Transfer of material and energy from one ecosystem to other ecosystem is best examplified by
Harvesting of fishes
Grazing of pastureland
Game hunting in Savannah
Silvicultural practices in a woodland
Whale is
Give an account of energy flow in an ecosystem
What will happen to an ecosystem if :
$(a)$ All producers are removed;
$(b)$ All organisms of herbivore level are eliminated; and
$(c)$ All top carnivore population is removed
In a food chain of grassland ecosystem, the top consumers are
The above represents