Intro to plant
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Transcript of Intro to plant
EIS Teaching – Learning Strategies / Procedures
Subject: Biology 3 (M.5), duration 60 min. Teacher: Mr.Wichai Likitponrak
Plant Body Shoot system =
leaves + stem
Root system
Meristem = cells that divide for life of plant, can give rise to all plant structures
Three Types of Plant Tissues Vascular Tissue
◦ Transport
◦ Support
Ground Tissue
◦ Synthesis of Sugars
◦ Storage
◦ Support
Dermal Tissue
◦ Protection
Division of Meristem Cells Causes Plant Growth
Apical Meristem ◦ tips of root and shoot
◦ increase in height
Lateral Meristem ◦ cylinders within plant body
◦ increase in width
Plant Body
Functions
-Exposes surface to sunlight -Major site of photosynthesis -Conserves water -Provides for gas exchange
Blade
Petiole
Leaf = blade + petiole
Stoma =
opening in the leaf for gas exchange,
water evaporation
Plant Body Stem: series of nodes and internodes
Functions
Holds leaves up to light
Transports substances through vascular tissue
Xylem conducts water
and minerals Phloem transports
sugar
Flowering Plant Reproduction
Flowers are modified leaves, specialized for reproduction.
Flower parts undergo meiosis to produce haploid products ◦ pollen grain ◦ ovule (contains egg cell)
Pollen
grains
Ovule
Flower
Meiosis
Mitosis
Mitosis
A Complete Flower Has Both Male and Female Parts
Sepal
Petal
Ovary
Style
Stigma
Pis
til
Anther Filament S
tam
en
Encloses and
Protects Bud
Attracts
pollinator
Male part
Female part Produces egg
Produces pollen
Mature Pollen Grain
Pollination and Fertilization in a Flower
Tube Cell Nucleus
Sperm Cells
1. pollen grains land on stigma
Stigma
Style
Ovary
2. pollen tubes grow down stigma to ovary
Sperm
Egg
3A: Fusion of sperm + egg
3B: Fusion of 2nd sperm + two polar nuclei
3. double fertilization
Polar nuclei
Ovule
Development of Fruit and Seeds From Flower Parts
Triploid Endosperm
Cell
Ovary
Integument
Diploid Zygote
Endosperm
Fresh Fruit
Seed Coat
Embryo (new plant) Seed = embryo + stored food + seed coat
Fruit = ovary wall, mechanism for seed dispersal
Provides nutrition