Unit 5Unit 5Plant SciencePlant Science

Importance of PlantsImportance of Plants

FoodClothingOxygen

MedicinesCosmetics

Reduce erosion

Parts of a PlantParts of a Plant

5 Main PartsLeaves

Roots

Stems

Flowers

Seeds

LeavesLeaves

RootsRoots

Fibrousfinely branched roots

Tapone central root

Adventitiousgrow from stems or leaves

Aerialabove ground – no main root system

StemsStems

• Buds form at nodes

• Internode = space between nodes

• Vascular system = phloem and xylem

• Many times used as silage for livestock

FlowersFlowers• Female = Pistil– stigma, style, ovary

• Male = Stamen– anther, filament– pollen forms on anther

• Ovules form into seeds• Ovary forms the fruit

SeedsSeeds

Plant GrowthPlant Growth

PhotosynthesisPhotosynthesis

Water + Carbon Dioxide Sugar + Oxygen ChlorophyllSunlight

Fruits, Nuts and Fruits, Nuts and VegetablesVegetables

Pomology and Olericulture

• Fruits– Pome or Stone– Citrus or Non-citrus

• Vegetables

• Nuts

More than Just Food and More than Just Food and FiberFiber

• Plant medicines• Cosmetics• Gifts• Recreation• Decoration• Noise buffers• Animal homes

Genetically Modified Genetically Modified PlantsPlants

• Parent traits are passed along through reproduction (genes)• Hybrids combine traits from different species

• Genetic modification changes the genetic make-up of plants