Photosynthesis

PHOTOSYNTHESI S It is a photo biochemical process in which energy rich compounds such as carbohydrates are synthesized from simple in organic compounds

REACTION OF PHOTOSYNTHESIS

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6CO2 + 6H2O

(CARBON DIOXIE)

12H2O (WATER)

chlorophyll LIGHT

C6H12O6 + (GLUCOSE)

6O2 +

(OXYGEN)

TWO STEPS OF PHOTOSYNTHESIS  1.

Light Reaction  2. Dark Reaction

STEPS OF LIGHT REACTION • • • •

Two photo systems work in a coordinated manner. Light energy is converted into chemical energy. The end products are ATP and NADPH2. As a result of photolysis of water oxygen is evolved as a by product.

STEPS OF DARK REACTION 1. Dark reaction requires no light 2. No liberation of oxygen. 3. It takes place in the stroma of chloroplasts. 4. The energy rich compounds are used to produce the organic compounds.

FACTORS AFFECTING PHOTOSYNTHESIS External Factors:-

Internal Factors:

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1. Light 2. CO2 3. 4. 5.

Water Temperature Oxygen

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1. Chlorophyll contents 2. Accumulation of products 3. structure of leaves

SINGNIFICANCE OF PHOTOSYNTHESIS 

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1. All life of universe depends upon the plants for their food. 2. Only plants are able to convert light energy of sun in the form of chemical energy 3. Oxygen is evolved during photo-

Aastha Kalia(10th class) Daljeet Kaur(10th Class) Vandana(10th Class)