Question

Largest ecosystem of the world are:
A. Grasslands
B. Lakes
C. Oceans
D. Forests

Answer 1

Hint: An ecosystem can be defined as a community of all different living organisms along with the abiotic or the physical component. Both the living as well as the nonliving components interact and are linked with one another. The characteristic of an ecosystem depends on the different biological properties of the flora and fauna falling under it and also due to the physical part of the environment such as air, water, minerals etc.

Complete answer:
The grassland habitat is a region where the landscape is mostly dominated by grass and other herbaceous and other non-woody plants. It is often called a transitional landscape because grassland habitats are dominated by grass with little to no trees in the region and where there is not enough for a forest and too much of a forest. The fauna of such an ecosystem is reflected by rich invertebrate fauna and grazing vertebrates. Depending on how they are described, the grasslands account for between twenty and forty per cent of the world's land area.
A forest ecosystem is a natural forest unit consisting of all plants, animals and microorganisms in that region and all non-living physical environmental factors. It occupies about thirty-one per cent of the total land area.
The lake ecosystem includes the aquatic biotic living plants, animals and microorganisms as well as abiotic. They are associated and linked in physical and chemical interactions. The habitats of the lake are a prime example of lentic habitats. The lakes have a total surface area of around five million square kilometers which is approximately four per cent of the earth's non-glaciated land region.
The largest habitat or ecosystem in the world is the oceans. They cover seventy-eight per cent of the earth's atmosphere. The open sea or pelagic portion of the ocean is divided into limnetic or photic zone up to two-hundred meters deep, where light penetrates to the aphotic zone which extends to two-hundred to two-thousand meters deep, where little light penetrates and abyssal zone or dark zone.

Hence, The correct answer is option (B).

Additional information:
The integrity of the ecosystem is determined both structurally and functionally. The composition of the ecosystem comprises both biotic and abiotic elements. The working of the environment involves the transfer of energy and the cycling of minerals. The ocean is the most stable and largest ecosystem. It is stable due to its natural liquid nature (saline), dissolved oxygen, light and temperature.

Note: The integrity of the ecosystem is determined both structurally and functionally. The composition of the ecosystem comprises both biotic and abiotic elements. The working of the environment involves the transfer of energy and the cycling of minerals. The ocean is the most stable and largest ecosystem. It is stable due to its natural liquid nature (saline), dissolved oxygen, light and temperature. The largest ecosystem on the planet is the oceans. About seventy-eight per cent of the earth's surface is a source of food for more than three billion people.