bioenergetics

• word equation for photosynthesis

  carbon dioxide + water = glucose + oxygen
• how does temperature effect the rate of photosynthesis?

  • Increasing the temperature increases the rate of photosynthesis because more energy is provided.
  • But, if the temperature is increased to above about 45°C, the enzymes that catalyse (speed-up) the reaction begin to denature (not work anymore).
  • This causes the rate of the reaction to drop sharply until it stops altogether.
• how does chlorophyll concentration affect the rate of photosynthesis?

  high chlorophyll concentration gives a high rate of photosynthesis
• what affect does light intensity have on the rate of photosynthesis?

  • A greater light intensity means a greater rate of photosynthesis. This is because more energy is being provided.
  • But, if the light intensity is increased above a certain threshold, the rate of photosynthesis will not increase because another factor (such as temperature) is limiting the rate of the reaction.
• what affect does increasing the carbon dioxide conc increase the rate of photosynthesis?

  increases it due to it being a reactant but above a certain threshold,  further increases in the carbon dioxide concentration do not increase the rate of photosynthesis because another factor (such as light intensity) is limiting the rate of reaction.
• what do organisms need energy for?

  growth , muscle contraction and homeostasis
• symbol equation for photosynthesis

  6CO2 + 12H2O + Light Energy ------> C6H12O6 + 6O2 + 6H2O
• what can glucose be changed into ?

  insoluble starch: stored in the stem , leaves or roots

  fat or oil

  cellulose which is used to strengthen the cell wall

  proteins which are used for growth and for enzymes
• equation for aerobic respiration?

  C6H12O6 + 6O2 -> 6CO2 + 6H2O