|1. The movement of water in xylem is a passive phenomenon dependent on the pull of transpiration and the cohesion of water molecules, whereas the translocation of sugars in the phloem is best described by the Pressure Flow Hypothesis.
2. Plants are dynamic metabolic systems with hundreds of biochemical reactions occurring each second, which enable plants to live, grow, and respond to their environment.
3. Life on Earth is dependent on the flow of energy from the sun, and photosynthesis is the process during which plants convert carbon dioxide and water into sugars using this solar energy.
4. In cellular respiration, the chemical-bond energy in sugars is converted into an energy-rich compound, ATP, which can then be used for other metabolic reactions.