Question

What is photosynthesis

Answer 1

Answer:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities. 

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Answer 2

Answer:

Photosynthesis is the physicochemical pathway in which green plants synthesize organic food by using light energy.

Explanation:

• Plants are unique in driving photosynthesis, a biological process in which carbon dioxide with the help of water is reduced to carbohydrates by input solar energy.

Features of Photosynthesis:

• An endothermic reaction requires sunlight as an energy source
• A Redox process as the light reaction is an oxidation reaction (splitting of water occurs) and the dark reaction involves reduction i.e. CO₂ fixation
• An uphill process since CO₂ is a weak electron acceptor
• It is a Physicochemical process as a mechanism of photosynthesis to convert light energy into glucose i.e. conversion from physical form to chemical form

The overall process can be summarised as follows:

• Photosynthesis begins with the absorption of light energy by photosynthetic pigments called chlorophyll, located in membranous structures -thylakoids, in chloroplasts.

• The light energy absorbed by accessory pigments gets transferred to chlorophyll molecules for use in photosynthesis.
• The light energy is used to oxidize water later releasing oxygen. The electrons and protons produced undergoes a series of electron transport molecules and give NADPH and ATP.
• These NADPH and ATP formed then reduce CO₂ and convert it into carbohydrates by a sequence of biochemical reactions taking place in the stroma of chloroplasts.