1) If the index is above 80 it indicates a ______________condition? longheaded r
ID: 101387 • Letter: 1
Question
1) If the index is above 80 it indicates a ______________condition?
longheaded
roundheaded
oval headed
short headed
2)Indices are a better comparison method for specimens because?
-Provides another measurement for comparison
-None of the above
-Overcomes differences in size between specimens
-Estimates the overall size of a specimen
3) To calculate the total magnification of a specimen you use which equation?
-Objective lens x 100
-Objective lens x ocular lens
-Ocular lens x 10
-Objective lens x condenser
4) A device used to identify organisms that is based on a series of successive choices is called a:
________________ key
-Dichotomous
-phylogenetic
-Taxonomic
-Morphological
-Binomial
Explanation / Answer
1. short headed
The cephalic index is the breadth multiplied by 100 divided by the length. An index of less than 75 means that the skull is long and narrow when seen from the top; such skulls are called dolichocephalic and are typical of Australian aborigines and native southern Africans. An index of 75 to 80 means that the skull is nearly oval; such skulls are called mesaticephalic and are typical of Europeans and the Chinese. A skull having an index of over 80 is broad and short, and is called brachycephalic; such skulls are common among Mongolians and the Andaman Islanders.
2,Indices are a better comparison method for specimens because it Overcomes differences in size between specimens.
3.Total magnification of an object observed through the eyepieces (ocular lens) is calculated by multiplying the ocular lens magnification times the magnification of the objective lens being used (either: 4X, 10X, 20X, 40X, 100X, etc.). “X” is placed after obtaining the total magnification number.
4. a taxonomic key is a device for quickly and easily identifying to which species an unknown plant belongs.
The key consists of a series of choices, based on observed features of the plant specimen. It provides a choice between two contradictory statements resulting in the acceptance of one and the rejection of the other.
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