Which of the following are called key industry animals?

Where does the bulk of $CO_2$ fixation occur?

$A$ plant being eaten by a herbivore,which in turn is eaten by a carnivore,constitutes a:

The individual transitional communities in ecological succession are termed as

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.

Which ecosystem has the highest biomass?