Primary productivity of an terrestrial ecosystem depends upon

1. Photosynthetic capacity of plants.

2. A variety of environmental factors,

3. Availability of nutrients

4. All of the above.

What is the annual net primary productivity of the whole biosphere

1. 160 billion tons

2. 170 billion tons

3. 177 billion tons

4. 190 billion tons

Which of the following contributes the maximum to the net primary productivity?

1. Ocean ecosystem

2. Land ecosystem

3. Pond ecosystem

4. Man-made ecosystem

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

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?