i. In addition to the rock particles, the soil contains minerals, organic matter, air and water.
ii. The water holding capacity is the highest in clayey soil.
iii. In desert soil erosion occurs through wind.
iv. Sandy soil can hold very little water.
v. Soil is of different types: clayey, loamy and sandy.
vi. The uppermost horizon is generally dark in colour as it is rich in humus and minerals.
i. Plantation prevents soil erosion. True
ii. Sandy soil is used to make pottery. False
iii. Use of polythene should be banned to avoid soil pollution. True
iv. Soil is important for life on the earth. True
v. Each layer of soil is same in feel (texture), colour, depth and chemical composition. False
vi. The loamy soil also has humus in it. True
Ans. Sandy soil is well aerated.
Ans. Sandy soil has the highest percolation rate.
Ans. Clayey soil has the least percolation rate.
Ans. The rotting dead matter in the soil is called humus.
Ans. The mixture of rock particles and humus is called the soil.
Ans. Polythene bags, plastics, waste products, chemicals and pesticides.
Ans. Topsoil or the A-horizon
Ans. B-horizon or the middle layer
Ans. Clayey soil is used to make pots, toys and statues.
Ans. Clayey soil should be used for making matkas and surahis.
Ans. The uppermost horizon is generally dark in colour as it is rich in humus and minerals.
Ans. The humus makes the soil fertile and provides nutrients to growing plants.
Ans. A vertical section through different layers of the soil is called the soil profile.
Ans. Loamy soil is a mixture of sand, clay and another type of soil particle known as silt.
Ans. Just below the C-horizon is the bedrock, which is hard and difficult to dig with a spade.
Ans. Clayey and loamy soils are both suitable for growing cereals like wheat and gram.
Ans. Erosion of soil is more severe in areas of little or no surface vegetation, such as desert or bare lands.
Ans. For lentils (masoor) and other pulses, loamy soils, which drain water easily, are required.
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