Question

Which is not true regarding the ecosystem?
A. Self sufficient unit
B. Cyclic exchange of materials between living beings and environment
C. Only requirement is input of energy
D. Characterized by a major vegetation type

Answer 1

Hint: An ecosystem is a population of living species that interact as a system with the nonliving elements of their surroundings. Nutrient cycles and energy flows bind these biotic and abiotic components together.

Complete answer:
All living things in an ecosystem interact, cohabit, and are interdependent in natural conditions. This allows an ecosystem to self-maintain. Any change in any of these causes the ecosystem to collapse.
An ecosystem is a population of living species that interact as a system with the nonliving elements of their surroundings. Nutrient cycles and energy flows bind these biotic and abiotic components together. When a chemical enters living beings, stays for a long time, and then returns to the nonliving environment, a pathway is constructed. Cycling refers to the exchange of chemicals between a living organism and a nonliving reservoir within an ecosystem.
Ecosystems do not recycle energy, and each one requires a constant supply of energy to be alive. Each level of the food chain or food web in an ecosystem transforms some energy.
The control of several biogeochemical cycles, such as water, carbon, and nitrogen, is influenced by vegetation, which is a major component of an ecosystem. Solar energy is converted into biomass by vegetation, which is the foundation of all food systems. Wildlife habitat and food are provided by vegetation.

That is energy is frequently transferred from one form to another in an ecosystem. The transport of nutrients within the ecosystem is driven by the flow of energy through the ecosystem.

So, option C is the correct option.

Note: Many of these cycles rely on decomposers to return nutrients to the soil, water, or air, where they can be utilised again by the ecosystem's biotic constituents.