An ecosystem must have continuous external source of
Food
Minerals
Energy
All of the above
How many food chains are there in the food web shown above?
Source of energy in an ecosystem is
Which of the following ecosystems has highest productivity?
$A$ : 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.
In the following, there is no difference.