Question

aquarium needs to be cleaned once in a while whereas ponds or lakes do not require any cleaning. explain. ​

Answer 1

Answer:

Explanation:

In the Aquarium the uneaten food as well as the waste generated by the fishes mixes with the water and is left untreated due to the lack of decomposers. The waste materials thus accumulate in the water making it toxic. Hence an aquarium has to be cleaned after regular intervals.

Answer 2

Ponds and lakes are natural ecosystems and contain perishable elements.

Explanation:

• The digesters act as cleansing agents here, where the aquarium is an artificial ecosystem, not the digester that cleans it.
• The aquarium is an artificial system that is also incomplete due to the absence of producers, food chains and digesters.
• There is no reusable and self-cleaning.
• However, a pond or a lake is a self-contained, natural and complete ecosystem where nutrients are perfectly recyclable.