Question

Which of the following constitutes the largest ecosystem of the world?
A) Ocean
B) River
C) Forest
D) Grassland

Answer 1

Hint: Ecosystem is a biological community of interacting organisms and their physical environment. It provides habitat to wild plants and animals and promotes various food chains and food webs.

Complete answer:
A) Ocean –Largest ecosystem of the world are oceans. Oceans occupy 78%of earth’s surface. It includes all the gaseous, liquid and solid water of the earth.
- The ocean water is in continuous circulation. According to Odum, Marine ecology emphasizes the totality or pattern of relationship between organisms and the sea environment. Each ocean itself represents a very large and stable ecosystem. An ecosystem is a community of living organisms interdependent with non-living components of their environment. They interact with each other. Ecosystems can be very small as small ponds or large as oceans, rain forests etc. In the Ecosystem the flow of energy is kept on going. Oceans are the largest ecosystem and are considered to cover the show as far as tidal water comes in.
B) River – River is naturally flowing water, usually fresh water and it includes biotic and abiotic components.
C) Forest – It includes plants, animals, fungi, bacteria etc. forest ecosystem is complex and highly diverse.
D) Grassland – Here vegetation is dominated by grasses and non-woody plants like herbs and shrubs.

Hence the correct answer is option A. Ocean.

Note:Ocean composes much of planet hydrosphere. Ocean provides evaporated water to the water cycle and also allows water to move all around the globe as ocean currents.