plant nutrition and transport

• photosynthesis


  the process in which light energy is converted to chemical energy in the form of sugars
• limiting factor


  when a process depend on 2 or more factors. the rate of that process is limited by the factor with the shortest supply.
• limiting factors of photosynthesis

  light intensity, carbon dioxide and temperature
• optimum


  the most favorable condition for the growth and reproduction of an organism
• hydrogen carbonate indicator


  detects increase (yellow) and decrease (purple) change in CO2 concentration
• nitrogen


  amino acids and protein
• nitrogen deficiency


  stunted growth and older leaves turn yellow
• phosphate 


  make cell membranes and DNA for respiration and growth
• phosphate deficiency 


  poor root growth and older leaves turn purple
• potassium


  help enzymes for photosynthesis and respiration
• potassium deficiency


  poor flower and fruit growth and discoloured leaves
• magnesium


  to make chlorophyll for photosynthesis
• magnesium deficiency


  yellow leaves
• xylem


  transport water and minerals
• xylem


  transports water and minerals from the shoot to leaves
• transpiration


  loss of water by evaporation from plants into the air
• factors that effect transpiration


  light intensity, temperature, wind speed, humidity
• potometre


  apparatus that is used to estimate how different factors affect the transpiration rate