aim: how do the structures of plants enable them to survive? rootsstems leaves
TRANSCRIPT
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Aim: How do the structures of plants enable them to survive?
Roots Stems Leaves
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Main Tissue Systems of Plants:1)Dermal Tissue – the outer covering or the “skin” ofthe plant (epidermis).2)Vascular Tissue – transports water, minerals, andorganic molecules between the roots and leaves.3)Ground Tissue – fills in the spaces between thedermal and vascular tissues.4)Meristem Tissue – generatenew dermal, vascular, and tissues in plants. Found inRoots and stems.
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Root Structure & Function:
Cells divide rapidly by mitosisand allows for growth in length (primary growth).
Roots anchor a plant in thesoil, provide structural support,and absorb water and minerals.
The vascular tissue allows for transport.
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Stem Structure & Function:
Vascular Bundles
Stems are the parts of a plant that support leavesand flowers.
Stems play an important rolein transporting materials in a plant. Vascular tissue runs verticallyinside.
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How are materials transported?
Vascular Tissue:Xylem – transports water& dissolved minerals upward from roots to theleaves.
Transpiration – the evaporation of water from leaves,“pulls” the water up the xylem.
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How are materials transported?TRANSPORTS NUTRIENTS FROM…
The leaf to the roots.
Vascular Tissue:Phloem – transports food madein leaves to the roots & partsof the plant that don’tphotosynthesize (fruits).
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Secondary Growth: Woody Plants
Secondary Growth – growth in plant width.Vascular Cambium – actively dividing cells located between xylem & phloem.Cork Cambium – produces a tough outer layer of cork.
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Leaf Structure & Function:Leaves are the primary food-producingsites of a plant (photosynthesis).
Epidermis – outer layer of cells. Cuticle on surface keeps moisture inside.
Palisade Layer – closely packed photosynthetic cells.
Spongy Layer – loosely packed photosynthetic cells. Allow for gasexchange.
Guard cells – regulate the opening/closingof the stomates.
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How does CO2 get inside the leaf?GUARD CELLS OPEN STOMATES
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Should the stomates always be open? WATER
VAPOR
No, because the plant will lose water & wilt.
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When should the guard cells close the ________?stomates
When it’s really dry
Stomates Open – water vapor exits & carbon dioxideentersStomates Closed – plant is conserving water