The 'Reed-swamp' stage refers to which of the following?
- A$A$ stage formed by an increase in the proportion of free-floating plants in succession.
- B$A$ successional stage showing a mixture of both terrestrial and aquatic conditions.
- C$A$ stage formed when an aquatic habitat is suddenly converted into a terrestrial habitat.
- D$A$ stage characterized by marshy,grassy meadows.
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Read the following statements carefully and answer the question given below:
$(1)$ $NPP = GPP - R$
$(2)$ Productivity of an ecosystem can be measured in $g/m^2/yr$ or $kcal/m^2/day$.
$(3)$ The total amount of energy produced by all producers in an ecosystem is called Gross Primary Productivity $(GPP)$.
$(4)$ The net primary productivity of the oceans is $55$ billion tons.
State the number of correct statements.
$(1)$ $NPP = GPP - R$
$(2)$ Productivity of an ecosystem can be measured in $g/m^2/yr$ or $kcal/m^2/day$.
$(3)$ The total amount of energy produced by all producers in an ecosystem is called Gross Primary Productivity $(GPP)$.
$(4)$ The net primary productivity of the oceans is $55$ billion tons.
State the number of correct statements.
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View SolutionWhich of the following statements is incorrect?
In an aquatic food chain,at which trophic level can a whale be placed?
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