Soil

Q.

Is soil living or non living.

Q. soil is the best kind of soil for the cultivation of crops.

1. Sandy
2. Loamy
3. Clayey

Q.

In soil, water available to plant roots is

1. Hygroscopic water

2. Capillary water

3. Gravitation water

4. Colloid water

Q.

Dead and decayed residue of plants and animals is called.

1. Clay

2. Silt

3. Humus

4. Sand

Q. Which of the following deals with the study of soil?

1. None of these
2. Pedology
3. Pedagogy
4. Physiology

Q. Which of the following organisms is called as farmer's friend?

1. Millipedes
2. Centipedes
3. Earthworms
4. Snails

Q.

Question 8

Unscramble the following jumbled words related to soil.

Q.

Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons.

Q. Why top soil has most of humus ?

Q.

Plastic bags are considered bad for soil because:

1. They pollute the soil.

2. They change the colour of the soil.

3. They make soil particles too thick.

4. They make soil particles too rough.

Q.

Question 1
Tick the most suitable answer.
In addition to the rock particles, the soil contains ___.
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air, and plants

Q.

Question 5

Soil has particles of different sizes. Arrange the words given below in increasing order of their particle size.
$\begin{array}{c}Rock,Clay,Sand,Gravel,Silt\end{array}$

Q. What do you understand by soil permeability? Explain with a diagram. [2 MARKS]

Q.

Which of the following factors directly affect the soil of a particular place or region?

1. Wind and rainfall

2. Temperature and light

3. Humidity

4. All of these

Q.

The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients.

1. Desert

2. Forest

3. Park

4. Cricket ground

Q. Which of the following components of soil is rich in nutrients and makes the soil fertile?

1. 
   Water
2. 
   Sand
3. 
   Rock
4. 
   Humus

Q.

Which type of soil is best known for growing plants and why? [3 MARKS]

Q.

Explain how animals dwelling in the forest help it grow and regenerate.

Q.

As we keep digging through the different layers of soil, we will reach a point where the surface becomes hard to dig. Which layer of soil is this?

1. Horizon A

2. Bedrock

3. Horizon C

4. Horizon B

Q. Explain how animals dwelling in the forest help it grow and regenerate.

Q. Describe the components that make up the soil.

Q. Waste products and chemicals should be treated before releasing them into the soil.

1. True
2. False

Q. a) What is meant by the percolation rate of soil? [1 mark]
b) In which type of soil is the percolation rate the highest and the lowest? [1 mark]
c) Calculate the rate of percolation (in mL/min) of the soil sample if 500 mL of water passes through it in 25 min. [1 mark]

Q.

The part of the earth which is made up of land and hard crust beneath it is known as

1. Lithosphere
2. 
   

   Troposphere

3. 
   

   stratosphere

4. None of the above

Q. What is the top layer of the soil called?

1. Humus
2. Sandy soil
3. Subsoil
4. Topsoil

Q. Why are plastic bags, pesticides and other chemicals considered bad for soil?

1. They change the texture of the soil.
2. They reduce the fertility of the soil.
3. Soil loses all its moisture.
4. Soil becomes rich in organic components.

Q. The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients.

1. Desert
2. Forest
3. Open field
4. Cricket ground

Q. Sketch the cross section of soil and label the various layers.

Q. The burrows made by the organisms in the soil affects the condition of the soil and also prevents soil erosion.

1. 
   True
2. 
   False

Q. Topsoil is the habitat for many living organisms.

1. True
2. False