If all the green plants were to disappear from the earth,what would happen?

How many of the following organisms are decomposers in a pond ecosystem?
Some algae,fungi,bacteria,floating plants,submerged plants,flagellates.

The bulk fixation of carbon through photosynthesis takes place in

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.

Which of the following can be identified as secondary consumers?

The given food web contains some missing organisms $A, B, C$ and $D$. Identify these organisms and select the correct answer.