Maximum solar energy may be trapped by
Growing grasses
Planting trees
Growing algae in large water bodies
More cultivation of crop plants
Secondary producers are
Nektons are
The food chain which begin with dead organic matter is called
$A$ : 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.
Which of the following has the greatest amount of energy