Photosynthesis vs.

Cellular Respiration

Ms. Liu

Biology

2/9/12

Cellular Respiration• How animal AND plant cells obtain energy:

ATP

Cellular RespirationWhat happens?

• We eat food which contains sugar (glucose) and…..it goes into our cells

• Glucose = the simplest sugar– It’s in ALL foods that we eat and some drinks– Breaking down of glucose Glycolysis

Photosynthesis

Cellular Respiration

• Animal cells have special organelle called: MITOCHONDRIA– It’s a “Power house” of the cell and where

glucose is broken down to make ATP

Cellular Respiration

• ATP = Adenosine Triphophate–A form of usable energy that ALL

living things need

Cellular Respiration

EQUATION:

Glucose + Oxygen CO2 + Water + ATP

(Reactants) (Products)

Photosynthesis

• Occurs in PLANT cells only.

• How they make sugar glucose

Photosynthesis

How does photosynthesis occur?

• Need sunlight, water, and carbon dioxide

Photosynthesis

• These components are then transformed into sugar (glucose) in the CHLOROPLAST– A special green organelle in plant cells only

Photosynthesis• A pigment called: CHLOROPHYLL

Captures sunlight

energy

Photosynthesis

• EQUATION:

Light + Water + CO2 Sugar + oxygen

(Reactants) (Products)

So then how do plants get energy, or ATP?

They use cellular respiration too… but after photosynthesis!!!

Bellringer

• Start on “Photosynthesis Riddles”:

– Answer 2 questions– 5 min

EXTRA Credit

• Create comic strip (5 boxes) explaining:

– Photosynthesis OR

– Endothermic and exothermic reactions

• Due on day of test (Wednesday next week)