Other Theorists (Gesell, Bronfenbrenner, Bowlby…)
Asked 2 months ago · Viewed 15 times
Consider the following statements regarding ecological pyramids and their various types:
- 1. The concept of the ecological pyramid was first proposed by Charles Elton, also known as 'Eltonian pyramids', which outline the relationships of organism numbers, biomass, or energy at different trophic levels.
- 2. In a normal terrestrial ecosystem, the 'pyramid of numbers' is always upright because the number of producers (trees and plants) is overwhelmingly greater than that of herbivores and carnivores.
- 3. In contrast, in a large tree ecosystem, the 'pyramid of numbers' becomes inverted because the number of birds (herbivores) dependent on a single giant tree (producer) and the parasites thriving on them successively increases.
- 4. The 'pyramid of energy' in any ecosystem is always and invariably upright, following Lindeman's 10% Law, under which only 10 percent of energy is transferred from one trophic level to the next.
Which of the above statement(s) is/are completely true?
✓ Correct! Well done.
✗ Not quite — the correct answer is highlighted above.
Detailed Explanation
All the given statements regarding ecological pyramids are completely true. Charles Elton discovered them in 1927. The pyramid of numbers is upright in a terrestrial ecosystem while it becomes inverted in the case of a single tree. The pyramid of energy always remains upright because energy flow is unidirectional and 90% of energy is lost at each level.
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