Back to other Lectures

Lecture 15. Plant Groups, Structure, Organs, and Tissues

1.  Objective

The objective is to introduce the major groups of plants and the structure and functions of plant tissues and organs in higher plants.

2.  Taxonomy and Classification

2.1.  Classification of Life

bulletclassification schemes (15-1)
bulletphylogenetic tree (15-2)
bulletscheme for classifying a species (15-3)

2.2.  Classification of Plants

2.2.1.  Plant phyla (15-4)

2.2.2.  Phylogenetic tree (15-5)

2.2.3.  Examples of Each Phylum

2.2.3.1.  Chromista (15-6) (Chl C algae and pseudofungi (15-7))

2.2.3.2.  Ochrista (15-8)(brown algae)

2.2.3.4.  Rhodophyta (15-9)(red algae)

2.2.3.5.  Chlorophyta (15-10)(green algae (15-11))

2.2.3.6.  Bryophyta (liverworts (15-12), hornworts, moses)

2.2.3.7.  Tracheophyta
bulletlower (15-13)
bullethigher (15-14)
bulletmonocots (15-15)
bulletdicots (15-16)
bulletgymnosperms (produce  cones; green all year, needles)
bulletangiosperms (flowering, leaves [absciss during fall])

 

3. Structures in Higher Plants

3.1.  Development of a Corn Plant (monocot) (15-17)

3.2.  Development of Soybean Plant (dicot) (15-18)

3.3.  Structure of Deciduous Tree (15-19)

3.4.  Pine Cones and Pollen

bullet

female pine cone (15-20)

bullet

male pine cone (15-21)

bullet

female and male cones together (15-22)

bullet

ovules and pollen grains (15-23)

3.5.  Flower Parts (15-24)

3.6.  General Features of Monocots and Dicots (15-25)

3.7.  Leaves and Flowers of Monocots (26) and Dicots (15-27)

3.8.  Leaf Structure

3.8.1.  Types of Leaves

bulletpinnate (15-28)
bulletpalmate (15-29)
bulletcompound (15-30)

3.8.2.  Leaf Anatomy

bulletdiagram (15-31)
bulletEM (15-32)

 

4.  Plant Tissues

4.1.  Outline of Tissues and Functions

bullet

apical and lateral (15-33)

bullet

epidermis and periderm (15-34)

bullet

parenchyma, collenchyma, sclernchyma (15-35)

bulletparenchyma - simple tissue, bulk of plant (photosynthesis, storage, secretion)
bulletcollemchyma - simple tissue (production of new growth)
bulletSclernchyma - simple tissue(supports mature plant parts like seeds)

 

bulletxylem, phloem (15-36)

4.2.  Cellular and Tissue Organization in Plant Stems (15-37)

4.3.  Stem Structure of a Monocot, Corn (15-38)

4.4.  Stem Structure of a Dicot, Alfalfa (15-39)

4.5.  Cross Section of Root

bullet

entire root (15-40)

bullet

stele (15-41)

4.6.  Lateral Root Formation in Willow (15-42)

4.7.  Tree Structure and Tissues

bullet

overview (15-43)

bullet

cross-section, diagram (15-44)

bulletsapwood - new xylem
bulletheartwood - old xylem
bulletannular ring - sapwood and heartwood from one year

 

bullet

cross-section, photo (15-45)

5.  Critical Concepts or Questions

5.1.  What are the major plant groups, distinguishing characteristics, and two examples of each.

5.2.  What are the major differences in monocot and dicot plants?  What is the basis for the name monocot and dicot?

5.5.  Be able to recognize the major organs and tissues of a herbaceous and woody plant.

5.6.  What is the function of each tissue and organ?

6.  Vocabulary

alga angiosperm gymnosperm
dicot flower gametophyte
hypha lichen megaspore
microspore monocot mycelium
mycorrhiza nonvascular plant ovule
parasite plant spore pollination
saprophyte seed sorus
sporophyte vascular plant bud
cork cambium apical meristem cortex
cuticle epidermis internode
lateral meristem leaf node
phloem shoot system vascular bundle
pith root system xylem
vascular cambium vascular column  

7.  Webpage Links

Crops of the U.S. Index - Purdue University [**SELECT** CropSEARCH, then Crop Index ... to access the list] 100's of crops grown in the United States - Latin name, characteristics, and links!

Botanical Gardens Worldwide Links to hundreds!

GardenWeb Glossary of Botanical Terms - GardenWeb "...2565 terms relating to botany"

Ornamental Plants database - T. Rhodus, Ohio State University Select "Plant Dictionary": Images and horticultural descriptions: "A searchable database of over 1,000 links to images and botanical descriptions for 160 selected ornamental plants."

Maize (corn) Structure - Advanced Microscopy and Imaging Laboratory General information and mpeg movies about maize (corn) structure, including an atlas.

Internet Directory of Botany- A.R. Brach, Harvard, R. Lampinen, Univ. of Helsinki, Finland, S. Liu, Univ. of Regina, Canada, and K. McCree, Oakridge, Oregon Alphabetical and categorical directories plus many links.

8.  Illustration Documentation