Photosynthesis is the process by which plants, algae, and cyanobacteria use sunlight, carbon dioxide, and water to produce oxygen and energy in the form of glucose. It occurs in two stages - the light reaction phase which is dependent on light, and the dark phase or Calvin cycle which is light independent. The main pigments used in photosynthesis are chlorophyll a and b, which absorb light and reflect green light, giving leaves their green color, and carotenoids which also absorb light. Photosynthesis provides nutrients and oxygen for other organisms.

1. PHOTOSYNTHESIS
UNIT-6

2. WHAT IS PHOTOSYNTHESIS?
• The process that occurs in green plants, whereby
solar energy is converted into chemical energy and
stored as organic molecules by making use of
carbon dioxide, sunlight and water.
• WHO OR WHAT CAN PHOTOSYNTHSIZE?
1. Photoautotrophs can photosynthesize.
2. Include: green plants, algae, cyanobacteria and
green protists

3. RAW MATERIALS OF
PHOTOSYTHESIS?
Carbon dioxide,
Sunlight and
Water.
WHY DO PLANTS PHOTOSYNTHESIS?
To provide nutrients and oxygen for heterotrophs
are dependents, because they cannot produce
there own food.

4. PHOTOSYNTHESIS CONSIST OF 2
STAGES:
LIGHT REACTION PHASE DARK PHASE/CALVIN CYCLE
• Dependent on light • Light independent

5. WHERE PHOTOSYNTHESIS OCCUR?

6. THE PROCESS OF PHOTOSYNTHESIS

7. MAIN PIGMENTS USED DURING
PHOTOSYNTHESIS
Chlorophyll a- Absorb violet, blue and red light.
Reflects and transmits green light (that is why plant
leaves appear green).
Chlorophyll b- Absorb violet, blue and red light.
Reflects and transmits green light (that is why plant
leaves appear green).
Carotenoids- Play an accessory role in
photosynthesis. They are shades of yellow and
orange are able to absorb light in the violet- blue-
green range. There pigments became noticeable in
the fall when chlorophyll breaks don.

8. END

9. LIST OF REFERENCES
• Hill, R. (May 1999). "Oxygen Produced by Isolated
Chloroplasts". Proceedings of the Royal Society of
London. Series B, Biological Sciences 127 (847): 192–
210
• www.emc.maricopa.edu/faculty/farabee/biobk/bi
obookps.htmlCached - Similar.