Plant Unit: Roots, Stems, and Leaves

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Plant Unit Roots, Stems, and Leaves
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What are Xylem and Phloem?

• Transport System
• Similar to our veins and arteries
• Xylem moves water from roots to leaves
• Phloem Transport nutrients and products of
  Photosynthesis throughout the plant.

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Xylem

• Move water and other minerals from roots to all
  other parts of plant.

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Phloem

• Moves the products of photosynthesis (sugar) from
  the leaf throughout the plant.

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Roots Taproots and Fibrous

• Designed to anchor plant to ground.
• Absorbs water, oxygen, and other dissolved
  minerals from soil.
• Stores some of the materials produced by the
  plant.

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Taproots

• Described as central fleshy root
• Taproot main root of a plant.

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Fibrous Root

• Many fibrous roots are present at the same time.
  All branching from main plant.
• Grasses are an example of a fibrous root system.

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Root Tissues

• Roots are made of different tissues.
• Epidermis
• Cortex
• Vascular Tissues

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Cross Sections Of Roots

• Ranunculus root _at_ 40 X

Ranunculus root _at_ 100 X
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Stems

• Hold Leaves up in Sunlight
• Transport water and minerals between Leaves and
  Roots
• Stem Parts
• Epidermis
• Cortex
• Vascular Tissue

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Stems Woody

• Three major zones.
• Xylem
• Bark
• Vascular Cambium

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Cross Sections of Stems

• Alfalfa stem _at_ 100 X Corn stem
  _at_ 100 X

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Leaves Tissues

• 1. Cuticle
• 2. Epidermis
• Both Sides (Upper/Lower)
• Stomata
• Guard Cells
• 2. Palisade Layer
• 3. Spongy Mesophyll
• 4. Vascular Bundles

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Plant Diagram
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Flower Parts

• Reproduction (sexual) takes place in the flower.
• Stamenmale reproductive system
• Pistilfemale reproductive system
• Petalscolor to attract pollinators
• Sepalsouter part of flower provides protection
  to the ovary/ovule.

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Stamen

• Consists of
• Antherwhere the pollen is made and stored.
• Pollencontains sperm cells.
• Filamentsupports the anther

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Pistil

• Consists of
• Stigmasticky surface for pollen to land on
• Styleconnects stigma to ovary
• Ovarycontains ovules with eggbecomes the fruit
  we eat!
• Ovulecontains ONE eggwill become the seed!

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Flowers Diagram