The Leaf and Photosynthesis http dendro cnre vt

The Leaf and Photosynthesis http: //dendro. cnre. vt. edu/forestbiology/photosynthesis. swf

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

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

What parts of the plant are involved in the reaction? sunlight carbon + dioxide water 6 CO 2 + 6 H 2 O from air via stomata in leaves from soil via roots chlorophyll glucose + oxygen C 6 H 12 O 6 stored as starch in leaves + 6 O 2 released to air via stomata in leaves

Where in the plant cell does this process occur?

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

Chloroplasts • Photosynthesis mainly happens in the leaves of plants. • What 4 things does a leaf need to perform photosynthesis? • Sunlight, water, CO 2, chlorophyll • Chloroplasts are a membrane bound organelle that carries out photosynthesis.

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.

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

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 http: //www. youtube. com/watch? v=8 edk 6 n. GMw. Ms

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

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 Is chlorophyll sensitive to all the colours of the spectrum? Green Blue Indigo Violet

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

How is the leaf perfectly designed to maximize exposure to light? Where exactly is the light reaction occurring? http: //www. fw. vt. edu/dendro/forestbiology/photosynthesis. swf

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

Cellular Respiration ·For energy that cells can use to function ·Energy released by breaking bonds ·Occurs in both cytoplasm and mitochondria C 6 H 12 O 6(aq) + 6 O 2(g) 6 CO 2(g) + 6 H 2 O(l) ·What kind of reaction is cellular respiration? The inner membrane is the site of many cell resp reactions - why is it so folded?

Comparing Photosynthesis and Cellular Respiration