$Y-$shaped energy flow model was given by

The main source of energy in an ecosystem is .........

Percentage of Photosynthetically Active Radiation $(PAR)$ that is captured by plants in the synthesis of organic matter is

The amount of stored energy is highest in .........

An ecosystem must have a continuous external source of

The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows . . . . . . %. (in $%$)