Answer:
Ecological Pyramids An ecological pyramid
is a graphical representation of an ecological parameter as number of
individual present in various trophic level of food chain. Properties of
ecological pyramid
(i) The trophic structure of an
ecosystem is represented in the form of ecological pyramids.
(ii) The base of each pyramid
represents the producers or the first trophic level, while the apex represents
tertiary or top level consumer.
The three types of ecological
pyramids are
(a)Pyramid of number
shows relationship between producers and consumers in an ecosystem in terms of
numbers. It may be inverted or upright pyramid.
(b)Pyramid of biomass shows
relationship between producers and consumers in anecosystem terms of biomass.
It can be
(a) Upright, e.g., in case of
grass land ecosystem.
(b) Inverted, e.g., in case of pond
ecosystem.
Inverted pyramid of biomass.
Small standing crop of
phytoplankton supports large standing crop of zooplankton
(c) Pyramid of energy is the
relationship between producers and consumers in anecosystem in terms of flow of
energy. It is always upright because energy is always lostas heat at each step.
An ideal pyramid of energy.
Observe that primary producers convert only 1% of the energy of the sunlight
available to them into Net Primary Productivity.
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