Tuesday, November 15, 2011

How are our Body's Needs Connected to Plants?

Photosynthesis captures light energy from the sun to make sugar that stores chemical energy.
Autotrophs make their own food, plants.



It involves 2 stages:
The Light Dependent Reaction
and the The Light Independent Reaction.
Thylakoids are saclike photosynthetic membranes.
Grana is stacks of Thylakoids.
Stroma is the liquid surrounding grana (cytoplasm of chloroplasts).

The Light Dependent Reactions occur in the chloroplasts in the thylakoids.
The Light Independent Reactions happens in the stroma.

In the Light Dependent Reactions-
chlorophyll absorbs sunlight
electrons become excited.
Lost energy from electrons is used to create small amounts of ATP as well as Splitting Water.
Products-  O2, small amount of ATP, and NADPH
Reactants- Water is a reactant which is needed to release oxygen as a product.

In the Light Independent Reactions-
Also known as Dark Reactions or the Calvin Cylce.
Electrons bounce down an electron transport chain until it reaches NADP+, an electron carrier, ( like a bus) that will be used to carry the electrons to the stroma and carry out the light.
A set of chemical reactions that use CO2 and the energy carried by ATP and NADPH to make simple sugars.
Products- Oxygen, ADP, and NADP+
Reactants- ATP, NADPH, and Carbon Dioxide
Light Dependent and Independent Reactions work together to capture energy of sunlight and transform it into energy- rich compounds such as Carbohydrates.



Electron Transport Chain-
Makes the most ATP.
1 glucose molecule makes 38 ATP molecules.
This is the fuel the plant uses.

Reactants of Photosynthesis:
Carbon Dioxide  and Water

Products of Photosynthesis:
Sugar and Oxygen Gas(water splits in oxygen)

The Goal of Photosynthesis is to not make ATP. Its goal is to make glucose.

Animal Cells are dependent on plant cells because plant make their own food and animals do not. So to get food and energy animals must consume plants to intake the energy. Food indirectly gives us energy.

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