Identifying the Incorrect Statement on Ecosystems and Waste

The question asks us to identify the statement that is incorrect regarding ecosystems and related environmental concepts. Let's analyze each statement provided in the options.

Analyzing Each Statement

• Statement 1: "Various components of ecosystem are interdependent."

  An ecosystem is made up of living (biotic) and non-living (abiotic) components. These components interact with each other and depend on one another for survival and functioning. For example, plants depend on sunlight and nutrients from the soil (abiotic), while herbivores depend on plants (biotic), and carnivores depend on herbivores (biotic). This statement accurately describes the fundamental nature of an ecosystem.

  This statement is correct.

• Statement 2: "Loss of energy limits the number of trophic levels in an ecosystem."

  Energy flows through an ecosystem from producers to consumers at different trophic levels. At each transfer, a significant amount of energy is lost as heat (typically around 90%). Only about 10% of the energy from one trophic level is available to the next trophic level. Because of this significant energy loss, there is less and less energy available at higher trophic levels, which limits the total number of trophic levels an ecosystem can support.

  This statement is correct.

• Statement 3: "CFC plays major role in ozone depletion."

  CFC stands for Chlorofluorocarbon. These are synthetic chemicals that were widely used in refrigerants, aerosols, and foam blowing. When released into the atmosphere, CFCs rise to the stratosphere where they react with and break down ozone molecules. This process leads to the thinning of the ozone layer, which protects Earth from harmful ultraviolet (UV) radiation from the sun. CFCs are indeed recognized as a major cause of ozone depletion.

  This statement is correct.

• Statement 4: "Waste produced by human activities is always biodegradable."

  Waste produced by human activities can be broadly classified into two categories: biodegradable and non-biodegradable.

  • Biodegradable waste: This type of waste can be broken down by natural processes, such as the action of microorganisms (bacteria and fungi). Examples include food scraps, paper, and yard waste.
  • Non-biodegradable waste: This type of waste cannot be easily broken down by natural processes. Examples include plastics, glass, metals, and certain chemicals. These materials persist in the environment for very long periods.

  Since human activities produce a significant amount of non-biodegradable waste along with biodegradable waste, the statement that human waste is always biodegradable is incorrect.

  This statement is incorrect.

Based on the analysis, the incorrect statement is "Waste produced by human activities is always biodegradable."