In a food chain, the total amount of living material is depicted by

Assertion : In a food chain, members of successive higher levels are fewer in number.
Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Which of the following statements is incorrect regarding the pyramid of energy, while three are correct?

$A$: Ecological pyramid of biomass is generally inverted in the sea.
$R$: Biomass of fishes far exceeds that of phytoplanktons.

Which type of ecological pyramid is always upright when representing the functional aspects of an ecosystem?