Download Plant Tissues and Organs

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Transcript
Plant Tissues and
Organs
What is a plant?
 A plant is a multicellular eukaryote that  has cellulose in the cell walls,
 stores food in the form of starch,
 has a cuticle- a waxy, waterproof coating on
the stems and leaves. Cuticles help to
prevent water loss
Plant Tissues
 Dermal- surrounds plant
 Vascular- transports food and water
- Xylem- moves WATER UP
- Phloem- flows FOOD (SUGAR)
DOWN
 Ground- photosynthesis, storage, support
 Meristematic- area where growth occurs
Roots
 Function:
 take in water and nutrients from the soil
 Anchor the plant in the soil
 Sometimes act as storage (radishes, carrots,
etc)
 Most grow underground
 Contains vascular tissue (xylem & phloem),
ground tissue (cortex), dermal tissue and
meristematic tissue (root tips)
Root Cross-Section
Stems
 Function:
 provides support for growth
 transports water, food and minerals to and
from roots and leaves
 Contains all tissue types
Leaves
 Function: usually the site of photosynthesis
 Increased surface area to allow maximum
absorption of sunlight
 Contains guard cells & stomata sites of
gas exchange
Reproduction
 Mosses and ferns use spores
 All other plants produce seeds- contain the
embryo, food source, and a protective coat
 Flowers are the reproductive structure in highly
evolved plants
 Most flowers contain both male and female
reproductive parts (complete flower)