A rat feeding upon potato tuber is
The trophic level of Cuscuta, Orobanche and Albugo is
What is primary productivity? Give brief description of factors that affect primary productivity.
In a food chain of grassland ecosystem, the top consumers are
$...A...$ 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 $\mathrm{B}$