Dinoflagellates: Mostly marine (saltwater) organisms with the ability to photosynthesize (like plants). Appearance: Exhibit a variety of colors (yellow, green, brown, blue, red) depending on the pigments within their cells. Structure: Possess a cell wall with stiff cellulose plates providing structural […]

Chrysophytes Members: Diatoms Golden algae (desmids) Habitat: Freshwater and marine environments Characteristics: Microscopic Planktonic (float passively in water currents) Mostly photosynthetic Diatoms: Unique cell walls: Two thin overlapping shells (like a soapbox) Embedded with silica (indestructible) Form diatomaceous earth: Accumulation […]

Archaebacteria: A unique group of bacteria adapted to survive in extreme environments. Key Characteristics: Extremophiles: Thrive in harsh conditions where most other life forms cannot survive. Distinct Cell Wall: Different cell wall structure compared to other bacteria, enabling their survival in extreme environments. […]

Eubacteria (“True Bacteria”) Characteristics: Rigid cell wall Flagellum (if motile) Cyanobacteria (Blue-Green Algae): Contain chlorophyll a (similar to plants) Photosynthetic autotrophs Forms: Unicellular, colonial, filamentous Habitats: Freshwater, marine, terrestrial Often form blooms in polluted water Some fix nitrogen in specialized cells called […]

Kingdom Monera Bacteria: Sole members of Kingdom Monera. Most abundant microorganisms on Earth. Ubiquitous (found almost everywhere): Soil Extreme habitats (hot springs, deserts, snow, deep oceans) On/in other organisms as parasites Bacterial Shapes: Coccus (cocci): Spherical Bacillus (bacilli): Rod-shaped Vibrium […]

Historical Perspective on Classification Primitive Classification: Early classification was instinctive and based on utility (food, shelter, clothing). Lacked scientific criteria. Aristotle’s Contribution: Used morphological characters for classification: Plants: Trees, shrubs, and herbs. Animals: Those with red blood and those without. […]

Rich Variety of Life: Millions of plants and animals have been identified and described. A large number of organisms remain unknown. Organisms vary in size, color, habitat, physiology, and morphology. Need for Classification: The diversity of organisms necessitates defining characteristics […]

Overview of Taxonomic Categories Classification Process: Involves a hierarchy of steps, each representing a rank or category. All categories together form the taxonomic hierarchy. Each category is a taxon (plural: taxa) and represents a unit of classification. Key Features: Categories […]

1. Introduction to Diversity The world is home to a large variety of living organisms, visible (e.g., plants, animals, birds) and microscopic. Biodiversity: Refers to the number and variety of organisms on Earth. Known and described species: 1.7–1.8 million. New […]