Plant Leaves + Tropisms

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10 Terms

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Leaves

  • Chloroplast : Where photosynthesis takes place, found in the mesophyll layer

    • Carbon Dioxide + water + sun’s energy → sugar + oxygen

  • Stomata and Guard Cells : Guard Cells control the passage of gases into and out of the leaves through an opening in the dermal tissue (stomata)

  • Vascular Bundles : Xylem and Phloem for the transport of waters (xylem) and sugars (Phloem), found in the mesophyll layer

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Cuticle

Waxy layer to prevent water loss

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Epidermis

Protective layers (contain Stomata and Guard Cells)

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Palisade Mesophyll

Tightly packed cells with a lot of chloroplast

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Spongy Mesophyll

Loosely packed cells with air spaces to allow for movement of gases

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Xylem

Vascular tissue that moves water throughout the plantP

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Phloem

Vascular tissue that moves glucose throughout the plantStoma

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Stomata

Opening in epidermis that allows gases in and out of the leaf. Also regulates water loss guard

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Guard Cells

Control the opening of stomata

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Plant Tropisms

  • Tropism : Plant response to an external stimulus

    • Positive : Plant moves towards stimulus

    • Negative : Plant moves away from stimulus

  • Phototropism : Light

  • Gavitropism : Gravity (Geotropism)

  • Thigmotropism : Touch (Doesn’t have to be human