$...A...$ 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 $\mathrm{B}$
$A-$Rain; $B-$desert
$A-$Heat; $B-$forest
$A-$Rain; $B-$forest
$A-$Forest; $B-$desert
In an ecosystem, there is flow of energy at different trophic levels. This is as follows :
Source of energy in an ecosystem is
How many food chains are there in the food web shown above?
Identify the possible link “$A$” in the following food chain.
Plant $→$ Insect $→$ Frog $→$ “$A$” $→$ Eagle
Among the following, what happens in abiotic components of an ecosystem