Mass of living matter at a tropic level in an area at any time is called:

1.	Detritus	2.	Humus
3.	Standing state	4.	Standing crop

The biomass available for consumption by the herbivores and the decomposers is called:

1. net primary productivity

2. secondary productivity

3. standing crop

4. gross primary productivity

Which one of the following is one of the characteristics of a biological community?

Which one of the following is not used for the construction of ecological pyramids?

Which of the following ecological pyramids is generally inverted?

1. Pyramid of biomass in a sea

2. Pyramid of numbers in grassland

3. Pyramid of energy

4. Pyramid of biomass in a forest

Which one of the following is not a functional unit of an ecosystem?

1. Energy flow

2. Decomposition

3. Productivity

4. Stratification

Pheretima and its close relatives derive nourishment from:

1. Sugarcane roots

2. Decaying fallen leaves and soil organic matter

3. Soil insects

4. Small pieces of fresh fallen leaves of maize

Secondary productivity is the rate of formation of new organic matter by:

1. Parasite

2. Consumer

3. Decomposer

4. Producer