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Essential Concepts: Photosynthesis in Plants

Discover the key processes of photosynthesis in plants, from capturing sunlight to producing sugars. Explore the roles of chlorophyll, chloroplasts, and the light-dependent and light-independent reactions. Watch video clips for a visual explanation.

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Essential Concepts: Photosynthesis in Plants

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Presentation Transcript

  1. KEY CONCEPTThe overall process of photosynthesis produces sugars that store chemical energy.

  2. Photosynthetic organisms are producers. • Producers make their own source of chemical energy. • Plants use photosynthesis and are producers. • Photosynthesis captures energy from sunlight to make sugars. • Plants absorb visible light for photosynthesis

  3. chloroplast leaf cell leaf • Chlorophyll is a molecule that absorbs light energy. • Two main types of • chlorophyll: chlorophyll a & • chlorophyll b • Together, these 2 types • absorb mostly red & blue • wavelengths of visible light • In plants, chlorophyll is found in organelles called chloroplasts. • The green color of plants is • due to the reflection of • light’s green wavelengths

  4. Video Clip: Photosynthesis

  5. grana (thylakoids) chloroplast stroma Photosynthesis in plants occurs in chloroplasts. • Photosynthesis takes place in two parts of chloroplasts. • grana ( stacks of thylakoids) • Stroma (fluid that surrounds the grana inside a chloroplast)

  6. The light-dependent reactions capture energy from sunlight. • take place in thylakoids • water and sunlight are needed • chlorophyll absorbs energy • energy is transferred along thylakoid membrane then to light-independent reactions • oxygen is released

  7. Video Clip: Oxygen & Green Plants

  8. Light Rxns & ETC

  9. The light-independent reactions make sugars. • take place in stroma • needs carbon dioxide from atmosphere • use energy to build a sugar in a cycle of chemical reactions (Fig. 2.2  pg. 98)

  10. Video Clip: Dark Reactions

  11. granum (stack of thylakoids) 1 chloroplast sunlight 6H2O 6O2 2 energy thylakoid stroma (fluid outside the thylakoids) 6CO2 1 six-carbon sugar C6H12O6 3 4 • The equation for the overall process is: 6CO2 + 6H2O  C6H12O6 + 6O2

  12. Summarization of Light & Dark Rxns

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