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Understanding Photosynthesis

Discover the process of photosynthesis, how it converts radiant energy into chemical energy, and its importance for plants, animals, and humans. Learn about the stages, products, and factors that affect photosynthesis.

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Understanding Photosynthesis

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  1. Understanding Photosynthesis AgEdNet.com Crop Science Library

  2. Photosynthesis makes plants unique … • It’s the basic reaction that sustains all life. • Converts the sun’s radiant energy into a usable chemical energy form for plants, animals and humans • Comes from “photo” (light) + “synthesis” (to put together) • The original source of fuels like oil, coal, wood, natural gas

  3. Plant photosystem … • Photosynthetic chemical activity takes place within plant organelles called chloroplasts. • Chloroplasts are present in leaves, green stems and unripe fruit. • Photosynthesis can only take place when chlorophyll is present in the chloroplasts. • Chlorophyll is the green coloring matter of leaves and plants, it is essential to the production of carbohydrates by photosynthesis

  4. Changing Radiant energy to chemical energy … • Plants transform energy from the sun into chemical energy which can be transported and stored in plants. • Photosynthesis "fixes" carbon (from carbon dioxide in the atmosphere) into a solid form. • Photosynthesis produces oxygen as an important byproduct. • The major energy-yielding chemical produced by photosynthesis is glucose – a sugar or carbohydrate.

  5. Photosynthesis requires: • Living, healthy plant • Carbon dioxide (CO2) from the atmosphere • Water (H2O) from the soil or atmosphere • Radiant Energy, usually from the sun CO2

  6. What is produced by photosynthesis? • Basic reaction: carbon dioxide (CO2) from the atmosphere plus water combine, in the presence of a radiant energy and chlorophyll, to form sugar (C6H12O6) and oxygen (O2). • Gasses are exchanged through the Stomata, small slits in the leaves and stems. • An estimated 620 billion tons of carbon are removed from the air by plants annually. • Photosynthesis is the primary source of oxygen worldwide. • What plant specifically produces the most O2?

  7. Stages of photosynthesis: • The light reaction converts energy and releases oxygen. • The dark reaction takes in carbon from carbon dioxide, adds hydrogen, and forms carbohydrates using energy from the light reaction.

  8. Products of photosynthesis: • Glucose converted to energy or other biochemicals including: • Sucrose • Starch – stored in plant cells, seeds, roots • Cellulose – used for plant walls • Fats and oils often stored in seeds • Combined with nitrogen and sulfur to form amino acids and then proteins

  9. Factors affecting photosynthesis: • Light quality • Light intensity • Light duration • Carbon dioxide concentration • Temperature • Water availability

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