Using Dichotomous Key to Identify Sharks
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Dichotomous key lab for the scientist to ask a series of questions with yes or no answers will practice with dichotomous key regent questions shark dichotomous key answers. Use the image below as a guide to the parts of a shark's body that are used in the dichotomous key.
List four different characteristics that were used in the shark key. Then study organism 1 in for the characteristic referred to in and 1B. To identify an organism, scientists often use a key.
Using Dichotomous Key to Identify Sharks - They describe a shark characteristic that can be used to separate the sharks into two major groups.
Using Dichotomous Key to Identify Sharks Classification is a way of separating a large group of closely related organisms into smaller subgroups. The scientific names of organisms are based on the classification systems of living organisms. The identification of an organism is easy with a classification system. To identify an organism, scientists often use a key. A key is a listing of characteristics, such as structure and behavior, organized in such a way that an organism can be identified. Use the image below as a guide to the parts of a shark's body that are used in the dichotomous key. Read statements 1A and 1B of the key. They describe a shark characteristic that can be used to separate the sharks into two major groups. Then study organism 1 in for the characteristic referred to in and 1B. Follow the directions until the name for Shark 1 is determined. For example, to key a shark that has a body that is NOT kite-shaped when viewed from above and has a pelvic fin and six gill slits, follow the directions of 1B and go directly to statement 2. Follow statement 2B to statements 3. At statement 3A, identify the shark as belonging to Family Hexanchidae. Continue using the key, always starting back at Statement 1a and 1b for each shark until all have been identified. Indicate the family name for each shark in Figure 2 on your word processing document. Then complete the questions under 'Conclusion. Shark Dichotomous Key 1 A Body kite like in shape if viewed from above Go to statement 12 B Body not kite like in shape if viewed from above Go to statement 2 2 A Pelvic fin absent and nose sawlike Family B Pelvic fin present Go to statement 3 3 A Six gill slits present Family B Five gills present Go to statement 4 4 A Only one dorsal fin present Family B Two dorsal fins present Go to statement 5 5 A Mouth at the front of the head rather than back along underside of head Family B Mouth back along underside of head Go to statement 6 6 A Head expanded on the side with eyes at the end of expansion Family B Head not expanded Go to statement 7 7 A Top half of caudal fin exactly same size and shape as bottom half Family Isuridae B Top half of caudal different in size and shape from the bottom half Go to statement 8 8 A First dorsal fin very long, almost half the length of the total body Family B First dorsal fin length much less than the half the total length of body Go to statement 9 9 A A. Caudal fin very long, almost as long as the entire body Family B Caudal fin length much less than length of entire body Go to statement 10 10 A Nose with long needlelike point on end Family Scapanorhynchidae B A light stripe extending the length of the body, a marked constriction at the base of the tail Go to statement 11 11 A Anal fin absent Family B Anal fin present Family 12 A Small dorsal fin present near tip of tail Family B Small dorsal fin absent near tip of tail Go to statement 13 13 A Hornlike appendages at front of shark Family B Hornlike appendages not present at front of shark Family Conclusion 1. What is a classification key and how is it used? List four different characteristics that were used in the shark key. Which main characteristic could be used to distinguish shark 4 from shark 8? Which main characteristic could be used to distinguish shark 4 from shark 7?
Follow statement 2B to statements 3. Continue using the key, always starting back at Statement 1a and 1b for each shark until all have been identified. The identification of an organism is easy with a classification system. Then study organism 1 in for the characteristic referred to in and 1B. Using dichotomous key to identify sharks classification is a way of separating a large group of closely related organisms into smaller subgroups the scientific names of organisms are based on the classification systems of living organisms. Read statements 1A and 1B of the key. Use the image below as a guide to the parts of a shark's body that are used in the dichotomous key. Sharks using a dichotomous key read sentences 1a and 1b of the key then study shark 1 in figure a for the characteristics referred to in 1a and 1b follow the directions in these sentences and continue with this process until a family name for shark 1 is determined shark answer key.
