Which of the following is an important biotic factor in ecosystems?

• A. Soil pH
• B. Sunlight
• C. Temperature
• D. Producers (such as plants and algae)

Answer: (D)

Verified step by step guidance

1. Understand the difference between biotic and abiotic factors: Biotic factors are living components of an ecosystem, such as plants, animals, fungi, and microorganisms. Abiotic factors are non-living components, such as soil pH, sunlight, and temperature.
2. Analyze the options provided: Soil pH, sunlight, and temperature are all abiotic factors because they are non-living environmental conditions.
3. Recognize that producers, such as plants and algae, are living organisms that play a crucial role in ecosystems by converting sunlight into energy through photosynthesis. This makes them biotic factors.
4. Recall that biotic factors influence the structure and function of ecosystems by interacting with other living organisms and abiotic factors.
5. Conclude that the correct answer is 'Producers (such as plants and algae)' because they are living components (biotic factors) essential for energy flow and nutrient cycling in ecosystems.