Question

A lake ecosystem is
(a) Artificial
(b) Abiotic
(c) Natural
(d) Hydrological

Answer 1

Hint: The lake and pond ecosystem involve biotic e.g. Fish ,bacteria, biotic plants etc as well as abiotic physical and chemical interactions e.g. Oxygen, nitrogen, etc component but this ecosystem present in naturally in environment and hence they are a part of natural ecosystem.

Complete answer:Lake ecosystems are the primary example of lentic ecosystems. Lentic Ecosystem involves natural resources i.e. lakes and ponds. Lentic word refers to stationary bodies or still water. This ecosystem involves biotic as well as abiotic components.

These ecosystems involves algae, shrimps, crabs, amphibians such as frogs and salamanders, rooted and floating-leaved plants and reptiles including alligators and other water snakes found here all are biotic components while temperature, oxygen, nitrogen are physical and biochemical i.e. non-living interaction.
They are important ecosystems that, a healthy balance of aquatic life. In the lake ecosystem, organism’s adaptations are affected by the strengths of their interactions with their physical and biochemical environments and with other species in the food web.

Note: Lake ecosystem requires a continuous input of organic matter, produced mainly by photosynthesis.