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The Leaf and Photosynthesis

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·bonds made, storing energy
PHOTOSYNTHESIS ·process where energy from sunlight (“photo”) is used to make (“synthesis”) food (glucose, a carbohydrate) ·light energy chemical energy ·bonds made, storing energy

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What kind of reaction is this?
Photosynthesis equation: carbon dioxide water glucose oxygen + sunlight chlorophyll HIGH ENERGY LOW ENERGY What kind of reaction is this?

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What parts of the plant are involved in the reaction?
carbon dioxide water glucose oxygen + sunlight chlorophyll 6 CO2 C6H12O6 + 6 O2 + 6 H2O from air via stomata in leaves from soil via roots stored as starch in leaves released to air via stomata in leaves

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Where in the plant cell does this process occur?

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Contain green photoreceptor pigment, chlorophyll.
Chloroplasts Contain green photoreceptor pigment, chlorophyll. Found in the ground tissue of leaves and stems. The site of photosynthesis

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Chloroplasts Photosynthesis mainly happens in the leaves of plants.
What 4 things does a leaf need to perform photosynthesis? Sunlight, water, CO2, chlorophyll Chloroplasts are a membrane bound organelle that carries out photosynthesis. Sunlight, water, co2, chlorophyll

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Chloroplasts Found in leaves, and unripened fruit.
These are the only areas that can perform photosynthesis. Has an outer and an inner membrane that hold the chloroplast together.

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Chloroplasts The medium inside the chloroplast is called the stroma.
The stroma is filled with proteins, and is a very thick almost solid liquid.

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Cytoplasmic Streaming
·Movement of the cytoplasm and its contents ·Circulates materials throughout the cell ·First seen by Robert Hooke ·Chloroplasts move this way in reaction to light

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Let’s examine the special conditions required for the photosynthesis reaction:

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Is chlorophyll sensitive to all the colours of the spectrum?
LIGHT ENERGY AND PHOTOSYNTHESIS Light energy travels in waves. Sunlight is white light, which is a combination of all the colours of the rainbow. The different colours are: Red Orange Yellow Green Blue Indigo Violet Is chlorophyll sensitive to all the colours of the spectrum?

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Chlorophyll absorbs energy from the blue and red regions of the light spectrum, and reflect (absorb almost none) of the yellow and green light

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How is the leaf perfectly designed to maximize exposure to light?
Where exactly is the light reaction occurring?

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Photosynthesis Photosynthesis can be broken down into two separate reactions Light reaction Energy and oxygen are made in this reaction Dark reaction Glucose is made in this reaction

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·What kind of reaction is cellular respiration?
·For energy that cells can use to function ·Energy released by breaking bonds ·Occurs in both cytoplasm and mitochondria C6H12O6(aq) + 6O2(g) 6CO2(g) + 6H2O(l) ·What kind of reaction is cellular respiration? The inner membrane is the site of many cell resp reactions – why is it so folded?

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Comparing Photosynthesis and Cellular Respiration

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