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Photosynthesis
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Cells Using Biochemical Energy

Cells Using Biochemical Energy

Cells Use ATP For:

Active transport

Movement

Photosynthesis

Protein Synthesis

Cellular respiration

All other cellular reactions

Slide 14

More on ATP

More on ATP

Cells Have Enough ATP To Last For A Few Seconds

ATP must constantly be made

ATP Transfers Energy Very Well

ATP Is NOT Good At Energy Storage

Slide 15

Glucose

Glucose

Glucose is a monosaccharide

C6H12O6

One Molecule of glucose Stores 90 Times More Chemical Energy Than One Molecule of ATP

Slide 16

History of Photosynthesis & Plant Pigments

History of Photosynthesis & Plant Pigments

Slide 17

Photosynthesis

Photosynthesis

Involves the Use Of light Energy to convert Water (H20) and Carbon Dioxide (CO2) into Oxygen (O2) and High Energy Carbohydrates (sugars, e.g. Glucose) & Starches

Slide 18

Investigating Photosynthesis

Investigating Photosynthesis

Many Scientists Have Contributed To Understanding Photosynthesis

Early Research Focused On The Overall Process

Later Researchers Investigated The Detailed Chemical Pathways

Slide 19

Early Questions on Plants

Early Questions on Plants

Several Centuries Ago, The Question Was: Does the increase in mass of a plant come from the air? The soil? The Water?

Slide 20

Van Helmont’s Experiment 1643

Van Helmont’s Experiment 1643

Planted a seed into A pre-measured amount of soil and watered for 5 years

Weighed Plant & Soil. Plant Was 75 kg, Soil The Same.

Concluded Mass Came From Water

Slide 21

Priestley’s Experiment 1771

Priestley’s Experiment 1771

Burned Candle In Bell Jar Until It Went Out.

Placed Sprig Of Mint In Bell Jar For A Few Days.

Candle Could Be Relit And Burn.

Concluded Plants Released Substance (O2) Necessary For burning.

Slide 22

Ingenhousz’s Experiment 1779

Ingenhousz’s Experiment 1779

Repeated Priestly experiment with & without sunlight

Slide 23

Results of Ingenhousz’s Experiment

Results of Ingenhousz’s Experiment

Showed That Priestley’s Results Only Occurred In The Presence Of Sunlight.

Light Was Necessary For Plants To Produce The “Burning Gas” or oxygen

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