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Leaf Cross Section

Leaf Cross Section. Cuticle – prevents water loss Epidermis – prevents water loss, “skin” of the leaf Palisade cells – tall and skinny photosynthetic cells Spongy cells – shaped to trap CO 2 Chloroplasts – site of photosynthesis Vein – transports sugar and water

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Leaf Cross Section

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  1. Leaf Cross Section

  2. Cuticle – prevents water loss Epidermis – prevents water loss, “skin” of the leaf Palisade cells – tall and skinny photosynthetic cells Spongy cells – shaped to trap CO2 Chloroplasts – site of photosynthesis Vein – transports sugar and water Stomata – opening that permits gas exchange; maintains homeostasis Guard cells – open and close stoma Leaf Cross Section

  3. Leaf Cross Section

  4. Structure Aids Function Most leaves are thin to allow sunlight to penetrate the entire leaf, and wide to capture as much sunlight as possible.

  5. Chloroplast Structure The parts of a chloroplast are: 1.Thylakoids - saclike photosynthetic membranes 2.Grana - stack of thylakoids 3.Stroma – fluid filled space outside of thylakoids

  6. Chloroplast

  7. The Reactions of Photosynthesis • Light Dependant Reactions: • Takes place in the thylakoids • Requires light • Produces Oxygen and Adenosine Triphosphate

  8. The Reactions of Photosynthesis • Calvin Cycle • Takes place in the stroma • Also called the light independant reaction • Uses ATP from the light dependent reactions • Produces sugar or glucose.

  9. Cellular Respiration vs. Photosynthesis

  10. Leaf Cross Section • Find and draw a palisade, spongy and guard cell. • Drawn under high power • Label : chloroplasts, cell wall • Identify what type of cell is being drawn __________X Type of cell

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