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SAI INTERNATIONAL SCHOOL
Subject – Chemistry

Class – VII
Topic - SOIL - A Natural Resource
Sub-topic - Concept Mapping

Home Assignment

Concept - Formation of Soil, Composition of Soil

Q1. What is weathering? 1

Q2 What are the agents involved in weathering? 1

Q3 Why is the presence of humus important to the soil? 1

Q4 What is humus? 1

Q5 Presence of air and water in the soil is important. Explain. 1

Concept – Soil profile, Types of Soil

Q1. What is soil profile? 1

Q2 Name the three major layers of soil. 1

Q3 How can soil be classified depending on the size of its particles? 1

Q4 Why is loamy soil best for farming and gardening? 1

Q5 Which type of soil is used for pottery? 1

Concept – Properties of Soil, Organisms in Soil, Soil and Crops

Q1. What is percolation rate? 1

Q2 What type of soil has the tendency of getting water logged? 1

Q3 Arrange the three types of soils in the decreasing order of their water- 1
holding capacity.

Q4 How do microbes and bacteria living in the soil help? 1

Q5 How can we predict what crops can be grown in a particular area? 1

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