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प्रश्न
Explain the following terms.
Colloids
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उत्तर
Colloids: Colloids are extremely tiny particles which are so small that they can not be seen by optical microscope ‘ and remain suspended indefinitely in water. They have the property of being electrically charged and can attract and hold ions of calcium, magnesium and potassium, known as bases. These bases are required by plants for their growth. – Soil colloids are also useful in holding water in the soil. When present in large quantities, they make the soil sticky and tough so that it is difficult to cultivate.
संबंधित प्रश्न
People have used various farming methods to increase food production. However, in the process, they have stripped the soil of nutrients, leading to its degradation.
Can you suggest some ways by which we can reduce soil degradation?
Give a technical term for the following:
Disintegration or decomposition of rock.
What is weathering? Illustrate the process graphically.
Rewrite the following sentence, choosing the right word from the options given below:
_______refers to the gradual disintegration and decomposition of rocks which lie exposed to the elements of weather.
Describe how changes of temperature lead to weathering.
OR
How do changing temperature lead to weathering?
Describe the work of plants as agents of weathering.
Give reasons for the following :
A soil dominated by clay makes tilling difficult.
Give reasons for the following :
Grassland soils are less acidic than forest soils.
Give a geographical reason:
Effect of mass movement will be greater along the western slope of the Sahyadri's than the eastern slope.
Consider the given statement and choose the right option given below.
- Small streams that join the main river is tributary.
- River Gangas is a tributary.
Which of the above statement is/are the right statement.
