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Presentation on theme: "PHOTOSYNTHESIS."— Presentation transcript:


2 I. Autotrophs and Heterotrophs
Energy for living things comes from the SUN Autotrophs- make their own food Ex: plants, some bacteria, protists

3 Heterotrophs- obtain it from the foods they consume
Ex: animals, some bacteria, protozoans (and even fungi!)

4 Sooo… food is either MADE through photosynthesis or OBTAINED through consumption

5 Think about the Location of Photosynthesis…

6 II. Location of Photosynthesis Which tissues contain chloroplasts?

7 Other Important Parts Xylem: transports H2O
Stoma: pore that allows gases to enter and exit

Double-membrane structure Internal Organization 1. Thylakoids: a. These have clusters of chlorophyll and other pigments 2. Stroma: Fluid surrounding thylakoids

9 IV. Light & Pigments A. Sunlight is “white” but contains mixtures of visible wavelengths B. Plants gather sun’s energy using light-absorbing molecules called PIGMENTS

10 V. Plant Pigments MAJOR MINOR Chlorophyll a Chlorophyll b Xanthophyll
Absorbs all colors of light except green Plays major role in light reactions of photosynthesis Chlorophyll b Yellow-green Xanthophyll In carotenoid family Yellow Carotene Red & orange pigments MAJOR MINOR

11 B. Visible energy spans wavelengths of approx. nm C. It is part of the electromagnetic spectrum

12 Green is NOT absorbed! Plant pigments absorb different wavelengths of energy- which wavelength is the LEAST absorbed?

13 1. Leaves absorb blue-violet & red-orange light very well 2
1. Leaves absorb blue-violet & red-orange light very well 2. Green light is REFLECTED which is why plants look green!

14 VI. PHOTOSYNTHESIS Inputs: Light, carbon dioxide, & water
Outputs: sugar and oxygen

15 VI. Photosynthesis Has Two Parts:
Light Reaction Calvin Cycle

16 VII. Light Reaction Chlorophyll capture light energy in chloroplast
This splits H2O into oxygen and hydrogen Oxygen is a "waste product" & escapes to the atmosphere Energy from the reaction is used in the next stage.

17 B. ATP and NADP are recycled back into
the system C. Light reaction is charging up the “battery” needed to make sugars in Calvin Cycle

18 IX. Calvin Cycle Does NOT use light at all
Uses energy from Light Cycle to convert CO2 into glucose

19 Reactants: Products:

20 Two Processes Calvin Cycle Light Reaction

21 Factors Affecting Photosynthesis
Shortage of raw materials Temperature Light intensity

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