NCERT Solutions For Class 7 Science Chapter 9 Soil in Hindi - 2025-26
FAQs on NCERT Solutions For Class 7 Science Chapter 9 Soil in Hindi - 2025-26
1. How can I find the correct step-by-step answers for all the exercises in NCERT Class 7 Science Chapter 9?
The NCERT Solutions for Class 7 Science Chapter 9 provide detailed, step-by-step methods for solving every question in the textbook. These solutions are prepared by subject experts to align with the CBSE 2025-26 curriculum, ensuring you understand the correct methodology for arriving at the final answer.
2. What are the main topics covered in the NCERT Solutions for Class 7 Science Chapter 9, Soil?
The solutions for this chapter cover all key concepts from the NCERT textbook, including:
- The process of soil formation through weathering.
- Different layers of the soil profile (A, B, C horizons).
- Properties and types of soil like sandy, clayey, and loamy.
- Calculating soil properties such as percolation rate and moisture absorption.
- The relationship between different soil types and the crops they support.
- Causes and prevention of soil erosion.
3. How do you solve the numerical problem for calculating the percolation rate of soil as given in Chapter 9?
To solve for the percolation rate as per the NCERT method, you must follow a clear procedure:
- First, note the amount of water used, usually in millilitres (mL).
- Next, measure the time taken for all the water to seep into the soil, measured in minutes (min).
- Finally, apply the formula: Percolation Rate (mL/min) = Amount of water (mL) / Percolation time (min).
4. According to the NCERT solutions, how are different types of soil useful for growing specific crops?
The NCERT chapter explains that the suitability of soil for crops depends on its properties. For example:
- Clayey soil is rich in humus and has excellent water-holding capacity, making it ideal for growing crops like paddy (rice) and wheat.
- Loamy soil offers a good balance of drainage and water retention, suitable for growing lentils (masoor), other pulses, and cotton.
- Sandy soil, with its large particles and poor water retention, is suitable for crops that require less water, such as millets.
5. Why is it important to draw and label the soil profile diagram correctly as shown in the NCERT solutions?
Following the method in the NCERT solutions for drawing the soil profile is crucial because it ensures you earn full marks in exams. A correct diagram must clearly show and label each distinct layer, or horizon:
- A-horizon (Topsoil): Dark, rich in humus and minerals.
- B-horizon (Subsoil): Lighter in colour, with less humus.
- C-horizon: Made of small lumps of rocks with cracks.
- Bedrock: The hard, unweathered rock layer at the bottom.
6. What is the key difference between clayey and sandy soil, and why is this critical for solving NCERT questions about water retention?
The primary difference lies in the particle size. Sandy soil has large particles with big air gaps, allowing water to drain quickly (high percolation). Clayey soil has very fine, tightly packed particles, leading to slow drainage and high water retention. This is critical for solving problems because questions on crop suitability or irrigation needs depend directly on understanding this property. A high water retention capacity (clayey) is good for thirsty crops, while low retention (sandy) is not.
7. How does the process of weathering, explained in Chapter 9, directly impact the solutions to problems about soil types?
Weathering is the breakdown of rocks into small particles, which forms soil. The nature of this process directly determines the soil's properties, which is the basis for solving many NCERT questions. For instance, extensive physical weathering might lead to larger particles, forming sandy soil. Chemical weathering and biological activity contribute to finer particles and humus, creating clayey or loamy soils. Understanding this cause-and-effect helps in explaining why a particular region has a certain soil type in your answers.
8. Why is humus considered a crucial component when answering questions about soil fertility in the Class 7 NCERT exercises?
Humus is the decaying organic matter in topsoil. It is crucial for answers on soil fertility because it directly provides nutrients to plants and improves the soil's structure and water-holding capacity. When a question asks why topsoil is so fertile, mentioning that it is rich in humus is a key point for a complete answer. Simply stating it has 'minerals' is not enough; humus is the specific component that makes soil dark, porous, and fertile.
9. Besides water and wind, what other factors contribute to soil erosion, and how should an answer on its prevention be structured for full marks?
While water and wind are primary agents, the NCERT chapter also implies other factors like deforestation (removal of trees that bind soil) and overgrazing. To structure an answer for full marks on prevention, you should link the cause to a specific solution, as shown in the NCERT solutions. For example:
- Problem: Deforestation. Solution: Afforestation (planting more trees).
- Problem: Overgrazing. Solution: Managing grazing lands.
- Problem: Runoff on slopes. Solution: Constructing bunds or practising terrace farming.











