PlantsPlants

What is a plant?What is a plant? MulticellularMulticellular EukaryotesEukaryotes Cell walls made of celluloseCell walls made of cellulose Have Have chlorophyllchlorophyll to carry out photosynthesis to carry out photosynthesis Chlorophyll is containedChlorophyll is contained

in in chloroplastschloroplasts

Evolution of PlantsEvolution of Plants

Plants evolved from multicellular green algaePlants evolved from multicellular green algae First plants appeared 450 million years agoFirst plants appeared 450 million years ago

BryophytesBryophytes

NonvascularNonvascular (no (no transport system)transport system)

Depend on water for Depend on water for reproductionreproduction

only grow a few only grow a few centimeters tallcentimeters tall

Example: mossExample: moss

Seedless Vascular PlantsSeedless Vascular Plants

Have a vascular systemHave a vascular system Xylem Xylem = carry water= carry water Phloem Phloem = carry nutrients= carry nutrients

Still need water to Still need water to reproducereproduce

Example: fernsExample: ferns

Seed PlantsSeed Plants

Seeds allow plants to Seeds allow plants to reproduce without reproduce without water!water!

Seeds can withstand Seeds can withstand periods of no water, no periods of no water, no food, extreme food, extreme temperaturestemperatures

Seeds spread plantsSeeds spread plants

GymnospermsGymnosperms

Plants with seeds on Plants with seeds on conescones

Example: conifers (big Example: conifers (big trees)trees)

AngiospermsAngiosperms

Flowering plantsFlowering plants Flowers & fruit attract Flowers & fruit attract

animals and aid in animals and aid in dispersaldispersal

Monocots and DicotsMonocots and Dicots