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Science 10

Science 10. Aim: What are the plant structures, and what are some specialization in plant cells. Agenda. Science Sizzler. Plant Notes continued Quiz rewrite today last chance after school Worksheets due today if you want the marks (instead of 0) on your report card.

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Science 10

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  1. Science 10 • Aim: What are the plant structures, and what are some specialization in plant cells.

  2. Agenda • Science Sizzler. • Plant Notes continued • Quiz rewrite today last chance after school • Worksheets due today if you want the marks (instead of 0) on your report card. • Chem rewrite on Tuesday at lunch. • Bring Pizza Supplies for Tuesday

  3. The leaf tissue and gas exchange Dermal Tissue • Epidermis is on both the top and underside of the leaf. • It is clear and very thin. • Guard cells in epidermis control the opening and closing of stomata that allow gas exchange to happen.

  4. It is not efficient for stomata to remain open at all times. • Guard cells swell up to open stomata, and shrink to close stomata. • Sunlight causes guard cells to actively uptake K ions, which results in the uptake of water through osmosis. • Under increased turgor pressure, the stoma opens.

  5. Guard cells protect the leaves from losing to much water. • The process of water vapour leaving the leaf through the stomata is called transpiration. • The number of stomata in plants is dependent on the environment.

  6. Ground Tissue • Between the upper and lower epidermis is the ground tissue mesophyll. • Mesophyll is broken into two types • Palisade tissue cells • Spongy mesophyll tissue

  7. Palisade tissue cells: • Found just below the upper epidermis. • Long, rigid, rectangular cells that are tightly packed together. • They are exposed to the Sun’s rays. • Responsible for photosynthesis, therefore many chloroplasts. • Require carbon dioxide, and release oxygen

  8. Spongy mesophyll tissue • Between the palisade tissue cells and the lower epidermis. • Loosely packed, irregularly shaped, less rigid cells. • Main function: gas exchange by diffusion throughout the leaf. • Moves oxygen towards stomata to be released, moves carbon dioxide towards palisade cells.

  9. Vascular Tissue • Provides leaf with water needed for transpiration and photosynthesis. • The ribs in a leaf, known as leaf veins, contain the vascular tissue of the leaf

  10. The xylem and phloem tissues are bunched together like a handful of straws in a vascular bundle • Xylem is responsible for water and dissolved salts from the roots to the leaves. • Phloem responsible for transporting produced sugars to the rest of the plant from the leaves.

  11. Gas Exchange in Plants • All gas exchange in plants occurs through diffusion. • No organ specifically concerned with gas exchange • Gases diffuse though air spaces then across the membrane • The leaves not the only place gas exchange occurs

  12. The stems of trees and herbaceous plants may have what appear to be blisters or slashes. • These are natural openings, or pores, that are called lenticels that provide an opening for gas exchange.

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