Choose correct sentence.
Except for the deep sea hydro - thermal ecosystem, sun is the only source of energy for all ecosystems on earth of the incident solar radiation more than 50 percent of it is photo synthetically active radiation (PAR).
Plant capture only $10-20$ percent of the PAR and this small amount of energy sustains the entire living world.
All organisms are dependent for their food on producers.
Primary producers in an aquatic ecosystem are zooplanktons.
During food chain the maximum energy is stored in
The dominant second trophic level, in a lake ecosystem, is
The amount of organic matter stored by green plants in a unit time and area is called
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
What is the ultimate source of energy for the ecosystems ?