Photosynthesis

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PHOTOSYNTHESIS

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Photosynthesis

Anabolic (small molecules combined)

Endergonic (stores energy)

Carbon dioxide (CO2) requiring process that uses light energy (photons) and water (H2O) to produce organic macromolecules (glucose).

6CO2 + 6H2O  C6H12O6 + 6O2

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Question:

Where does photosynthesis take place?

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Plants

Autotrophs – produce their own food (glucose)

Process called photosynthesis

Mainly occurs in the leaves:

a. stoma - pores

b. mesophyll cells

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Stomata (stoma)

Pores in a plant’s cuticle through which water vapor and gases (CO2 & O2) are exchanged between the plant and the atmosphere.

Found on the underside of leaves

Stoma

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Mesophyll Cell of Leaf

Photosynthesis occurs in these cells!

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Chloroplast

Organelle where photosynthesis takes place.

Thylakoid stacks are connected together

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Thylakoid

Grana make up the inner membrane

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Question:

Why are plants green?

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Chlorophyll Molecules

Located in the thylakoid membranes

Chlorophyll have Mg+ in the center

Chlorophyll pigments harvest energy (photons) by absorbing certain wavelengths (blue-420 nm and red-660 nm are most important)

Plants are green because the green wavelength is reflected, not absorbed.

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Wavelength of Light (nm)

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Absorption of Light by Chlorophyll

wavelength

Absorption

Chlorophyll absorbs blue-violet & red light best

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Question: