AP Environmental Science

Answer: A - Transpiration occurs when plants add water into the atmosphere.

Key Takeaway: Although transpiration and evaporation are similar, try not to get them confused! Evaporation occurs when bodies of water add water into the Earth’s atmosphere. Transpiration is the same activity, but with plants. Water from the leaves, stems, and roots is released into the atmosphere when the plant “breathes” in carbon dioxide, necessary for photosynthesis.