chithra photosynthesis 2

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Page 1: Chithra photosynthesis 2
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Name : Chithra M LOption : Natural ScienceReg No : 18114341004

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Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar. Plants use glucose as food for energy and as a building block for growing.Autotrophs make glucose and heterotrophs are consumers of it.

Photo-synthesisPhoto-synthesismeansmeans "putting together with light.""putting together with light."

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• Autotrophic Process: Plants and plant-like organisms make their energy (glucose) from sunlight.

• Stored as carbohydrate in their bodies.• 6CO2 + 6H2O + sunlight C6H12O6 + 6O2

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Carbon dioxide + water glucose + oxygensunlightsunlight

absorbed by chlorophyllabsorbed by chlorophyll

66COCO22 + + 66HH22O + energy O + energy C C66HH1212OO66 + + 66OO22

As can be seen from the equation for photosynthesis, the wood, bark, and root came from water and carbon dioxide.

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Why is Photosynthesis important?

Makes organic molecules (glucose) out of inorganic materials (carbon dioxide and water).It begins all food chains/webs. Thus all life is supported by this process.It also makes oxygen gas!!

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Plants in Action

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PlantsLeaves are green

because they contain

the pigment:


Leaves have a Leaves have a large surface area large surface area to absorb as much to absorb as much light as possiblelight as possible "Thanks for the Glucose!""Thanks for the Glucose!"

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PHOTOSYNTHESIS• Absorbing Light Energy to make chemical

energy: glucose!• Pigments: Absorb different colors of white light

• Main pigment: Chlorophyll a• Accessory pigments: Chlorophyll b and Carotenoids• These pigments absorb all wavelengths (light) BUT


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• Light-dependent reaction• Light-independent reaction

• Light-dependent: converts light energy into chemical energy; produces ATP molecules to be used to fuel light-independent reaction

• Light-independent: uses ATP produced to make simple sugars.

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