Class 12 Biology Photosynthesis – Process, Factors & Importance of Photosynthesis

Photosynthesis is the process by which green plants prepare their own food using sunlight, carbon dioxide, and water. It is one of the most important biological processes because it provides food and oxygen for life on Earth.

This chapter is highly important for NEET and Class 12 Board Exams.

What is Photosynthesis?

Photosynthesis takes place in the chloroplasts of plant cells containing chlorophyll pigments. During this process, light energy is converted into chemical energy stored in the form of glucose.

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Stages of Photosynthesis

Light Reaction

The light reaction occurs in the thylakoid membranes of chloroplasts. It involves the absorption of sunlight and the production of ATP and NADPH.

Calvin Cycle

The Calvin Cycle takes place in the stroma of chloroplasts and uses ATP and NADPH to synthesize glucose from carbon dioxide.

Factors Affecting Photosynthesis

Light Intensity
Carbon Dioxide Concentration
Water Availability
Temperature
Chlorophyll Content

These factors directly influence the rate of photosynthesis.

Importance of Photosynthesis

Produces food for plants and animals.
Releases oxygen into the atmosphere.
Maintains the carbon cycle.
Supports life on Earth.
Provides the basis of all food chains.

Importance for NEET

Photosynthesis is a high-weightage chapter in Biology. Questions are frequently asked on light reactions, Calvin cycle, chloroplast structure, photosynthetic pigments, and factors affecting photosynthesis.

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