CBSE Class 7 Science Revision Worksheet Set 12

CBSE Class 7 Science - Revision (3)

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INTERNATIONAL INDIAN SCHOOL, RIYADH

SUMMATIVE ASSESSMENT –II 2011-12

STD. - VII

SCIENCE

LN. 9 : SOIL

I. Fill in the blanks :

1. The rotting dead matter in the soil is called __________________.

2. A vertical section through different layers of the soil is called _______________.

3. The mixture of _____________ and humus is called the soil.

4. Percolation rate of water is the highest in the ____________ soil and least in the ___________ soil.

5. The best top soil for growing plants is _____________.

6. The removal of land surface by water, wind or ice is known as __________.

II. Write True or False :

1. If the amount of large and fine particles is about the same, then the soil is called loamy soil.

2. The layer which is hard and difficult to dig with spade is called top soil.

3. Sandy soil is used to make pots, toys and statues.

4. Soil is affected by climatic factors.

5. The soil which is light, well aerated and rather dry is clayey soil.

6. In deserts, soil erosion occurs through wind.

7. Cotton is grown in sandy loam soil.

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