Correct Option: D. Temperature Explanation of the Correct Answer In ecology, an ecosystem is made up of both biotic (living) and abiotic (non-living) components. Understanding the distinction between these two categories is crucial for studying how ecosystems function.

1. Biotic Components: These are the living parts of an ecosystem. They include:
2. Plants (Option A): They are primary producers that convert sunlight into energy through photosynthesis, forming the base of the food chain.
3. Animals (Option B): These are consumers that can be herbivores, carnivores, or omnivores, and they play various roles in the food web.
4. Fungi (Option C): These organisms decompose organic matter, recycling nutrients back into the ecosystem.
5. Abiotic Components: These are the non-living parts of an ecosystem that influence the living organisms. They include factors such as:
6. Temperature (Option D): This is a physical factor that affects the metabolic rates of organisms, the types of species that can survive in an environment, and the overall climate of the ecosystem.

Since temperature is a non-living factor that influences the ecosystem but does not consist of living organisms, it is classified as an abiotic component. Therefore, it is the correct answer to the question of which factor is NOT considered a biotic component. Explanation of Why Other Options Are Incorrect

• Option A: Plants: Plants are essential biotic components as they produce energy through photosynthesis and provide food and habitat for other organisms.
• Option B: Animals: Animals are also biotic components, as they interact with plants and other organisms, forming complex food webs and contributing to the ecosystem's dynamics.
• Option C: Fungi: Fungi play a critical role in decomposition and nutrient cycling, making them a vital part of the biotic community in ecosystems.

Summary of Key Points

• Biotic components include all living organisms: plants, animals, and fungi.
• Abiotic components include non-living factors like temperature, water, soil, and sunlight.
• Temperature is a crucial abiotic factor that affects living organisms but is not a living component itself.
• Understanding the distinction between biotic and abiotic factors is essential for studying ecosystems and their interactions.

Revision Summary

• Biotic components are living organisms (plants, animals, fungi).
• Abiotic components are non-living factors (temperature, water, soil).
• Temperature is an abiotic factor, making it the correct answer to the question.
• Recognizing the roles of both biotic and abiotic components is vital for understanding ecosystem dynamics.