During decomposition of detritus, the step that is performed by bacteria and fungi includes:
1. Catabolism only
2. Catabolism and fragmentation
3. Leaching and catabolism
4. Fragmentation, Leaching and Catabolism

The three steps of decomposition occur:
1. sequentially, with catabolism being the last step.
2. sequentially, with leaching being the last step.
3. simultaneously.
4. sequentially, but not in a particular order.

Humus:
1. Is easily broken down by microbes
2. Undergoes decomposition rapidly
3. Serves as a reservoir of nutrients
4. Yields organic nutrients on mineralization

Decomposition of detritus is rapid when:
1. It is rich in lignin and chitin
2. Ambient temperature is low
3. Environment favours anaerobiosis
4. It predominantly contains nitrogen and sugars

What percentage of photosynthetic active radiation is captured by plants?

Primary carnivores are, most aptly, characterized as:

The detritus food chain:

1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

In a terrestrial ecosystem, a much larger fraction of energy flows through the:

In an aquatic food chain, zooplankton occupy which trophic level?

Organisms at each trophic level depend on those at the lower level trophic level for their energy demands except: