Question

A set of ‘ecosystem’ is known as
A. Biome
B. Biosphere
C. Atmosphere
D. Hydrosphere

Answer 1

An ecosystem (or ecological system) is made up of all the species that interact with the physical environment. These biotic and abiotic components are linked via nutrient cycles and energy flows. Photosynthesis brings energy into the system, which is absorbed into plant tissue. Animals play a vital part in the transport of materials and energy through the system by eating on plants and each other.

Complete answer:
Option A Biome: A biome is a biogeographical unit made up of a biological community that has evolved in response to a common regional climate. Biomes can be found on multiple continents. Biome is a more general phrase than habitat, and it can refer to a wide range of habitats. Biome is a set of ecosystems; hence option A is the correct answer.
Option B Biosphere: The biosphere, often called the ecosphere, is the totality of all ecosystems on the planet. It's also known as the Earth's life zone. In terms of matter, the biosphere is essentially a closed system with few inputs and outputs. Since the biosphere is not a set of ecosystems, option B is not correct.
Option C Atmosphere: An atmosphere is a layer or series of layers of gases that surround a planet or other material body and are held in place by gravity. The atmosphere is a gaseous composition that envelops the planet. The atmosphere on Earth contributes to the existence of life. Since the atmosphere is not a set of ecosystems, option C is not correct.
Option D Hydrosphere: The total amount of water on a planet is referred to as a hydrosphere. The hydrosphere is made up of water on the planet's surface, underground, and in the atmosphere. Since the hydrosphere is not a set of ecosystems, option D is not correct.

Therefore option A. Biome is the correct answer.

Note:
A microbiome is a collection of organisms that coexist in a specific place on a much smaller scale than a biome. From local geographic scales and instantaneous temporal scales all the way up to whole-planet and whole-time scale spatio-temporal scales, a 'biota' is the whole collection of organisms of a geographic region or time period.