Ecosystem Test ...

Arrange the following ecosystems in increasing order of their mean NPP(tons/ha/year).
A. Tropics deciduous forest
B. Temperature coniferous forest
C. Tropical rainforest
D. Temperate deciduous forest.

An exotic species that is introduced to a new area, spreads rapidly and eliminates native species is called 

Which of the following statements describe natural extinction?
(i) Extinctions abetted by human activities
(ii) Slow replacement of existing species
(iii) Also known as background extinction 
(iv) A small population is most likely to be extinct 

Character of a stable community is that it

Which one of the following exhibits least productivity?

Given figure represents a pyramid of biomass in an aquatic ecosystem. Identify A and B and select the correct answer.
(i) A is the crop which supports and B is the crop which is supported.
(ii) A is the crop which is supported and B is the crop which supports.
(iii) A is phytoplanktons and B is zooplanktons.
(iv) A is zooplanktons and B is phytoplanktons.

Match column I with column II and select the correct option from the given codes.

Which one of the following statements is correct for secondary succession?

In a grassland ecosystem, if the number of primary producers(plants) is approximately $$6$$ million, the number of top carnivores, which may be supported by them will be.

The rate of secondary succession is faster than primary succession because.