5.02 Relationship of carbon cycle to photosynthesis and respiration

Carbon All life is based on carbon Carbon is part of proteins, carbohydrates, fats, and other important molecules.

Process Photosynthesis: Autotrophs use energy from the sun, water, and carbon dioxide to produce glucose and release oxygen. Respiration: Autotrophs and Heterotrophs must break down glucose into a useable form of energy (ATP)

Carbon Cycle: Part 1 1. Carbon cycle begins with autotrophs 2. Autotrophs produce glucose through photosynthesis. 3. Heterotrophs feed on autotrophs directly or indirectly. 4. Heterotrophs use those carbon molecules for growth and energy

Carbon Cycle: Part 2 5. When autotrophs and heterotrophs use the carbon molecules and release energy, carbon dioxide is released and returns to the atmosphere. 6. Carbon dioxide continually cycles as it is located in soil, leaves, roots, oil, coal, and fossils

Carbon Cycle 3 Carbon returns to Earth through respiration, excretion, and decomposition Animals release carbon dioxide when they decompose or respire Burning wood and fuel excretes carbon into the atmosphere Decomposing animals and plants leach carbon into the ground, forming fossil fuels such as coal or oil