Given food web contains some missing organisms $A, B, C$ and $D$. Identify these organisms and select the correct answer
$A-$Deer, $B-$Frog, $C-$Foxes, $D-$Sparrow
$A-$Dog, $B-$Squirrel, $C-$Deer, $D-$Hawks
$A-$Cat, $B-$Eagle, $C-$Cow, $D-$Rat
$A-$Eagle, $B-$Sparrow, $C-$Dog, $D-$Cat
Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.
Energy flow in ecosystem is
What is common to earthworm, mushroom, soil mites and dung beetle in an ecosystem.
Food and energy relationships among living components of ecosystem is generally referred as