What is the beginning of the detritus food chain/web?

Death of an organism

The correct answer is Option (3) – Death of an organism

The detritus food chain/web starts with the death of an organism. When plants, animals, or other organisms die, their bodies become detritus, which is dead organic matter. This detritus is then broken down by decomposers like bacteria, fungi, and detritivores (such as earthworms and certain insects). These decomposers play a crucial role in recycling nutrients back into the ecosystem, making them available for primary producers (plants) to use again. This process is essential for maintaining the flow of energy and cycling of nutrients within an ecosystem.

• Photosynthesis: This is the process by which primary producers (such as plants) convert sunlight into chemical energy, and it marks the beginning of the grazing food chain, not the detritus food chain.
• Consumption by primary consumers: This refers to herbivores eating plants and is part of the grazing food chain.
• Respiration: This is the process by which organisms convert organic molecules into energy, and it occurs throughout all levels of the food chain, not specifically marking the beginning of any food chain.