Soil

Q.

Write 10 uses of soil.

Q.

What are the factors responsible for soil formation?

Q.

If soil has all nutrients, why do we need to replenish it?

Q.

Explain the formation of soil?

Q.

What is humus in simple words?

Q.

Organic matter formed due to the death and decay of plants and animals is called as ___ .

Q. What are the advantages of preparing the soil?

1. Soil preparation causes soil erosion.
2. The loosened soil kills earthworms and microbes.
3. It allows the roots to penetrate deep into the soil.
4. It results in loss of humus content in soil.

Q. Soil can be formed by the mixture of powdered rock and .

1. organic matter
2. crystals
3. glass particles

Q.

Which of the following facts is incorrect about weathering?

1. It is a natural phenomenon

2. The process involves chemical decomposition.

3. It involves mechanical disintegration.

4. It does not result in soil formation

Q. A handful of soil is taken from a nearby garden and mix it in a clear glass partially filled with water. After stirring the mixture for sometime it is left undisturbed. What are the observations made after one hour?

1. Different layers of soil are formed.
2. Soil makes a muddy solution.
3. It consist of granules of rocks.
4. Lighter materials float on top and the heavier particles settle at the bottom.

Q.

Which the following is/are the components of soil?

1. Minerals

2. Air

3. Water

4. Silt

Q.

Humus is an organic matter that is mainly constituted of

1. Vegetables

2. Dried Leaves

3. Dead And Decaying Animal Substances

4. All Of These

Q. is rich in humus.

1. Sub soil
2. Top soil
3. Bed rock

Q. How do marine organisms utilize carbon dioxide from the atmosphere?

1. They use carbonates to form shells
2. They help in the formation of limestone rocks
3. They use it for respiration
4. They use it for photosynthesis

Q. The process in which forests are converted into grass land, then into dry land and finally into deserts is known as:

1. soil preparation
2. desertification
3. soil erosion
4. pasteurization

Q.

What is soil preparation? [3 MARKS]

Q.

The major reservoir for phosphorus is

1. the clouds

2. soil and rocks

3. the atmosphere

4. the sun

Q. What is soil preparation?