TRANSPIRATION

• Cells need sugars for respiration as well for providing materials for growth
• Cells need mineral ions for production of proteins and other molecules in the cell
• Cells need water for photosynthesis and ensures plant can hold itself upright
• When a cell has lots of water inside it, vacuole presses cytoplasm against cell wall this pressure gives support to the structure of the leave and young plants
• As light intensity increases, rate of transpiration increases because water is reactant of photosynthesis
• As temperature increases, rate of transpiration increases because more kinetic energy so particles move faster causing more collisions
• As humidity increases, rate of transpiration decreases because lower concentration gradient so water vapour will diffuse out at slower rate
• As wind increases, rate of transpiration increases as more water can evaporate and wind removes water vapour from outside stomata increasing concentration gradient