Which of the following is an ecosystem service provided by a natural ecosystem?
Cycling of nutrients
Prevention of soil erosion
Pollutant absorption and reduction of the threat of global warming
All of the above
Name an organism found as secondary carnivore in an aquatic ecosystem.
In an aquatic ecosystem, food chain can be drawn as follows
Producer (Phytoplankton) $\rightarrow$ Primary consumer (Zooplankton) $\rightarrow$ Secondary consumer (small fish and water beetle) (Ist to carnivore) $\rightarrow$ Tertiary consumer (Ilnd carnivore like large fish, water birds like fowl and duck).
So, the large fish and water birds like ducks and water fowls which are the tertiary consumers in an aquatic ecosystem occupy a position of secondary carnivore.
What does the base tier of the ecological pyramid represent?
The base tier of the ecological pyramids represent the producers or first trophic level in case of three ecological pyramids
(i) Pyramid of number
(ii) Pyramid of biomass
(iii) Pyramid of energy
Under what conditions would a particular stage in the process of succession revert back to an earlier stage?
Natural disturbances like fire, flood or any other natural disaster and anthropogen activities can revert back to an earlier stage of succession.
Arrange the following as observed in vertical stratification of a forest; Grass, Shrubby plants, Teak, Amaranths.
Vertical stratification (dispersion) of species in a forest ecosystem is arranged as grass (floor of forest) $\rightarrow$ Amaranthus $\rightarrow$ Shrubby plants $\rightarrow$ Teak (tree).