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Plant Parts - Stems The plants inner highway 2001 AgriTeach.com TM (12901ms)

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Presentation on theme: "Plant Parts - Stems The plants inner highway 2001 AgriTeach.com TM (12901ms)"— Presentation transcript:

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2 Plant Parts - Stems The plants inner highway 2001 AgriTeach.com TM (12901ms)

3 Why do plants have stems? They have two functions: They have two functions: moving materials (water, minerals, food) moving materials (water, minerals, food) supporting the rest of the plant supporting the rest of the plant The stem has rings called nodes The stem has rings called nodes the space in-between is called the internode the space in-between is called the internode At each of the nodes is a bud At each of the nodes is a bud

4 Stem Anatomy - External

5 Stem Anatomy - Internal When a plantlet develops from a seed, it may have one or two seed leaves or cotyledons When a plantlet develops from a seed, it may have one or two seed leaves or cotyledons Plants with one are monocots Plants with one are monocots Grasses - lawn grasses, corn, wheat, etc.Grasses - lawn grasses, corn, wheat, etc. Plants with two are dicots Plants with two are dicots Other plants - trees, beans, alfalfa, etc.Other plants - trees, beans, alfalfa, etc. Both types have different arrangements of their vascualar bundles Both types have different arrangements of their vascualar bundles These are the veins and arteries of the plantThese are the veins and arteries of the plant

6 Vascular Bundles

7 The arrangement of the bundles: The arrangement of the bundles: Allows dicot stems to grow thicker & taller Allows dicot stems to grow thicker & taller Trees have active, living tissue around the outside of the trunk; inactive heartwood on the inside.Trees have active, living tissue around the outside of the trunk; inactive heartwood on the inside. To make syrup, we tap the outside because it is busy moving sap (nutrients).To make syrup, we tap the outside because it is busy moving sap (nutrients). Limits monocots to a certain size Limits monocots to a certain size Inside the bundles: Inside the bundles: xylem tissue moves materials up the plant xylem tissue moves materials up the plant phloem moves materials down the plant phloem moves materials down the plant

8 Plant Parts - Roots

9 Functions of the Roots Anchor the plant Anchor the plant Absorb water and nutrients Absorb water and nutrients

10 Different Types of Roots Tap Roots – one main root Tap Roots – one main root Ex. Carrots Ex. Carrots Function – storage of excess food Function – storage of excess food Fibrous Roots – branched roots Fibrous Roots – branched roots Spread out in the soil in search of water and nutrients Spread out in the soil in search of water and nutrients Root Hairs – tiny hair-like roots Root Hairs – tiny hair-like roots Absorbs much of the water and nutrients for the plant. Absorbs much of the water and nutrients for the plant.

11 Parts of a seed Embryo - develop into all the different tissues that will ultimately make up the mature plant Embryo - develop into all the different tissues that will ultimately make up the mature plant Seed Coat - protects the internal parts of the seed Seed Coat - protects the internal parts of the seed Endosperm - serves as a food source for the developing embryo Endosperm - serves as a food source for the developing embryo

12 Parts of the Seed endosperm

13 Germination * When a seed sprouts and begins to grow

14 Monocot vs. Dicot Dicot Germination Monocot Germination


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