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Announcements. Start new unit Photosynthesis and cellular respiration Describe the four levels of organization? What color are most plants? Why is that?. Photosynthesis. Ch 8-1 Ch 8-2. Photosynthesis.

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Announcements

Announcements

  • Start new unit

    • Photosynthesis and cellular respiration

  • Describe the four levels of organization?

  • What color are most plants? Why is that?


Photosynthesis

Photosynthesis

Ch 8-1

Ch 8-2


Photosynthesis1

Photosynthesis

  • When I plant a seed that weighs 1 gram, how does it grow into a huge sequioa tree which weighs tons?

  • Where does the extra weight come from? The soil? The water?

  • Dutch Physician Jan Van Helmont

    • Soil weighed constantly 75 grams

    • Water was the only thing he added

  • Joseph Priestley

    • Observed a plant keep a flame alive underneath a glass dome

    • Jan Ingenhousz figured out that plants produce oxygen in light

  • Photosynthesis

    • Plants convert the energy of sunlight into the energy in the chemical bonds of carbohydrates


Requirements for photosynthesis

Requirements for Photosynthesis

  • Sunlight – different wavelengths of visible light are needed for photosynthesis

    • Autotrophs – organisms that can make their own source of food. Ex. Plants

    • Heterotroph – organisms that obtain energy from another source. Ex. People

  • Pigments – absorb the specific wavelengths (colors) from light

    • Chlorophyll is the primary pigment in plants.

  • Energy storing compounds

    • ATP (adenosine triphosphate) – power currency of the cell


Requirements for photosynthesis1

Requirements for Photosynthesis


Announcements

ATP

Section 8-1

Adenine

Ribose

3 Phosphate groups

Go to Section:


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Figure 8-3 Comparison of ADP and ATP to a Battery

Section 8-1

ADP

ATP

Energy

Energy

Adenosine diphosphate (ADP) + Phosphate

Adenosine triphosphate (ATP)

Partially

charged

battery

Fully

charged

battery

Go to Section:


Announcements

Figure 8-3 Comparison of ADP and ATP to a Battery

Section 8-1

ADP

ATP

Energy

Energy

Adenosine diphosphate (ADP) + Phosphate

Adenosine triphosphate (ATP)

Partially

charged

battery

Fully

charged

battery

Go to Section:


Announcements

“Simplified” EQUATIONFORPHOTOSYNTHESIS

Energy (Light)

6CO2 +

6H2O +

C6H12O6 +

6O2

CARBON DIOXIDE

GLUCOSE

OXYGEN

WATER


Announcements

Photosynthesis

+

H2O

CO2

Energy

ATP and

NADPH2

Water is

broken

Light is Adsorbed

By

Chlorophyll

ADP

NADP

Calvin Cycle

Chloroplast

Used Energy and is recycled.

O2

+

C6H12O6

Light Reaction

Dark Reaction


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