分类检索（Classified retrieval）.docVIP

分类检索（Classified retrieval） 0 people think the answer is good | 0 people think the answer did not help The compiling and using method of two dimension retrieval table The compiling principle of 1. category search table A classification table is a table for the purpose of distinguishing living things. At present, the commonly used is the two difference classification retrieval table. This kind of search table divides the same type of animals and plants into two corresponding branches according to the difference of one or two pairs of relative characters. Then, according to one or several pairs of relative traits, each branch above and then divided into two branches corresponding to the two branches of the same type as SOD, so, step by step arranged down, until the developed classification includes all taxa retrieval table. 2. the type of the look-up table (1) fixed distance retrieval table, this form is also called back form retrieval table. In the arrangement of every two corresponding branch at the beginning, all in the same distance from the left end of the place, each of the following branches, at the beginning of the two branches of the corresponding, compared to the original branch to the right one word, this arrangement continues, until the end point. For example, distance plants are divided into a gate retrieval table: 1. the plant has no root, stem and leaf differentiation, no embryo. 2. plants are not symbionts composed of algae and fungi. 3. plants contain chlorophyll and other pigments, which are autotrophic life forms.................. Algal plants 3. plants have no chlorophyll or other pigment, which is a heterotrophic lifestyle.................. Fungi plant door 2. plant bodies are symbionts composed of algae and fungi.................................... Lichenes 1. plants have roots, stems, leaves differentiation, there are embryos. 4. plant bodies have stems and leaves without true roots............................................. Mossy plant door 4.