Download SECTION 3

SECTION 3
SEED PLANTS
CHARACTERISTICS OF SEED PLANTS
 MOST HAVE LEAVES, STEMS, ROOTS AND VASCULAR TISSUE
 PRODUCE SEEDS CONTAINING EMBRYO AND STORED FOOD FOR
NEW PLANT
 TWO GROUPS-ANGIOSPERMS AND GYMNOSPERMS
LEAVES
 WHERE PHOTOSYNTHESIS TAKES PLACE
LEAF CELL LAYERS
 EPIDERMIS-UPPER AND LOWER LAYER OF LEAF-FOR PROTECTION
 CUTICLE COVERS LEAF TO HOLD IN WATER
 STOMATA-ALLOW CO2, O AND H2O TO ENTER AND LEAVE LEAF
 GUARD CELLS OPEN THE STOMATA
 PALISADES LAYER CONTAINS CHLOROPLASTS
 SPONGY LAYER-CONTAINS VASCULAR TISSUE
STEMS
 SUPPORT BRANCHES, LEAVES AND REPRO. STRUCTURES
 EITHER HERBACEOUS- SOFT AND GREEN, LIKE TULIP
 OR WOODY- HAVING HARD, RIGID WOODY STEMS LIKE A TREE OR
BUSH
ROOTS
 LARGEST PART OF PLANT
 ACT AS ANCHORS
 STORE FOOD
 DISOLVED SUBSTANCES ENTER THE PLANT AT ROOTS
 ROOTS STORE EXTRA WATER FOR DRY TIMES
 ABSORB OXYGEN
VASCULAR TISSUE
 XYLEM-CARRIES WATER THRU PLANT
 PHLOEM-CARRIES NUTRIENTS THRU PLANT
 CAMBIUM-PRODUCES NEW XYLEM AND PHLOEM CELLS TO
INCREASE THICKNESS OF STEMS AND ROOTS
GYMNOSPERMS
 OLDEST TREES
 VASCULAR PLANTS WITH UNPROTECTED SEEDS
 HAVE NO FLOWERS
 PRODUCE CONES WITH SEEDS
 MAINLY EVERGREENS (CONIFERS)
ANGIOSPERMS
 VASCULAR PLANTS WITH FLOWERS
 PRODUCE FRUITS WITH SEEDS
 MOST KNOWN SPECIES OF PLANTS ARE ANGIO.
FLOWERS
 VARY IN SIZE
 SOME DEVELOP INTO FRUIT CONTAINING SEEDS
 DIVIDED INTO MONOCOTS AND DICOTS
MONOCOTS AND DICOTS
 MONOCOTS-ONE COTYLEDON FOOD SOURCE
 DICOTS -2 COTYLEDONS
 MONOCOTS-CORN, WHEAT, RICE, BANANAS, PINEAPPLE. HAVE
PARALLEL VASCULAR TISSUE, LONG THIN LEAVES
 DICOTS-PEANUTS, GREEN BEANS, PEAS, APPLES, MOST SHADE
TREES. VASCULAR TISSUE GOING THRU ALL PARTS OF LEAF,
VARIOUS SHAPED LEAVES
LIFE CYCLE OF ANGIOSPERMS
 SOME GROW TO MATURITY IN LESS THAN A MONTH, WHILE SOME
TAKE CENTURIES
 ANNUAL PLANT-LIFE CYCLE COMPLETED IN 1 YEAR-REPLANTED
EACH YEAR
 BIENNIAL-COMPLETE LIFE CYCLE IN 2 YEARS
 PERENIAL-TAKE MORE THAN 2 YEARS TO GROW TO MATURITY.
COME BACK EACH YEAR
IMPORTANCE OF SEED PLANTS
 MAKING PAPER
 CLOTHING FROM COTTON
 FOOD TO EAT
 MEATS THAT ANIMALS EAT SO WE CAN EAT THEM
PRODUCTS OF SEED PLANTS
 WOOD AND PAPER FROM CONIFERS
 RESIN FOR MAKING SOAP, PAINT AND MEDICINES
 CROPS WE USE FOR FOOD
 FIBERS USED TO MAKE CLOTHING