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

Which of the following promotes the process of decomposition?

1. Warm and moist environment

2. low temperature

3. Anaerobiosis

4. Lignin and chitin-rich detritus

What is the source of energy for all ecosystems on Earth, except for the deep sea hydro-thermal ecosystem?

1. Sun

2. Hydrothermal vents

3. Lava

4. Water

What percentage of the incident solar radiation is photosynthetically active radiation (PAR)?

1. 50%

2. Less than 50%

3. More than 50%

4.10%

What proportion of the PAR (photosynthetically active radiation) is captured by plants?

1. 1 - 10%

2. 2 - 10%

3. 5 - 15%

4. 5 - 25%

Which of the following statement is incorrect?

Which are the primary consumers in a grazing food chain?

1. Carnivores

2. Herbivores

3. Detrivores

4. Omnivores

What do secondary carnivores refer to?

1. Animals at second trophic level

2. Those animals that depend on the herbivores for food

3. Those animals that depend on the primary carnivores for food

4. Those animals that depend on the secondary herbivores for food

The detritus food chain (DFC) begins with _________. It is made up of decomposers which are _________ organisms, mainly _________. They meet their energy and nutrient requirements by degrading _________.