In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
Consumers
Producers
Decomposers
None of these
The number of trophic levels in a food chain is limited to $4$ or $ 5$ because
The green plants are removed from an aquarium
Whale is
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
Which of the cycle is concerned with energy flow in the ecosystem