Plant Unit: Roots, Stems, and
What are Xylem and Phloem?
► Transport System
► Similarto our veins and arteries
► Xylem – moves water from roots to leaves
► Phloem – Transport nutrients and products
of Photosynthesis throughout the plant.
► Move water and other minerals from roots
to all other parts of plant.
► Moves the products of photosynthesis
(sugar) from the leaf throughout the plant.
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
► Described ascentral fleshy root
► Taproot = main root of a plant.
► Many fibrous roots are present at the
same time. All branching from main
► Grasses are an example of a fibrous
► Roots are made of different tissues.
► Vascular Tissues
Cross Sections Of Roots
Ranunculus root @ 40 X
Ranunculus root @
► Hold Leaves up in Sunlight
► Transport water and minerals between
Leaves and Roots
► Stem Parts:
► Three major zones.
► Vascular Cambium
Cross Sections of Stems
► Alfalfa stem @ 100 X
Corn stem @ 100 X
- Both Sides
- Guard Cells
2. Palisade Layer
3. Spongy Mesophyll
4. Vascular Bundles
► Reproduction (sexual) takes place in the
► Stamen=male reproductive system
► Pistil=female reproductive system
► Petals=color to attract pollinators
► Sepals=outer part of flower; provides
protection to the ovary/ovule.
► Consists of:
pollen is made and
► Consists of:
Stigma=sticky surface for pollen to land on
Style=connects stigma to ovary
Ovary=contains ovules with egg—becomes the fruit we
Ovule=contains ONE egg—will become the seed!