Choose correct answer.

$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.

$(2)$ Decomposition is largely an oxygen requiring process.

$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.

$(4)$ The amount of energy decreases in each successive trophic level.

Which of the following is a primary consumerin maize field ecosystem ?

The dominant second trophic level, in a lake ecosystem, is

In an ecosystem

The rate of formation of new organic matter by rabbit in a grassland, is called