Q.Draw a pyramid from following details and explain in brief.
Quantities of organisms are given - Hawks-50, plants-1000, rabbit and mouse-250 +250, pythons and lizard- 100 + 50 respectively.

An ecological pyramid is a graphic device, introduced by Charles Elton in 1927 (hence also called an Eltonian pyramid), for representing an ecosystem's trophic structure and function at each successive trophic level. Three types exist. A pyramid of number plots how many organisms occupy each level; it is always upright in grassland and pond ecosystems (numbers steadily fall from producers to tertiary consumers), spindle-shaped in a forest ecosystem (the producer base is a smaller number of very large trees, herbivores like fruit-eating birds/elephants/deer actually outnumber them, and top predators like lions are again fewer than the secondary consumers below them), and always inverted in a parasitic ecosystem (starting from one host and increasing in number at each successive, smaller parasite/hyperparasite level). A pyramid of biomass plots the amount of organic material at each level: grassland and forest ecosystems are upright (biomass falls steadily from producers to top carnivores), but a pond ecosystem is inverted, because its producer base (phytoplankton) has very low biomass despite huge numbers, so biomass actually rises toward the …