chapter 1 study guide\n7th grade life science\n1. list the taxonomic groups from largest to smallest…
chapter 1 study guide\n7th grade life science\n1. list the taxonomic groups from largest to smallest. approximately how many species in each?\n|taxonomic group|number of species|\n|--|--|\n|domain eukarya|about 4 - 10 million|\n|kingdom animal|2 million|\n|phylum chordate|50,000|\n|class mammalia|5,000|\n|order carnivora|270|\n|family ursidae|8|\n|genus ursus|4|\n|species ursus|1|\n2. what is a cladogram? how is a family tree show the relationship among family member\n3. what is a dichotomous key?\n4. what are the six characteristics of living things?\n5. what is a reaction to stimulus? what is an example of a reaction to an external stimulus? to an internal stimulus?
Answer
Brief Explanations:
- Taxonomic groups from largest to smallest are Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species. The numbers of species provided are approximate estimates for the given groups.
- A cladogram is a diagram that shows the evolutionary relationships among groups of organisms. A family - tree shows the relationship among family members, but it is not the same as a cladogram which focuses on evolutionary relationships.
- A dichotomous key is a tool used to identify organisms. It consists of a series of paired statements or questions that lead the user to the identification of the organism.
- The six characteristics of living things are: made of cells, reproduce, have a universal genetic code, grow and develop, obtain and use materials and energy, respond to their environment, and maintain a stable internal environment (homeostasis).
- A reaction to a stimulus is a change in behavior or physiology in response to a change in the environment. An example of a reaction to an external stimulus could be a plant growing towards light (phototropism). An example of a reaction to an internal stimulus could be a person feeling hungry (response to low blood - sugar levels, an internal condition).
Answer:
- Taxonomic groups: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species. Approximate species numbers as in the table.
- A cladogram shows evolutionary relationships among groups of organisms. A family - tree shows family relationships.
- A dichotomous key is a tool for organism identification with paired statements/questions.
- Made of cells, reproduce, have genetic code, grow/develop, obtain/use materials and energy, respond to environment, maintain homeostasis.
- Reaction to stimulus is a change in response to environment change. External: plant growing towards light. Internal: feeling hungry.