Biological Classification and Characteristics of Kingdoms

Artificial Classification is based on superficial characters that do not necessarily show evolutionary relationships.
Natural Classification uses specific levels of taxonomic categories:
- Kingdom
- Division (suffix: $-phyta$ )
- Class (suffix: $-opsida$ )
- Order (suffix: $-ales$ )
- Family (suffix: $-aceae$ )
- Genera
- Species

Based on Type of Nutrition:
- Autotrophic plants: Capable of manufacturing their own food.
- Heterotrophic plants: Incapable of manufacturing their own food.
Based on Water Requirement:
- Mesophytes: Require a moderate water supply.
- Xerophytes: Can withstand very little water.
- Hydrophytes: Require an abundant supply of water.
- Halophytes: Require water with high salt content.
Based on Body Appearance:
- Trees: Woody plants with a single main stem, commonly $20\,feet$ or more in height.
- Shrubs: Woody plants with a relatively short main stem and many branches.
- Herbs: Plants with soft stems.
- Vines: Climbing or twining plants with either soft or hard stems.

Animalia:
- Eukaryotic and multicellular.
- Possesses a nuclear membrane, membrane-bound organelles, and chloroplasts.
- Heterotrophic through ingestion; lacks a cell wall.
Archaebacteria (Ancient Bacteria):
- Prokaryotic and unicellular.
- Lacks a nuclear membrane and chloroplasts.
- Possesses a non-cellusoic cell wall.
- Heterotrophic or chemoautotrophic; many are extremophiles that do not form spores.

Fungus-like Protists (Thallophytes): Resemble fungi but have protist-like cellular structures. They absorb nutrients from dead matter and lack chitin in cell walls.
- Myxomycota (Slime Fungi):
- $\text{Fuligo septica}$ : Found on logs in summer; leaves a trail behind it.
- $\text{Ceratiomyxa fruticulosa}$ : Grows on soft, spongy wood.
- Eumycophyta (True Fungi):
- Subdivision Zygomycotina: Grows on damp organic material like bread; Example: $\text{Rhizopus}$ species (Black Mold).
- Subdivision Basidiomycotina: Found in grassy places. Example: $\text{Amanita muscaria}$ (Fly Agaric Mushroom); can be used to make poisoned bait for fireflies.
Plant-like Protists (Unicellular Algae):
- Division Pyrrophyta ( $\text{Gonyaulax}$ ): Stores food as starch, fats, and oils; produces toxins resulting in ‘red tide’ that interferes with sodium exchange in nerve membranes ( $\text{Gymnodinium}$ ).
- Division Chrysophyta (Diatoms): Stored food includes chrysolaminarin, fats, and oils; pigments are carotenes and xanthophylls. Used in polishes for silverware and metals.

Non-Vascular Plants: Lack conducting tissues.
- Thallophytes: Simplest forms; body (thallus) is not differentiated into roots, stems, or leaves.
- Bryophyta: Possess root-like structures (rhizoids), stem-like structures (caullids), and leaf-like structures (phyllids). Includes Division Hepatophyta (liverworts), Division Muscitophyta (mosses), and Division Anthocerotophyta (hornworts).
Seedless Vascular Plants: Include Division Psilotophyta (whisk fern), Division Lycopodiophyta (club moss), Division Equisetophyta (horsetails), and Division Pteridophyta (ferns like $\text{Dryopteris}$ or $\text{Aspidium spinulosum}$ ).
Seeded Vascular Plants (Angiospermae): Seed-bearing flowering plants.
- Division Liliophyta: Monocotyledonous plants.
- Division Magnoliophyta: Dicotyledonous plants.

Vegetative Parts:
- Roots: Usually underground; function in anchorage and absorption of water/nutrients.
- Stem: Usually above ground; conducts materials between roots and leaves and supports foliage/flowers.
- Leaves: Bifacially flattened stem appendages; primary site for food production.
Reproductive Parts: Cones and Flowers are reproductive shoots involved in seed formation.
Common Angiosperm Families:
- Lauraceae: Avocado.
- Lamiaceae: Peppermint, Spearmint.
- Apiaceae: Celery, Carrot.
- Solanaceae: Tomato, Potato, Tobacco, Chili pepper.
- Cactaceae: Cactus.

Dialogue regarding specimen characteristics: A pink substance like a paste is brought out when its wall breaks.