Study Notes
The features of organisms help classify them into different groups based on their characteristics. Organisms are divided into five kingdoms: Animals, Plants, Fungi, Protoctista, and Prokaryotes.
- Animals — multicellular organisms with cells that have a nucleus but no cell walls or chloroplasts. Example: Humans and lions.
- Plants — multicellular organisms with cells that have a nucleus, chloroplasts, and cellulose cell walls. Example: Ferns and flowering plants.
- Fungi — usually multicellular with cells that have nuclei and cell walls not made from cellulose. Example: Mushrooms and yeast.
- Protoctista — mostly unicellular organisms with a nucleus, some have cell walls and chloroplasts. Example: Amoeba and algae.
- Prokaryotes — often unicellular with cell walls and cytoplasm but no nucleus or mitochondria. Example: Bacteria.
- Viruses — not considered living organisms; consist of genetic material inside a protein coat. Example: Influenza virus.
Exam Tips
Key Definitions to Remember
- Multicellular: Organisms made up of more than one cell.
- Photosynthesis: Process by which plants make food using sunlight.
- Saprophytic: Feeding on dead or decaying material.
Common Confusions
- Confusing fungi with plants due to their cell walls.
- Mistaking viruses for living organisms.
Typical Exam Questions
- What are the main features of animals? Multicellular, nucleus in cells, no cell walls or chloroplasts.
- How do fungi obtain their nutrition? By saprophytic or parasitic nutrition.
- What distinguishes prokaryotes from other kingdoms? Lack of a nucleus and mitochondria.
What Examiners Usually Test
- Ability to classify organisms into the correct kingdom.
- Understanding of the features that distinguish each kingdom.
- Knowledge of the basic structure of viruses.