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Calvin cycle

This cycle will be discussed in four simple steps to better understand the process

Step 1
Carbon (iv) oxide also known as carbondioxide will react with a five carbon sugar (pentose)  called Ribulose bisphosphate. The pentose sugar is a carbon (iv) oxide acceptor. A six carbon sugar is formed.

Step 2
The six carbon product is unstable and breaksdown immediately to two molecules of phosphoglyceric acid (3-carbon acid).

Step 3
The phosphoglyceric acid (PGA) is reduced by NADP and energy is supplied by ATP. The new product is a three carbon sugar triose phosphate. This is the first carbohydrate made in photosynthesis.

Step 4
Through a series of intermediate reactions triose phosphate will build up to a six carbon sugar which is converted to starch for storage.

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