Question

Differentiate between photorespiration and phosphorylation.

Answer 1

Answer:

Respiration Photorespiration

It occurs in all living cells. It occurs only inside photosynthetic cells.

It continues in both dark and light. It takes place only in the presence of light.

It occurs in all organisms. It occurs in C

3

plants and negligible in C

4

plants.

Exchange of gases is not dependent on light. Exchange of gases are light dependent.

It is not affected by change in oxygen concentration between 10-25%. Beyond it there is a decline in the rate of respiration. It increases with the the increase in oxygen concentration.

It takes place in cytoplasm and mitochondria. It takes place in chloroplasts and may require the help of perioxisomes and mitochondria.

Glucose is used as substrate for respiration. RuBP is used as substrate for photorespiration.

CO

2

and water are end products. CO

2

and PGA are end products.

The end products are not recycled in respiration. Both the end products are reutilized in photosynthesis.

It is an useful process as it produces energy.

Answer 2

The difference between them are explained as
Explanation:
1. Photo respiration is completely a
wasteful process while
phosphorylation is a useful
process.
2. No food synthesis take place in
photorespiration and simultaneously
carbon dioxide is released in photo
respiration.
3. ATP molecules are synthesized in
the phosphorylation.
4. Photo respiration occurs in
peroxisome, mitochondria and
chloroplast while phosphorylation
take place in cytoplasmcell