In primary succession in water,the pioneer species are

The number of organisms present at any trophic level in an ecosystem depends on which of the following factors?

Which of the following would appear as the pioneer organisms on bare rocks?

Distinguish between gaseous and sedimentary cycles.
$I-$ Sulfur cycle
$II -$ Nitrogen cycle
$III -$ Carbon cycle
$IV -$ Phosphorus cycle
Identify the correct grouping for (Gaseous cycle,Sedimentary cycle).

Which of the following pairs represents sedimentary types of biogeochemical cycles?

The amount of nutrients,such as carbon,nitrogen,phosphorus,calcium,etc.,present in the soil at any given time is referred to as $..........$.