerosol sprays.

Answer: (a) Light

Explanation: The speed of light is the speed at which the light waves propagate through different materials. The speed of light in meter per second is 299 792 458 m / s.

Answer: (c) Biodegradable pollutants

Explanation: A Biodegradable substance can be defined as a material that can be easily decomposed by microorganisms or decomposers. They can be easily decomposed and manageable, so they do not add any type of pollution.

Answer: (c) Stratosphere

Explanation: The stratosphere is the second major layer of the earth’s atmosphere. It is present below the mesosphere and just above the troposphere. The ozone layer is a region of the stratosphere that absorbs most of the ultraviolet radiation from the sun.

Answer: (c) Insecticide

Explanation: Substances that are used to kill insects are insecticides. Insecticides include larvicides and ovicides that are used against eggs and larvae of insects.

Answer: (c) Grass and Bamboo

Explanation: Paper is a thin and flat material that is made up of crushed wood or cloth. It is generally used for writing, printing, drawing, etc.

Answer: (a) Venus

Explanation: Venus is the second planet from the sun and the hottest planet in the solar system. Although Mercury is the first planet closer to the sun, it is the second hottest planet of the solar system. The mean temperature of Venus is 464 degrees Celsius, whereas the mean temperature of mercury is 167 degrees Celsius.

Answer: (c) SO₂

Explanation: Sulpur dioxide (SO₂) is the pollutant that causes the bleaching of plants. The chlorophyll pigment which is present in the plant leaves is destroyed due to the presence of a high amount of sulfuric acid.

Answer: (d) Central pollution control board

Explanation: The Central Pollution Control Board (CPCB) was established in 1974. It provides technical services to the ministry of environment and forests. It promotes the cleanliness of streams and wells in different areas of the states to prevent and control water pollution.

Answer: (d) All of the above

Explanation: Noise pollution is defined as an excessive amount of noise that affects the environment in a disruptive manner. Although noise pollution is not visible and does not smell like air pollution, it still disrupts the natural balance. Some common effects of noise pollution on human beings include Hearing loss or disorder, Stress and headache, High blood pressure (hypertension or high BP), and many more.

Answer: (b) Madhya Pradesh

Explanation: Madhya Pradesh has the highest number of tigers in the country. It is also known as the Tiger state of India. The state recorded the highest tiger count in India, which is about 526.

Answer: (a) 2^nd October to 8^th October

Explanation: Wildlife week is annually celebrated in India from 2^nd October to 8^th October. It is celebrated with the aim to protect flora and fauna in India.

Answer: (c) Moon

Explanation: The objects that do not emit light energy by themselves are said to be non-luminous objects. For example, Moon, spoon, etc.

Answer: (b) Neptune

Explanation: Neptune is the coldest planet in our solar system. Neptune is the eighth planet of our solar system, and therefore it is the farthest planet from the sun. Neptune is the fourth-largest planet in the solar system.

Answer: (c) 5^th June

Explanation: World environment is celebrated on 5^th June every year. It is celebrated to encourage awareness for the protection of the environment.

Answer: (d) India

Explanation: None

Answer: (c) Chemical energy

Explanation: A battery stores the chemical energy and converts it into electrical energy. A battery usually consists of a group of cells and can supply the power for long durations. A cell is a single unit device that also converts chemical energy into electrical energy.

Answer: (c) Mercury

Explanation: Mercury is the only metal that remains in the liquid state at room temperature. Mercury has a boiling point, so it is suitable to measure the higher temperatures. It is used in thermometers because of the high coefficient of expansion.

Answer: (c) Compressed natural gas.

Explanation: CNG stands for Compressed Natural Gas. It mainly comprises methane gas, which can produce engine power after it is mixed with air and fed into an engine’s combustion chamber. So, it can be used as a substitute for Diesel, Petrol and Propane/LPG. It is effective to control air pollution because it produces fewer undesirable gases in comparison to Diesel, Petrol and LPG.

Answer: (d) 4

Explanation: The human heart is divided into four chambers that are upper left, right atria, lower left and right ventricles.

Answer: (a) Solid

Explanation: The particles in the solid have very little space between them.

Answer: (b) Nicotine

Explanation: When Nicotine is taken in small amounts, it causes pleasant feelings and distracts the user from the unpleasant feelings. This makes the user wants to use tobacco more.

Answer: (b) Madhya Pradesh, Bihar, Haryana, Rajasthan, Delhi

Explanation: There are nine neighboring states of Uttar Pradesh. These states are – Rajasthan, Haryana, Himachal Pradesh, Delhi, Uttarakhand, Bihar, Madhya Pradesh, Chhattisgarh, and Jharkhand.

Answer: (b) Calorie

Explanation: Temperature is a measure of the hotness or coldness of an object. Temperature is measured in various scales such as Kelvin, Celsius and Fahrenheit.

Answer: (c) Jim Corbett National park

Explanation: Jim Corbett National Park is the oldest national park in India, spread over 500 square kilometers. It is situated in the district of Nainital in the state of Uttarakhand, India and is also a part of Corbett Tiger Reserve. It got its name from Jim Corbett that was a hunter who later became a conservationist.

Answer: (c) Green Plants

Explanation: The Food chain is the flow of energy from the lower trophic level to the higher trophic through a single direct route level. In a food chain, producers contain all green plants, and this is the initial stage in a food chain.

Answer: (b) Herbivores

Explanation: Animals whose primary source of food is based on plants are called herbivores. Examples of herbivores animals are a cow, goat, sheep, giraffe, and many more.

Answer: (c) Hygrometer

Explanation: A hygrometer is used as a weather instrument as it is designed to measure the humidity in the air or atmosphere. Humidity is the amount of water vapor present in the atmosphere. The uncomfortable sticky feeling in summers is due to the high humidity in the air.

Answer: (d) Geothermal energy

Explanation: Geothermal power energy is generated by heat and steam produced by geological activity in the Earth’s crust. In most cases, this consists of pipes being placed in the ground above geologically active zones to channel steam through turbines, thus generating electricity.

Answer: (c) the study of amphibians and reptiles

Explanation: Herpetology is concerned with the study of amphibians and reptiles. It is a branch of zoology.

Answer: (c) Chlorophyll

Explanation: Photosynthesis is a biological process through which plants manufacture their food with light from the sun and inorganic sources. They produce glucose molecules. In turn, the plants serve as a food source for organisms incapable of producing their food.

Answer: (a) 1973

Explanation: Project tiger was launched in 1973 from Jim Corbett National park, Uttarakhand, by the Indira Gandhi Government.

Answer: (d) 2007

Explanation: The year 2007 was declared as the water year by the Indian Government.