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Q1. The Earth is getting warmer because of:
Greenhouse gases trap heat from the sun inside the Earth’s atmosphere. This trapped heat makes the Earth warmer day by day.
Q2. A greenhouse is a:
A greenhouse is a glass building that traps heat inside to keep plants warm. The glass lets sunlight in but stops heat from escaping.
Q3. Gases that trap heat in the Earth’s atmosphere are called:
Greenhouse gases like carbon dioxide and methane trap heat in the air. They act like the glass of a greenhouse and warm the Earth.
Q4. Which of these is a greenhouse gas?
Carbon dioxide is the main greenhouse gas released by burning fuels. It traps heat in the atmosphere and causes global warming.
Q5. The gradual increase in the Earth’s temperature is called:
Global warming means the Earth’s temperature is slowly rising. This is caused by too many greenhouse gases in the air.
Q6. Global warming causes the ice in polar regions to:
As the Earth gets warmer, ice at the North and South Poles begins to melt. This melting causes the sea level to rise.
Q7. Due to global warming, the sea level is:
As polar ice melts due to global warming, more water flows into the oceans. This makes the sea level rise.
Q8. Which of the following helps to reduce global warming?
Trees absorb carbon dioxide from the air and give out oxygen. Planting more trees reduces greenhouse gases.
Q9. The thinning of the ozone layer is called:
Ozone depletion means the ozone layer is becoming thinner. This happens because of harmful chemicals released by humans.
Q10. The ozone layer is found in the:
The ozone layer is a protective layer in the Earth’s atmosphere. It is present high above the Earth’s surface.
Q11. The main function of the ozone layer is to:
The ozone layer acts like a shield for the Earth. It blocks harmful ultraviolet rays from the Sun.
Q12. The main cause of ozone depletion is:
CFCs are chemicals used in refrigerators and air conditioners. They rise into the atmosphere and destroy the ozone layer.
Q13. Ozone depletion can cause:
When the ozone layer becomes thin, harmful UV rays reach the Earth. These rays can cause skin cancer and cataracts in eyes.
Q14. Which of these is an alternative source of energy?
Solar energy is a clean and renewable source of energy. It does not cause pollution like coal or petrol.
Q15. Solar energy comes from the:
Solar energy is the energy we get from the sun’s rays. It can be converted into electricity using solar panels.
Q16. Which of these is a renewable source of energy?
Wind energy is made by the moving air and is renewable. Windmills use this energy to produce electricity.
Q17. Global warming can cause:
As the Earth warms up, glaciers and ice sheets melt. This extra water causes the sea level to rise.
Q18. The greenhouse effect is:
The greenhouse effect is a natural process that keeps the Earth warm enough for living things. Without it, Earth would be very cold.
Q19. The enhanced greenhouse effect is caused by:
When humans burn coal, petrol and diesel, they release extra greenhouse gases. This makes the greenhouse effect too strong.
Q20. One way to save our environment is to:
Reducing waste, reusing items and recycling materials helps save the environment. It reduces pollution and saves resources.
Q21. Which gas is released by vehicles that causes global warming?
Vehicles burn petrol and diesel, which release carbon dioxide. This gas adds to the greenhouse effect and causes global warming.
Q22. The solar panels are used to:
Solar panels capture sunlight and convert it into electrical energy. This is a clean and pollution-free way to make electricity.
Q23. Which renewable energy comes from flowing water?
Hydroelectric energy is made from the energy of flowing or falling water. Dams use this energy to produce electricity.
Q24. Ozone is a form of:
Ozone is a special form of oxygen with three atoms instead of two. It is found high in the Earth’s atmosphere.
Q25. The ozone hole was first discovered over:
A large hole in the ozone layer was discovered over Antarctica in the 1980s. It was caused by CFC chemicals.
Q26. Which human activity damages the ozone layer?
CFCs used in old refrigerators and air conditioners escape into the air. They rise and destroy the ozone layer.
Q27. The harmful rays blocked by the ozone layer are called:
UV rays are very harmful rays from the sun. The ozone layer stops most of these rays from reaching the Earth’s surface.
Q28. Global warming can cause changes in:
Global warming affects many things on Earth. It changes weather patterns, warms oceans and harms plants and animals.
Q29. The main source of energy on Earth is the:
The Sun is the main source of energy for our planet. It provides light, heat and helps plants grow.
Q30. Which of these is a non-renewable source of energy?
