SEBA Class 9 Science Important Chapter 14 Natural Resources

SEBA Class 9 Science Important Chapter 14 Natural Resources Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 9 General Science Additional Solutions and select need one. NCERT Important Solutions For Class 9 General Science Download PDF. Important Notes for Class 9 Science.

SEBA Class 9 Science Important Chapter 14 Natural Resources

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 9 Science Additional Question Answer are part of All Subject Solutions. Here we have given CBSE Class 9 Science Important Notes for All Chapters, You can practice these here.

Natural Resources

Chapter: 14

IMPORTANT QUESTION ANSWER

Answer the Following Question:

1. How does the atmosphere act as a blanket?

Ans: The atmosphere regulates Earth’s temperature by preventing sudden heat loss during the night and controlling daytime temperature rise.

2. What causes winds?

Ans: Winds are caused by the uneven heating of Earth’s surface, creating areas of low pressure, with air moving from high-pressure to low-pressure areas.

3. What are the three main components of the biosphere?

Ans: The three main components are the lithosphere (land), hydrosphere (water), and atmosphere (air).

4. What is the importance of water for organisms?

Ans: Water is essential for biochemical reactions, nutrient transport, and temperature regulation in living organisms.

5. How is soil formed?

Ans: Soil is formed by the breakdown of rocks through physical, chemical, and biological processes like weathering and erosion.

6. What is the water cycle?

Ans: The water cycle involves the movement of water from the Earth’s surface to the atmosphere and back, through processes like evaporation, condensation, and precipitation.

7. What is the role of the ozone layer?

Ans: The ozone layer absorbs harmful ultraviolet radiation from the Sun, protecting life on Earth from its damaging effects.

8. Why is the atmosphere essential for life?

Ans: The atmosphere is essential for life because it provides oxygen for respiration, carbon dioxide for photosynthesis, and regulates the Earth’s temperature, protecting life from extreme temperature variations. It also protects from harmful UV radiation from the Sun, making Earth habitable.

9. What causes the movement of air?

Ans: The movement of air, or winds, is caused by uneven heating of the Earth’s surface. Air heated by the land rises, creating areas of low pressure, and the cooler air from surrounding regions moves in to fill the gap, creating wind. This process is driven by the convection currents in the atmosphere.

10. How are clouds formed?

Ans: Clouds form when water vapour in the atmosphere cools down and condenses into tiny droplets around dust particles. As the air cools, the water vapour condenses into liquid form, forming visible clouds. The process of condensation is crucial in the water cycle, eventually leading to rainfall.

11. What is the water cycle and its importance?

Ans: The water cycle describes the continuous movement of water through evaporation, condensation, and precipitation. It plays a vital role in maintaining the balance of water on Earth, ensuring that water circulates through the atmosphere, bodies of water, and underground reservoirs, supporting life.

12. How does soil erosion occur, and why is it harmful?

Ans: Soil erosion occurs when wind or water removes the topsoil, which is rich in nutrients. It is harmful because it reduces soil fertility, making it difficult for plants to grow, and it leads to the loss of valuable agricultural land.

13. Explain the nitrogen cycle and its importance.

Ans: The nitrogen cycle involves the conversion of atmospheric nitrogen into usable forms like nitrates and nitrites through the action of nitrogen-fixing bacteria. This nitrogen is then absorbed by plants, consumed by animals, and eventually returned to the atmosphere. It is essential for the synthesis of proteins and nucleic acids in organisms.

14. How does deforestation lead to soil erosion?

Ans: Deforestation removes vegetation that holds the soil together with its roots. Without plant cover, the soil becomes loose and is more easily carried away by wind or water, leading to increased soil erosion, loss of nutrients, and degradation of land.

15. What is the greenhouse effect, and how does it contribute to global warming?

Ans: The greenhouse effect occurs when gases like carbon dioxide and methane trap heat in Earth’s atmosphere. These gases allow sunlight to enter but prevent heat from escaping, leading to an increase in global temperatures. The enhanced greenhouse effect, due to increased human activities, is a major cause of global warming.