Question

The ecological pyramid of numbers in pond ecosystem is
A. Upright
B. Inverted
C. May upright or inverted
D. First upright then inverted

Answer 1

Hint: An ecological pyramid represents the ecological parameters of different trophic levels graphically in per unit area of an ecosystem. Generally, there are three types of ecological pyramids are observed which are the pyramid of biomass, the pyramid of energy, and the pyramid of numbers.

Complete answer:
An ecological pyramid is a graphical design that shows the relationship between biomass, productivity, or energy at different trophic levels. The ecological pyramids start with producers that are at the bottom and end with the apex predators present at the top level.
In the pyramid of numbers, it represents the number of individual organisms at different consecutive trophic levels per unit area of an ecosystem. This pyramid shows the numbers of the producers, present at the bottom and the number of herbivores and carnivores, present at their successive upper trophic levels.
According to the number of individuals, this pyramid is of three types which are upright, inverted, and spindle-shaped pyramid. In the upright pyramid, the number of producers is more than other consumers while the number of primary and secondary consumers gradually increased in the inverted pyramid. In the spindle-shaped pyramid, the number of primary consumers is more than producers and secondary consumers.
In a pond ecosystem, phytoplankton such as algae, bacteria, etc. are the producers that are maximum in number. The small herbivorous or primary consumers like small fishes, rotifers, etc. are lower in number than producers. Secondary consumers like medium fishes and frogs are less in number than primary consumers. Finally, the apex consumers or big fishes present in a pond ecosystem are least in number. In this way, the pyramid of numbers in a pond ecosystem is always upright.

Therefore, the correct option is option A.

Additional information:
The pyramid of Biomass represents the total biomass generated at different consecutive trophic levels per unit area of an ecosystem. Based on the amount of biomass, it can be upright or inverted. The pyramid of energy explains the rate of energy flow and productivity at different consecutive trophic levels. The pyramid of energy is always upright.

Note: An ecological pyramid is the representation of the various ecological parameters like the number of organisms, energy, biomass, etc. found at successive trophic levels. There are three types of ecological pyramid: the pyramid of biomass, the pyramid of energy, and the pyramid of numbers. The pyramid of numbers shows the numbers of organisms. When it gradually increases it is called inverted and when it gradually decreases it called upright. In a pond ecosystem, the number of organisms is reduced gradually, therefore, the ecological pyramid in a pond ecosystem is upright.