The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

The natural reservoir of phosphorus is ...

The two vegetation zones of an ecosystem are separated by

Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain,establish various linkages between the organisms on the principle of 'eating and being eaten'. What is this inter-linkage established known as?
Algae,hydrilla,grasshopper,rat,squirrel,crow,maize plant,deer,rabbit,lizard,wolf,snake,peacock,phytoplankton,crustaceans,whale,tiger,lion,sparrow,duck,crane,cockroach,spider,toad,fish,leopard,elephant,goat,nymphae,spirogyra.

Why do submerged plants receive weaker illumination than exposed floating plants in a lake?

In ecological succession,the seral forms are: