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Primary Plant Metabolites

 Carbohydrates, proteins, nucleic acids and lipids are considered as the main primary metabolites.
Functions of primary metabolic compounds.
Polysaccharides are mainly used in providing support for plants and also stores energy for their later use.
A protein builds the remaining biomass of living plant cells.
A protein consists of polypeptides, which are made up of amino acids. 
Plants synthesize amino acids from the products of photosynthesis by using large amounts of energy in the form of   ATP and NADPH.
A protein stores energy in seeds and are used as a source of nutrition in the early development of seedlings. For example: Corn produces a storage protein called ZEIN.  

Photosynthesis

Plants depend on photosynthesis to obtain their energy. In plant cells, the presence of chlorophyll pigment helps to carry out the photosynthetic reaction. Photosynthesis is the process, which occurs in all green plants. The main role of photosynthesis is to trap solar energy and use this energy to drive the synthesis of carbohydrates from carbon dioxide. An equation for photosynthetic reaction is

6CO2 + 6H2O + sunlight à C6H12O6 + 6O2 

Photosynthesis is a biological process, which is carried out in two steps.

Light-dependent reaction (or) Light reaction
In this biochemical process, light energy is converted into chemical energy and ATP molecules are produced. 
This process requires light and occurs in thylakoids in chloroplast cells.
There is a loss of energy along the electron transport chain to recharge ATP from ADP.

Light-independent reaction (or) Dark reaction
In this biochemical process, produced ATP molecules are used to convert them into simple sugars.
This process does not require light and occurs in the stroma of chloroplast cells.
In this process, ATP and NADPH are used to produce energy.
Prepares glucose sugar from carbon dioxide and Hydrogen
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