EVERYDAY SCIENCE

SCIENCE

VIRUS AND BACTERIA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger.The student uses the dichotomous key below to identify it.1. a) Abdomen segmented ____ go to 2 b) Abdomen not segmented ____ go to 42. a) Abdomen with tail ____ go to 3 b) Abdomen without tail ____ go to 53. a) Tail with stinger ____ Scorpion b) Tail without stinger ____ Whip scorpion4. a) Legs longer than body ____ Daddy Long Legs b) Legs not longer than body ____ Wind scorpion 5. a) Covered with spines ____ Mite b) Few spines ____ Tick
A
Whip Scorpion
B
Daddy Long Legs
C
Mite
D
Tick
Explanation: 

Detailed explanation-1: -For example, in tree identification, a dichotomous key might ask whether the tree has leaves or needles. The key then directs the user down one list of questions if the tree has leaves, and a different question list if it has needles.

Detailed explanation-2: -To use the key, the scientist starts at the top, or beginning, and sees which of the two options apply to their organism. Based on their answer, the key directs them to a new question. They continue in this way until reaching an endpoint, the name of an organism.

Detailed explanation-3: -A dichotomous key is an important scientific tool, used to identify different organisms, based the organism’s observable traits. Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification.

Detailed explanation-4: -Q. Which of the following is most helpful for identifying an organism using a dichotomous key? Its physical structures.

There is 1 question to complete.