Topic content:
The figure on the right is a partial taxonomic diagram of Leguminosae. The two plants with the closest genetic relationship are
A. Mung beans and string beans
B. Mung beans and red sandalwood
C. Albizia and red sandalwood
D. Albizia and string beans
Best answer:
A
Answer analysis:
The taxonomic units of organisms are in descending order: boundary, phylum, class, order, family, genus and species. The boundary is the largest unit, and the species is the most basic unit. The higher the level of organisms, the farther the kinship between organisms, the less the common points, the lower the level of organisms, the closer the kinship between organisms, and the more common points. According to the classification index, mung bean and string bean belong to the same genus, Mung bean and Albizia leucocephala belong to the same order, and the genus is smaller than the order. Therefore, mung bean and string bean are closer to each other than mung bean and Albizia leucocephala. Albizia leucocephala and red sandalwood belong to the same order, mung bean and red sandalwood belong to the same family, and the order is smaller. Therefore, Albizia leucocephala and red sandalwood have less in common than mung bean and red sandalwood, and the genus, family, and order are the smallest. Therefore, mung bean and string bean belong to the same genus, and have the highest similarity. It can be seen that A.
Comment: This question is relatively new and has certain difficulty. Master the classification level of biology, and clarify the size and kinship between the levels.
Test core:
Biological classification units: the main biological classification units are kingdom, phylum, class, order, family, genus and species. There are also subspecies (abbreviated as subsp.), plants and varieties (abbreviated as var.). Sometimes there are some auxiliary grades. In fact, the main classification grade terms are prefixed with super - and sub -. Sometimes, infraclass and infraorder are set respectively under subclass and suborder. Example: Taking the well-known name Felisdomesticus (domestic cat) as an example, its classification system and name are as follows: Animalia, Chordata, Vertebrata, Vertebrata, Mammalia, Mammalia, Carnivora, Felidae, Felis