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LIFESC Grade 10: Strand 4 > Biodiversity And Classification > Flashcards

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What is species diversity?

1. Variety of living organisms in a certain region
2. Variation of different organisms making up an ecosystem


What is genetic diversity?

1. Variety of genes within a species
2. Ensure survival of the species


What is ecological diversity?

1. Variety of ecosystems found on earth


What is a species?

1. Groups of similar organisms that can interbreed freely and produce fertile offspring


What is a keystone species?

1. An organism that plays an unusually large role in an ecosystem
2. Important in maintaining species diversity
3. Dies out= many other species die out
E.g. Protea for fynbos ecosystems


What is classification?

1. The system of grouping organisms together based on shared characteristics


What is taxonomy?

1. The science of classification
2. Grouping of organisms based on similarities/ shared characteristics, using:
•fossil records
•molecular biology


What is nomenclature?

1. Naming of organisms


What is systematics?

1. Placing of organisms into groups


Who was Carolus Linnaeus?

1. Developed the Linnaen system of binomial nomenclature


What is the Linnaen system?

1. Greek & Latin (mutual languages) used
2. Uses the hierarchical system- genus
3. Both names underlined or written in italics


What is a binomial name?

1. Formal species name consisting of two parts


What is a genus name?

1. First part of the name
2. Capital letter first


What is a species name?

1. Second part of name
2. No capitals


What is classification essential for?

1. Communicating
2. Describing & Placing
3. Arranging collections
4. Understanding relationships
5. Mapping Geographical & Ecological patterns
6. Conservation


What are the classification keys?

1. Tables
2. Pictorial
3. Dichotomous
4. Branched (tree)
5. Venn diagram


What is hierarchical classification?

1. A highly organized system made up of nested sets of increasing/ decreasing rank
2. Effective way of arranging large groups of objects-artificial
- natural
3. Objects can be easily added and found


What are nested sets?

1. Each level is more inclusive as you go up


What is a key?

1. Practical device used to name and classify unfamiliar organisms
2. Made of a series. Of written questions/ statements
3. Answers/ choices made in each step lead to final identification


What is biodiversity?

• the variety of living organisms on earth


What is a prokaryote?

1. No distinct nucleus
2. Lack of complex organelles
3. DNA is free in cytoplasm
4. All prokaryotes are called bacteria


What is a Eukaryote?

1. Has a distinct nucleus
2. Have complex organelles
3. DNA lies within nucleus
4. Protists, plants, fungi & animals are eukaryotes


What is the criteria used to classify organisms?

1. Body structure
2. Cell wall composition
3. Cell-ultra structure
4. Mode of nutrition
5. Method of reproduction
6. Motility