Biology- Ecosystem

Less than 1% ✘ 2-10% ✘ 0% ✘ 0% ✔

Which of the following ecosystems is most productive in terms of net primary production? ✘ Tropical rain forests ✘ Oceans ✘ Estuaries ✔

inorganic nutrients from humus ✘ both organic and inorganic nutrients from detritus ✘ organic nutrients from humus ✘ inorganic nutrients from detritus and formation of humus. ✔

stratosphere ✘ atmosphere ✘ ionosphere ✘ lithosphere ✔

phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees. ✘ phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees. ✘ free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees. ✘ phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees. ✔

It begins on a bare rock. ✘ It begins on a bare rock. ✘ It follows primary succession. ✘ It is similar to primary succession, but has a relatively fast pace. ✔

serai community ✘ pioneer community ✘ climax community ✘ all of these ✔

Phytoplanktons ✘ Lichens ✘ Bryophytes ✘ Sedges ✔

Zooplanktons. ✘ Small insects ✘ Phytoplanktons ✘ Small fishes ✔

Nitrogen cycle ✘ Carbon cycle ✘ Phosphorus cycle. ✘ Oxygen cycle ✔