Ecosystem Test ...

Main objective of production of herbicide resistant GM crops is to

The mean biomass per unit area and the net primary productivity for four ecosystems P, Q, R and S are tabulated.

Ecosystem	Mean biomass per unit area (kg $$m^{-2}$$)	Net primary productivity (g $$m^{-2}yr^{-1}$$)
P	$$1.6$$	$$500$$
Q	$$2.0$$	$$2000$$
R	$$44$$	$$2000$$
S	$$0.67$$	$$71$$

The four ecosystems most likely could be.

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the take Victoria of E. Africa?

The annual net primary productivity of the whole biosphere is approximately.

During the stages of succession in a given ecosystem, the following changes in characteristics may be observed.

	Characteristic	Stages in ecosystem development	Stages in ecosystem development
		Early	Late
A.	Total organic matter	Low	High
B.	Species diversity	Low	High
C.	Size of organism	Small	Large
D.	Productivity	Low	High
E.	Food chains	Short	Long

Which one of the characteristics, A, B, C, D or E is responsible for the apparent high degree of stability associated with a climax ecosystem?

The biomass available for consumption to heterotrophs and the rate of formation of new organic matter by consumers are defined as

Which of the following representations show the pyramid of number in a forest ecosystem?

Which of the given pyramids represents the variation in biomass at different trophic levels in pond ecosystem? 

In an ecological succession, saprophytes belong to 

In a pyramid of numbers representing an ecosystem of a large freshwater pond, the number of primary consumers is