Which of the following correctly describes an abiotic component of the environment?

Question

Which of the following correctly describes an abiotic component of the environment?

1. A. Green plants synthesizing organic matter through photosynthesis
2. B. Wind patterns influencing erosion and sediment transport (Correct answer)
3. C. Decomposer microbes breaking down organic waste
4. D. Predation of deer by tiger in a forest ecosystem

Correct Answer

Option B — Wind patterns influencing erosion and sediment transport

Detailed Solution & Explanation

The correct answer is Wind patterns influencing erosion and sediment transport.

Key Points

• Abiotic components are the non-living physical and chemical parts of an ecosystem: light, temperature, wind, water, air, soil minerals, pH and topography. Wind is a physical force, so wind-driven erosion is an abiotic process.
• Every other option describes an activity performed by a living organism, which makes it biotic:
  • green plants photosynthesising — producers,
  • decomposer microbes breaking down waste — decomposers,
  • a tiger preying on deer — a consumer interaction.

Additional Information

• The reliable test is to ask who or what is acting. If the actor is alive, the component is biotic; if it is a physical or chemical agent, it is abiotic. Note that a dead log or leaf litter is abiotic in this classification even though it was once living.
• Abiotic factors set the limits within which organisms can live, which is why they are called limiting factors — Liebig's Law of the Minimum holds that growth is governed by the scarcest essential resource, not the total available.
• Biotic components are conventionally grouped as producers (autotrophs), consumers (heterotrophs) and decomposers (saprotrophs), and energy flows one way through them while nutrients cycle.
• Abiotic and biotic components together with their interactions constitute an ecosystem, a term coined by A. G. Tansley in 1935.