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
Which of the following are consumers of second order
The bacteria which attack dead animals are
The mass of living material at a trophic level at a particular time is called
Identify the possible link “$A$” in the following food chain.
Plant $→$ Insect $→$ Frog $→$ “$A$” $→$ Eagle
The trophic level of lion in a forest ecosystem is