Question

What is an ecological pyramid? Describe different types of ecological pyramid with diagram.

Hint:

Three types: pyramid of numbers, biomass, and energy. Only the energy pyramid is always upright.

Answer 1

Understanding the Question:
An ecological pyramid is a graphical way of showing the relationship between different trophic levels of an ecosystem, in terms of number, biomass, or energy, with producers forming the base.

Detailed Explanation:
The pyramid of numbers shows the count of individual organisms at each trophic level; it is usually upright, with many producers supporting fewer herbivores and even fewer carnivores, though in a forest ecosystem a few large trees (producers) can support far more herbivores, giving an inverted shape at the base.
The pyramid of biomass shows the total dry weight of organisms at each level; in most land ecosystems it is upright since biomass decreases going up the food chain, but in a pond ecosystem it can be inverted, since the standing crop of phytoplankton at any instant is small even though it reproduces very fast to support a larger fish biomass.
The pyramid of energy shows the amount of energy present at each trophic level, and this pyramid is always upright and never inverted, because energy is always lost as heat at each transfer (the ten percent law), so the level below always has more usable energy than the level above it.
Diagram (described): draw the widest bar at the bottom labelled Producers, a narrower bar above it labelled Primary Consumers, a still narrower bar above that labelled Secondary Consumers, and the narrowest bar at top labelled Tertiary Consumers, stacked to form a triangular pyramid shape (this shape may invert for the number or biomass pyramid in specific ecosystems, but never for the energy pyramid).

Final Answer:
An ecological pyramid plots trophic levels as number, biomass, or energy; the pyramids of number and biomass can sometimes be inverted, but the pyramid of energy is always upright because energy is lost as heat at every transfer.