In pond ecosystem, diatoms represent
Producers
Primary consumer
Secondary consumer
Tertiary consumer
The living organisms of all ecosystems collectively consitute
Which of the following in an ecosystem exhibits one-way flow rather than cyclic flow
$A$ : Detrivores and decomposers hold up a part of nutrients contained in detritus.
$R$ : Immobilised nutrients cannot be available for solubilisation after the death of saprotrophs.
Food and energy relationships among living components of ecosystem is generally referred as
Primary productivity varies from ecosystem to ecosystem. Explain ?