Looking for accurate SEBA Class 9 Science Chapter 14 (Natural Resources) textual solutions for the 2026–27 academic year? Access complete step-by-step textbook exercise answers covering air and water pollution, soil formation, the water cycle, nitrogen cycle, carbon cycle, oxygen cycle, greenhouse effect, and ozone layer depletion to score top marks in your annual exams.
Blue question
1. How is our atmosphere different from the atmospheres on Venus and Mars?
Ans.
Earth’s atmosphere has a balanced mixture of gases like nitrogen, oxygen, and small amounts of carbon dioxide which support life.
Venus and Mars have atmospheres mainly made of carbon dioxide and lack enough oxygen, so they cannot support life like Earth.
2. How does the atmosphere act as a blanket?
Ans.
The atmosphere keeps the Earth warm by trapping some heat and stopping sudden temperature changes between day and night. This helps maintain a stable temperature for life.
3. What causes winds?
Ans.
Winds are caused by the movement of air from high-pressure areas to low-pressure areas. Uneven heating of land and water creates these pressure differences.
4. How are clouds formed?
Ans.
Clouds form when warm, moist air rises, cools down, and water vapour condenses into tiny water droplets or ice crystals.
5. List any three human activities that you think would lead to air pollution.
Ans.
- Burning of fossil fuels (cars, factories).
- Cutting down forests.
- Burning garbage and crop residues.
SEBA Class 9 Science Chapter 14 Solutions
6. Why do organisms need water?
Ans.
Organisms need water for digestion, transport of nutrients, removal of wastes, temperature control, and many chemical reactions in the body.
7. What is the major source of fresh water in your city/town/village?
Ans.
Possible sources: river, lake, groundwater (wells/hand pumps), or municipal water supply.
(You can replace with your local source.)
8. Do you know of any activity which may be polluting this water source?
Ans.
Yes. Activities such as dumping household waste, releasing factory waste, washing clothes or vehicles near the water source, and using chemical fertilizers can pollute it.
9. How is soil formed?
Ans.
Soil is formed by the breaking down of rocks into small particles over thousands of years due to wind, water, heat, and living organisms.
10. What is soil erosion?
Ans.
Soil erosion is the removal of the top fertile layer of soil by wind, water, or human activities.
Class 9 Science Chapter 14 Question Answer SEBA 2026-27
11. What are the methods of preventing or reducing soil erosion?
Ans.
- Planting more trees (afforestation).
- Contour ploughing and terrace farming.
- Using grass cover to hold the soil.
12. What are the different states in which water is found during the water cycle?
Ans.
Water is found in three states:
- Solid (ice)
- Liquid (water)
- Gas (water vapour)
13. Name two biologically important compounds that contain both oxygen and nitrogen.
Ans.
- Proteins
- Nucleic acids (DNA/RNA)
14. List any three human activities which would lead to an increase in the carbon dioxide content of air.
Ans.
- Burning of fuels in vehicles and industries.
- Deforestation.
- Burning wood or waste.
15. What is the greenhouse effect?
Ans.
The greenhouse effect is the warming of Earth due to gases like carbon dioxide and methane trapping heat in the atmosphere. This keeps Earth warm enough for life.
Natural Resources Class 9 SEBA Textual Exercise Solutions
16. What are the two forms of oxygen found in the atmosphere?
Ans.
Dioxygen (O2) – the oxygen we breathe.
Ozone (O3) – found in the ozone layer.
Textbook exercise
1. Why is the atmosphere essential for life?
Ans.
The atmosphere is essential because it provides us with oxygen to breathe and protects us from harmful sun rays. It keeps the Earth warm and maintains a suitable temperature for life. It also helps in the water cycle and supports weather and climate.
2. Why is water essential for life?
Ans.
Water is needed for all life processes. It helps in digestion, transport of nutrients, removal of wastes, controlling body temperature, and chemical reactions inside the body. Without water, no organism can survive.
3. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
Ans.
Living organisms depend on soil because it provides nutrients to plants. Plants grow in soil and form the base of the food chain. Soil also supports many animals, microorganisms, and insects.
Aquatic organisms are not completely independent of soil. Soil particles carry nutrients into water bodies, plants grow in underwater soil, and many aquatic animals depend on these plants for food and shelter.
SEBA Class 9 Science Chapter 14 Textbook Answers
4. You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
Ans.
Weather is predicted using weather instruments and satellites. They collect information about temperature, wind speed, humidity, air pressure, and clouds. Computers then analyze this data to forecast the weather.
5. We know that many human activities lead to increasing pollution of air, water, and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
Ans.
Isolating polluting activities in specific areas can reduce pollution in other places, but it will not completely solve the problem. Pollution can spread through air and water. The best solution is to reduce pollution at the source by using cleaner methods, proper waste management, and planting more trees.
6. Write a note on how forests influence the quality of our air, soil and water resources.
Ans.
Forests improve the quality of air by absorbing carbon dioxide and releasing oxygen. The roots of trees hold the soil firmly and prevent soil erosion. Forests also help in maintaining the water cycle by storing water, increasing rainfall, and reducing floods. They filter water and keep rivers and groundwater clean.
Class 9 Science Natural Resources Notes
🔬 Updated Solutions Notice:
This page features complete, step-by-step SEBA Class 9 Science Chapter 14 (Natural Resources) Textual Exercise Solutions updated for the 2026–27 academic session. All textbook answers, biogeochemical cycle explanations, and environmental science concepts strictly follow the latest revised Assam Board (SEBA) curriculum.
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