Consider the following statements about ecological pyramids
$I.$ Charles Elton developed the concept of ecological pyramid
$II.$ After the name these pyramids are also called as Eltonian pyramids
$III.$ It is a graphical representation or pyramid shaped diagram which depicts the number of organisms, biomass and energy at each trophic level
Which of the statements given above are correct?
$I\;and\; II$
$I\; and\; III$
$II\; and \;III$
$I, II\; and \;III$
The pyramid of number in a grassland ecosystem is
$A $ : Ecological pyramid of biomass is generally inverted in sea.
$R$ : Biomass of fishes far exceeds that of phytoplanktons.
Which of the following representations show the pyramid of numbers in a grassland ecosystem?
Which of the following organisms were not given any place in ecological pyramids?