Coal is a non-renewable source because it takes millions of years to form. Once used, it cannot be replaced quickly.
Q31. The temperature of the Earth is rising because:
Extra carbon dioxide in the air traps more heat. This makes the Earth’s temperature rise over time.
Q32. One way to save energy and reduce global warming is:
Turning off unused lights and appliances saves electricity. This reduces the burning of fossil fuels and helps the environment.
Q33. Global warming is a problem because it causes:
Melting ice caps cause sea levels to rise. This can lead to flooding in coastal areas and destroy homes.
Q34. CFCs are harmful because they:
CFCs react with ozone molecules and destroy them. This makes the ozone layer thinner and more UV rays reach Earth.
Q35. Alternative energy sources are important because:
Alternative sources like solar and wind energy do not pollute the air. They will never run out like fossil fuels.
Q36. Ocean temperature is rising due to:
As the Earth warms up, the oceans also absorb heat. This causes the ocean temperature to rise, affecting marine life.
Q37. The rise in sea level can cause:
When sea levels rise, water moves inland and covers coastal areas. This can force people to leave their homes.
Q38. Which of these is NOT a greenhouse gas?
Oxygen is not a greenhouse gas. It is the gas that we breathe and does not trap heat in the atmosphere.
Q39. Hydroelectric power is produced using:
Hydroelectric power uses the energy of flowing or falling water. Dams are built to capture this energy and make electricity.
Q40. The ozone layer is important because it:
The ozone layer protects all life on Earth from harmful UV rays. Without it, life would be very difficult.
Q41. We can save the environment by:
Cloth bags are reusable and do not harm the environment. They reduce plastic pollution and save animals.
Q42. Wind energy is produced by:
Wind energy is generated when moving air turns large windmills. These windmills convert wind energy into electricity.
Q43. Planting trees helps reduce global warming because trees:
Trees take in carbon dioxide from the air for photosynthesis. This helps reduce the amount of this greenhouse gas.
Q44. If the ozone layer disappears, life on Earth would be:
Without the ozone layer, harmful UV rays would reach the Earth. This would cause more diseases and harm plants and animals.
Q45. An example of a clean energy source is:
Solar power does not produce any pollution. It is a clean and renewable source of energy.
Q46. A greenhouse gas that comes from cows is:
Cows release methane gas when they digest food. Methane is a strong greenhouse gas that contributes to global warming.
Q47. We can help reduce global warming by:
Walking and cycling do not burn fossil fuels. This reduces the amount of carbon dioxide released into the air.
Q48. The warming of the Earth’s atmosphere due to human activities is called:
Anthropogenic means caused by humans. This warming is caused by human activities like burning fossil fuels.
Q49. Alternative energy sources are also called:
Alternative sources like sun, wind and water are renewable. They are also called clean energy because they do not pollute.
Q50. To stop ozone depletion, countries have:
Many countries agreed to stop using CFCs through an international treaty. This is helping the ozone layer recover.
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Q51. The process of growing more trees to reduce global warming is called:
Afforestation means planting more trees in an area. This helps absorb carbon dioxide and reduce global warming.
Q52. The energy that comes from underground heat is called:
Geothermal energy is heat from deep inside the Earth. It can be used to generate electricity and heat buildings.
Q53. UV rays from the sun can cause:
UV rays damage the skin and can cause sunburn. Over time, they can also cause serious diseases like skin cancer.
Q54. Which of these activities increases global warming?
Factories burn coal and oil which release carbon dioxide. This extra greenhouse gas increases global warming.
Q55. A simple way to save energy at home is to:
LED bulbs use less electricity than regular bulbs. This saves energy and reduces the burning of fossil fuels.
Q56. The protection of the environment is called:
Environmental conservation means protecting and preserving nature. It includes saving forests, animals and keeping the air and water clean.
Q57. A natural disaster that can be worsened by global warming is:
Global warming causes more extreme weather events. Warmer oceans lead to stronger cyclones and heavier floods.
Q58. The burning of forests releases large amounts of:
When forests burn, the carbon stored in trees is released as carbon dioxide. This adds to the greenhouse effect and global warming.
Q59. The best way to dispose of waste without harming the environment is:
Composting turns organic waste into useful manure. Recycling saves resources and reduces pollution.
Q60. The future of energy should be based on:
Renewable sources like solar, wind and hydro power are the future. They are clean, unlimited and do not harm the Earth.