4.1 Bioenergetics
The reactants in photosynthesis are…
Carbon dioxide and water
What energy source is needed for
photosynthesis?
Light
The products of photosynthesis are…
Glucose and oxygen
Word equation for photosynthesis
Carbon dioxide + water Glucose + oxygen
Symbol equation for photosynthesis
CO2 + H2O C6H12O6 + O2
What type of reaction is
photosynthesis?
An endothermic reaction in which energy is
transferred from the environment to the
chloroplasts by light.
Factors that effects the rate of
photosynthesis are…
Light intensity
Temperature
Carbon dioxide concentration
Chlorophyll
Rate is……………..
The amount over a certain time
How is glucose from photosynthesis
used?
• respiration
• converted into insoluble starch for storage
• to produce fat or oil for storage
• to produce cellulose, which strengthens the
cell wall
• to produce amino acids for protein synthesis
What do plants need to make
proteins?
Plants use glucose (photosynthesis) and nitrate
ions that are absorbed from the soil.
What is cellular respiration?
An exothermic reaction which is continuously
occurring in living cells.
Aerobic respiration is …………
Respiration that takes place using oxygen
Anaerobic respiration is…
Respiration that takes place without oxygen
What do organisms use energy for?
•chemical reactions to build larger molecules
•movement
•keeping warm.
Word equation for aerobic respiration
Glucose + oxygen carbon dioxide + water
Symbol equation
C6H12O6 + O2 CO2 + H2O
Word equation for anaerobic
respiration
Glucose lactic acid
Why is less energy produced by
anaerobic respiration?
Oxidation of glucose is incomplete
Equation for anaerobic respiration in
yeast
Glucose ethanol + carbon dioxide
What is anaerobic respiration in yeast
cells called
Fermentation
Why is anaerobic respiration in yeast
important?
Has economic importance in the manufacture of
bread and alcoholic drinks.
