Describe pyramid of energy with the help of diagram.

Answer:

[Figure: Pyramid of energy — an upright pyramid with a broad base of producers (e.g. 1000 kcal/m²/yr), then primary consumers (100), secondary consumers (10) and tertiary consumers (1) at the narrow apex.]

1. A pyramid of energy is a graphic representation of the amount of energy (flow of energy) at successive trophic levels of a food chain per unit area per unit time (e.g. kcal/m²/year).
2. Producers at the base have the maximum energy; energy decreases at each higher trophic level.
3. According to Lindeman’s 10% law, only about 10% of the energy of one trophic level is transferred to the next; the rest is lost as heat in respiration and other activities.
4. Therefore the pyramid of energy is always upright; it can never be inverted, as energy flow is unidirectional.