Botany Ecosystem questions from NEET UG 2012.
The rate of formation of new organic matter by rabbit in a grassland, is called
The upright pyramid of number is absent in
Identify the likely organisms (I, II) (III) and (IV) in the food web shown below  
Which one of the following is not a functional unit of an ecosystem?
The second stage of hydrosere is occupied by plants like
Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels? 
Which one of the following is not a gaseous biogeochemical cycle in ecosystem?
Identify the possible link A in the following food chain Green plant $\rightarrow$ Insect $\rightarrow$ Frog $\rightarrow$ A $\rightarrow$ Eagle