Why do we call the earthworm as the farmer’s friend?

1.	It eats the pests.
2.	It prevents the growth of weeds.
3.	It makes the soil fertile by burrowing.
4.	It helps in the breakdown of complex organic matter as well as in loosening of the soil.

Which of the following is not a step in the process of decomposition?

1. Fragmentation

2. Leaching

3. Anabolism

4. Humification.

Which of the following statement is correct?

1. Dead plant and animals remains, including fecal matter, constitute detritus,

2. Detritus is the product of decomposition.

3. Breakdown of complex inorganic matter into organic substances like CO₂ and nutrients is called as decomposition.

4. Decomposition is a single step process.

What is the process by which Detritivores break down the detritus into smaller particles.?

1. Degradation

2. Decomposition

3. Fragmentation

4. Leaching

What does the process of leaching refers to-

In the process of decomposition ‘catabolism’ is performed by-

1. Earthworms

2. Bacteria

3. Bacteria and fungi

4. Fungi

Which of the following statement is incorrect?

Which of the following is the substrate in the process of mineralisation?

1. Detritus

2. Humus

3. Organic matter

4. None of the above

Which of the following does not affect rate of decomposition?

1. Substrate composition

2. Soil moisture

3. Temperature of soil

4. CO₂

Decomposition would be fast if the detritus contains-

1. Cellulose

2. Lignin and chitin

3. Nitrogen and water soluble sugars

4. Cellulose and pectin