Each trophic level has a certain mass of living material at a particular time,which is known as $..........$.

An ecosystem which can be easily damaged but can recover after some time if the damaging effect stops will have:

Which one of the following systems constitutes the primary producers?

Classify the following ecosystems into their appropriate groups:
$I-$ Forest,$II-$ Grassland,$III-$ Pond,$IV-$ Desert
$V-$ Lake,$VI-$ Wetland,$VII-$ River,$VIII-$ Estuary
Terrestrial Ecosystem $\quad$ Aquatic Ecosystem

The reservoir for the sedimentary cycle exists in

An ecosystem that can be easily damaged but can recover after some time if the damaging effect stops,will have: