Transpiration is defined as which process?

• A. The process by which a plant loses water vapor
• B. The process by which a plant takes in carbon dioxide
• C. The process by which roots absorb water
• D. The process by which leaves produce sugar

Answer: (A)

Transpiration is the loss of water vapor from a plant, mainly from the leaves where stomata are located. Water moves up from the roots through the xylem, and as it reaches the leaf surfaces, it evaporates into the air, creating a pull that helps draw more water upward. This loss of vapor is the plant’s water transport system in action and is influenced by factors like stomatal opening, humidity, temperature, airflow, and soil moisture. The other options describe different plant processes: taking in carbon dioxide happens during photosynthesis; roots absorbing water is water uptake; leaves producing sugar is photosynthesis.