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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