Abyssal zone of oceans is characterized by
Presence of sunlight and producers
Absence of sunlight and all living organisms
Absence of sunlight but presence of producers
Absence of sunlight and presence of consumers and decomposers
In a food chain of grassland ecosystem, the top consumers are
The statement, "Tiger is in the apex of food chain', indicates
Driving force of an ecosystem is
Given food web contains some missing organisms $A, B, C$ and $D$. Identify these organisms and select the correct answer