Which of the following pyramids can never be inverted in a natural ecosystem?

1. pyramid of numbers

2. pyramid of energy

3. pyramid of biomass

4. all can be inverted 

In general, the biomass in an ecosystem will be greatest at the trophic level comprising.

1. secondary consumers

2. primary consumers

3. producers

4. tertiary consumers

The limitations of ecological pyramids include all the following except:

1. The do not take into account the same species belonging to two or more trophic levels

2. They do not represent relationships between organisms at different trophic levels

3. They assume a simple food chain and do not consider food webs

4. Saprotrophs are not given any place in the ecological pyramids

Given below is an imaginary pyramid of numbers. What could be one of the possibilities

about certain organisms at some of the different levels?

1. Level PC is insects and level SC is small insectivorous birds.

2. Level PP is phytoplanktons in sea and whale on top level TC

3. level one PP is pipal trees and the level SC is sheep

4. Level PC is rats and level SC is cats 

The upright pyramid of number is absent in

1. pond                           

2. forest

3. lake                           

4. grassland

Which one of the following statements for pyramid of energy is incorrect, whereas the

remaining three are correct ?

1. It shows energy content of different trophic level organisms

2. It is inverted in shape

3. It is upright in shape

4. Its base is broad

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

1. Detritus

2. Humus

3. Standing state 

4. Standing crop

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

1. Dry weight

2. Number of individuals

3. Rate of energy flow

4. Fresh weight

The given type of ecological pyramid represents

1. pyramid of numbers in tree ecosystem

2. pyramid of biomass in a fallow land 

3. pyramid of biomass in a lake

4. energy pyramid in a spring

The given figure best represents:

(1) Pyramid of number in parasitic food chain

(2) Pyramid of biomass in forest ecosystem

(3) Pyramid of number in grassland ecosystem

(4) Pyramid of number in forest ecosystem