Curriculum
Science — Second Preparatory
Unit 1: Matter and Energy
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Unit 2: Matter and Chemical Reactions
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Unit 3: Energy Flow in Photosynthesis and Respiration
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Unit 4: Geological Processes
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Text lesson
Photosynthesis
Photosynthesis
Where it happens and the role of chlorophyll
Where it happens and the role of chlorophyll
- Photosynthesis takes place in the green chloroplasts inside the cells of the leaf, especially the cells of the middle tissue (mesophyll).
- The chloroplasts contain the green pigment chlorophyll, which absorbs light energy, mainly red and blue light.
- It reflects green light, which is why leaves look green.
- Gases enter and leave the leaf through the stomata, which are small openings in the leaf surface.
- Carbon dioxide enters through the stomata and oxygen leaves through them.
- Water moves from the roots to the leaves through the xylem vessels.
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