ICSE Class 10 Chapter Biology Chapter 6 Photosynthesis Revision Notes
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The process by which green plants are able to synthesize food from carbon
dioxide and water, in the presence of chlorophyll and light energy.
Photolysis of water: Chemical decomposition of water induced by light or other radiant energy. Photolysis plays an important role in photosynthesis, during which it produces energy by splitting water molecules into gaseous oxygen and hydrogen ions.
Biosynthetic phase: The process by which carbon dioxide is reduced to carbohydrates and the process is termed as carbon fixation. It makes use of adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH) produced in the light phase. This process occurs in the stroma of chloroplasts with the help of a series of enzyme-catalysed reactions.
Photophosphorylation: In the process of photosynthesis, the phosphorylation of ADP to form ATP using the energy of sunlight is called autophosphorylation.
- In photosynthesis, the energy from sunlight is used to convert carbon dioxide into sugar and oxygen is the by-product. It can be represented by the following equation:
6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O (in the presence of sunlight and
- Plants also respire by taking in oxygen and giving out carbon dioxide. In respiration, gaseous exchange occurs. Hence respiration and photosynthesis are opposite processes.
- Photosynthesis not only provides all living beings with food; it also maintains oxygen levels in the atmosphere. Therefore, you can say photosynthesis is the process that supports life on earth.
- Chlorophyll is a photosynthetic substance that is able to trap sunlight and use it to generate sugars (nutrition). It is found in plants, algae, chloroplasts and cyanobacteria (thylakoids).
- It is made of four kinds of pigments namely chlorophyll a, chlorophyll b, carotene, and xanthophyll.
- It also gives the green colour to the chloroplast and to the plant in general. Leaves appear green in colour because chlorophyll reflects green light and absorbs all other wavelengths of light.