Slide 2 Section 2 Cell energy All cells need energy to live,
grow, and reproduce. Plant cells get their energy from the sun Many
animal cells get the energy they need from food Slide 3 From the
sun to the cell Energy flows from: Sun Plants Animals
Photosynthesis is the process by which plants, algae, and some
bacteria (they all contain chlorophyll) use sunlight, carbon
dioxide, and water to make food. Slide 4 Photosynthesis Chlorophyll
is the main pigment (molecule that absorbs light) used in
photosynthesis Chlorophyll is green in color and found in the
chloroplast. Carbon dioxide + water glucose + oxygen 6 CO2 + 6 H2O
+ light C6H12O6 + 6 O2 Slide 5 Glucose Glucose is a simple sugar
carbohydrate Plants store the suns energy in glucose, which will be
later used by the plants cells. Remember a plant makes its own food
exactly like your mom is cooking the food at home. Both the plant
and your mother need to eat this food later on in order to get the
energy they need Slide 6 Cellular respiration The process by which
cells use oxygen to produce energy from food Most complex
organisms, such as plants and animals, obtain energy through
cellular respiration C6H12O6 + 6 O2 6 CO2 + 6 H2O + energy (ATP)
Glucose + oxygen carbon dioxide + water Slide 7 Cellular
respiration takes place in: The cell membrane prokaryotic cells The
mitochondria eukaryotic cells Did you notice something?! The 2
equations are very similar.. Actually they are the same but just
the opposite !!! see figure 3 p 96 Slide 8 Fermentation The
breakdown of food without the use of oxygen Fermentation releases
less energy than cellular respiration Slide 9 2 types of
fermentation happen in: Your muscles in case of vigorous exercise
when the muscle cells cant get the oxygen they need for cellular
respiration. It produces lactic acid which builds up and
contributes to muscle fatigue and causes a burning sensation. It
happens also in the muscle cells of other animals and in some fungi
and bacteria Yeast and bacteria and it produces CO2
