In ecological pyramid the base always represent the $...A...$ and the apex represents $...B...$ Here $A$ and $B$ represents
$A-$producers; $B-$top level consumers
$A-$top level consumer; $B-$producers
$A-$producers; $B-$secondary consumers
$A-$producers; $B-$primary consumers
Source of energy in an ecosystem is
Vegetable eating person acts as
Give an account of energy flow in an ecosystem
Distinguish between
$(a)$ Grazing food chain and detritus food chain
$(b)$ Production and decomposition
$...A...$ is required for higher primary productivity. $...B...$ have the lowest primary productivity as the soil is deficient in moisture.
Choose the correct option for $\mathrm{A}$ and $\mathrm{B}$