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Understanding Photosynthesis Part 3 : Role Of Chloroplast In Photosynthesis

Understanding Photosynthesis Part 3 : Role Of Chloroplast In Photosynthesis

Today, We are going to talk More On the role of chloroplast in photosynthesis.

in plants, the chloroplast is made up of an aqueous matrix called the stroma, surrounded by two lipid bilayer membranes(The outer and the inner membrane). These two bilayer membranes are separated from each other by a space called the intermembrane space. Inside of the stroma is found a network of thylakoid membranes within which chlorophyll and other photosynthetic pigments are embedded. Some of the thylakoids arrange themselves in stacks called the grana which are connected to each other by a stroma thylakoid.

Role of chloroplast in photosynthesis: It is at the chloroplast that both the light and the dark stage of photosynthesis occur, the light stage of the reaction takes place in the thylakoid, whereas the dark stage of the reaction takes place at the level of the stroma(The aqueous fluid surrounding the stacks of thylakoid.

In the light stage of photosynthesis, water is being oxidized to release oxygen and its energy electrons are transferred to ATP and NADPH. In the dark stage of the reaction, the energy from ATP and NADPH are used for carbon dioxide fixation(The binding of a molecule of carbon dioxide to a 6-5carbon molecule)

When a photon of light falls on the reaction center, chlorophyll will release an electron required for the formation of ATP and NADPH. However, the electron produced by the chlorophyll pigment is being prevented from escaping through the electron-hole by the water molecule. In order word, the electrons produced by the water molecule will fill up the electron-hole to prevent the escape of the chlorophyll electron through it.Keep in mind that the electron produce by the chlorophyll pigment will be use in the synthesis of ATP and NADPH.

It should be noted that ATP is not only formed as a result of the electron produced by the chlorophyll pigments. They can also be formed as a result of the enzyme called ATP synthase which actually initiates the synthesis of ATP from ADP by the combination of a phosphate group to the ADP. ADP+Phospahte +ATP SYNTHASE–>ATP

So in photosystem, the electron release by the chlorophyll pigment in phtosystem 2 will be accepted by ADP AND NADPH to produce ATP and NADPH in photosystem 2.

Photosystem constitutes different types of proteins which surround the pigment molecules responsible for the absorption of light. In photosystem 2 a photon of light will hit the chlorophyll pigment causing its electron to becomes excited which is later released. In photosystem 2, the excited released electron will be used in the synthesis of ATP and NADPH.

In conclusion,the role of chloroplast in photosynthesis is Vital

If you want to read more about photosynthesis, do not forget to check here.

Chapter 1 Chapter 2 Chapter 3 Chapter 4

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