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What is Soil? Video Lecture | Science Olympiad Class 7
FAQs on What is Soil? Video Lecture - Science Olympiad Class 7
| 1. What is soil made of? |  |
Ans.Soil is made up of a mixture of minerals, organic matter, water, and air. The minerals come from rocks that have weathered over time, while organic matter consists of decomposed plants and animals. Water and air are also essential components that help support life in the soil.
| 2. Why is soil important for plants? | |
Ans.Soil is important for plants because it provides them with essential nutrients, water, and a place to anchor their roots. Nutrients found in the soil, such as nitrogen, phosphorus, and potassium, are crucial for plant growth and development.
| 3. How do different types of soil affect plant growth? | |
Ans.Different types of soil, such as sandy, clay, and loamy soil, have different properties that affect plant growth. Sandy soil drains quickly but may not hold nutrients well, while clay soil retains water but can become compacted. Loamy soil is considered the best for plant growth as it retains moisture and nutrients while allowing for good drainage.
| 4. What are the layers of soil called? | |
Ans.The layers of soil are called soil horizons. There are typically four main layers: the top layer (O horizon) rich in organic matter, the topsoil (A horizon) where most plant roots grow, the subsoil (B horizon) that contains minerals leached from above, and the bedrock (C horizon) which is the original rock material.
| 5. How can we protect and preserve soil? | |
Ans.We can protect and preserve soil by practicing sustainable farming, reducing the use of chemicals, planting cover crops, and avoiding overgrazing. It is also important to prevent soil erosion by planting trees and maintaining healthy vegetation to keep the soil intact.
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