Difference between photorespiration and photophosphorylation


These such topics are very hard for you to find on the internet but still there is this curiosity to know and when you don't have enough time blogs are the only way to help you out of this situation. So, without wasting any time I shall start with 5 difference between photorespiration and photophosphorylation. Even if you don't know what these mean I shall also explain it to you in brief so keep reading.

Difference between photorespiration and photophosphorylation:

For better understanding here is a table showing you 5 differences between photorespiration and photophosphorylation:


Photorespiration Photophosphorylation
1. Photorespiration means the process of respiration which takes place where carbon dioxide is given out which is the opposite process of photosynthesis. When ADP is phosphorylated to ATP by the help of the energy coming from the sunlight is called photophosphorylation.
2. Photorespiration occurs during celluar respiration Photophosphorylation takes place during the process of photosynthesis
3. Photorespiration takes place insdie mitochondria, peroxisomes, chloroplast and cytoplasm. Photophosphorylation takes place in the the thylakoids.
4. Energy source for photorespiration is glucose. Energy source for photophosphorylation is ligt.
5. The electron acceptor in photorespiration is molecular oxygen. The electron acceptor in photophosphorylation is NADP+

What is photorespiration ?

Photorespiration means the process of respiration which takes place where carbon dioxide is given out which is the opposite process of photosynthesis. The enzyme RuBisCo oxygenates RuBP wasting the energy which was produced by photosynthesis. It obstructs the process of photosynthesis.

If you want to know the dual nature of the enzyme RuBisCo click here.

 Process of photorespiration
Process of photorespiration

What is photophosphorylation ?

When ADP is phosphorylated to ATP by the help of the energy coming from the sunlight is called photophosphorylation. This process commonly occurs during the process of photosynthesis. We know that there are energy acceptors and donors. In this process the light energy is created to high energy electron donor and on the other hand there is a lower energy electron acceptor. Photophosphorylation is of two types, which are as follows:
  1. Cyclic photophosphorylation - An electron is expelled from the reaction centre. If that electron passes through the given electron barriers and comes back to same reaction centre is called cyclic photophosphorylation
    Cyclic photophosphorylation
  2. Non-cyclic photophosphorylation - The electron which is expelled from the reaction centre but does not come back to the same reaction centre is called non-cyclic photophosphorylation
    Non-cyclic photophosphorylation

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