The second order consumer in a food chain is
Cattle
Deer
Tiger
Goat
An ecosystem must have continuous external source of
In pond ecosystem, diatoms represent
Suppose $2000 \mathrm{~J}$ of solar energy is incident on green vegetation. On the basis of $10 \;\%$ law of Lindeman. Identify $A, B$ and $C$
In an ecosystem, the population of
Nektons are