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Solved NCERT Questions For Class 9 Science Chapter 14 In Hindi - Free PDF
NCERT Solutions For Class 9 Science Chapter 14 Natural Resources in Hindi - 2025-26
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FAQs on NCERT Solutions For Class 9 Science Chapter 14 Natural Resources in Hindi - 2025-26
1. Where can I find accurate and step-by-step NCERT Solutions for Class 9 Science Chapter 14 for the 2025-26 session?
You can find reliable and comprehensive NCERT Solutions for Class 9 Science Chapter 14, Natural Resources, right here on Vedantu. Our solutions are prepared by subject matter experts and are fully aligned with the latest CBSE 2025-26 syllabus. Each answer provides the correct, step-by-step methodology required to score well in exams.
2. What key topics are covered in the NCERT Solutions for Class 9 Science Chapter 14?
The NCERT Solutions for this chapter provide detailed answers for all questions related to the core concepts of Natural Resources. The main topics covered are:
- The atmosphere's role and the causes of wind (The Breath of Life: Air).
- Air pollution, its causes, and effects like acid rain.
- The importance of water and the process of rain formation (Water: A Wonder Liquid).
- The causes and impact of water pollution.
- Soil formation, composition, and soil erosion (Mineral Riches in the Soil).
- Biogeochemical cycles, including the water cycle, nitrogen cycle, carbon cycle, and oxygen cycle.
3. How are living organisms dependent on soil, and are aquatic organisms completely independent of it?
Living organisms are directly or indirectly dependent on soil. Plants anchor themselves in soil and absorb water and minerals for photosynthesis. Herbivores depend on these plants for food, and carnivores depend on herbivores. Thus, soil is the foundation of most terrestrial ecosystems. Aquatic organisms are not completely independent of soil. Minerals from the soil on land are washed into water bodies, providing nutrients for aquatic plants and algae. Furthermore, the soil at the bottom of water bodies is home to decomposers that break down dead organic matter, recycling nutrients within the aquatic ecosystem.
4. According to the NCERT textbook, what is the step-by-step process used to predict the weather?
The process of weather prediction involves several steps carried out by meteorologists. The correct method is as follows:
- Data Collection: Meteorologists use various instruments to collect data on atmospheric conditions. This includes measuring temperature (thermometer), air pressure (barometer), humidity (hygrometer), wind speed (anemometer), and rainfall (rain gauge).
- Data Analysis: The collected data from different locations is compiled and analysed using computer models.
- Pattern Identification: Experts study these patterns, like the formation of low-pressure or high-pressure areas, to understand how the weather might change.
- Forecasting: Based on this analysis, they create weather forecasts that predict future temperature, precipitation, and wind conditions.
5. How does the process of soil formation depend on both climatic factors and living organisms?
Soil formation, or pedogenesis, is a slow process that depends on both climatic factors and living organisms. The correct step-by-step explanation is:
- Climatic Factors (Weathering): The sun heats rocks during the day, causing them to expand. At night, they cool and contract, leading to cracks. Water enters these cracks and can freeze, widening the cracks. Wind and flowing water also cause abrasion, breaking down large rocks into smaller particles.
- Living Organisms (Biological Role): Lichens often grow on rock surfaces and release chemicals that further break down the rock. As soil begins to form, mosses grow and their roots penetrate deeper. The roots of larger plants continue this process. Finally, microorganisms like bacteria and fungi decompose dead plants and animals, adding rich organic matter called humus to the soil, which makes it fertile.
6. What is the fundamental difference between the natural greenhouse effect and global warming, as explained in Chapter 14?
It is a common misconception to use these terms interchangeably. The NCERT solutions help clarify the difference: The greenhouse effect is a vital, natural phenomenon where certain atmospheric gases (like CO2, methane) trap heat from the sun, preventing it from escaping into space. This keeps the Earth's average temperature stable and warm enough to support life. In contrast, global warming refers to the unnatural and rapid increase in Earth's average temperature caused by the enhancement of the greenhouse effect due to excessive pollutants, primarily from burning fossil fuels.
7. Why is the nitrogen cycle often considered more complex than the water cycle? Explain the key steps involved in nitrogen fixation.
The nitrogen cycle is more complex because, unlike water which mainly changes its physical state (solid, liquid, gas), nitrogen must undergo several chemical transformations to become usable by living organisms. The abundant nitrogen gas (N₂) in the atmosphere is inert. The crucial process of nitrogen fixation converts it into usable forms like ammonia and nitrates. The main steps are:
- Atmospheric Fixation: The high energy of lightning breaks nitrogen molecules, allowing them to combine with oxygen and fall to Earth as nitrates.
- Biological Fixation: This is the most significant method. Specialised bacteria, such as Rhizobium living in the root nodules of leguminous plants (like peas and beans), convert atmospheric nitrogen into ammonia.
8. How is acid rain formed, and what are its major harmful effects on natural resources?
Acid rain is a direct consequence of air pollution. The correct explanation of its formation is that burning fossil fuels (like coal and petroleum) releases gases such as sulphur dioxide (SO₂) and nitrogen oxides (NOx) into the atmosphere. These gases react with water vapour to form sulphuric acid (H₂SO₄) and nitric acid (HNO₃). This acidic water then falls to the Earth as acid rain. Its major harmful effects include:
- Increasing the acidity of soil, damaging forests and crops.
- Making lakes and rivers acidic, which is fatal to fish and other aquatic life.
- Corroding buildings, monuments, and statues made of stone and metal.
9. Do Vedantu’s NCERT Solutions for Class 9 Science Chapter 14 cover all the questions from the textbook exercises?
Yes, absolutely. The NCERT Solutions provided by Vedantu are exhaustive and cover 100% of the questions present in the Class 9 Science textbook for Chapter 14, 'Natural Resources'. This includes all the in-text questions found between the sections as well as every question from the end-of-chapter exercises. The solutions ensure a thorough preparation as per the CBSE curriculum.
