Question

Pyramid of numbers in a pond ecosystem is
A. Irregular
B. Inverted
C. Upright
D. Spindle shaped

Answer 1

Hint:This type of number pyramid is also located in the grassland ecosystem. In this type of pyramid the number of consumers is less than the number of producers.

Complete answer:
A pond ecosystem refers to a freshwater ecosystem where populations of species rely on each other for their nutrition and survival in the prevalent water climate. A pond is a calm water body that is too small for tidal activity and too shallow for large temperature variations from top to bottom. It typically has a dirty or silky bottom with aquatic vegetation along and along the sides. A pond ecosystem contains abiotic components like light, temperature, carbon dioxide, dissolved oxygen, etc. and biotic components consisting of producers, consumers and decomposers. The producers are the green plants including phytoplanktons, hydrilla, etc. The consumers are those heterotrophic organisms that consume producers. Some of the consumers in the pond ecosystem are insects, fishes, frogs, crabs, etc. Most decomposers of the pond ecosystem are saprophytes but some parasites are also found.
The number pyramid is a graphic representation that indicates the number of species at each trophic stage. It is an upright pyramid in the light of the fact that in the ecosystem, producers are usually more abundant than other trophic stages. The upright pyramid is located in the grassland ecosystem. This ecosystem is characterized by a number of autotrophs that support smaller herbivores. In contrast, herbivores assist a reduced number of carnivores. This pyramid is also upright. Namely, for each higher trophic stage, the number of species is decreasing.
The pond ecosystem reflects an upright pyramid of numbers. Phytoplankton, including algae and bacteria, are the producers here and thus the largest in number. The smaller herbivorous fish are fewer than the producers. Likewise, small carnivorous fish are less than herbivorous ones. Finally, the apex consumers or the largest carnivorous fish are the least counted.

Thus, the correct answer is option C. i.e., Upright.

Note:The highest energy in the pond ecosystem is at the producer level, followed by the primary consumer level, followed by the secondary consumer level. The foundation of the number pyramid is represented by the producers in the ecosystem of the pond.