$10\%$  law of flow of energy in ecosystem was proposed by

The trophic level of Cuscuta, Orobanche and Albugo is

$...A...$ 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 $\mathrm{B}$

In a food chain, lion is a

Trophic levels are formed by

What energy percentage can be captured by the organisms of next trophic level