The scientific classification of Grapefruit and Pear includes the entire classification chart that includes kingdom, family, clade, tribe etc. A kingdom is the second highest taxonomic rank. A taxonomic rank is the level that a living organisms are placed in hierarchical level of arrangement of life forms. All the living organisms are divided into kingdoms. Plant kingdom is a main classification of living organisms that include all plants. There are six kingdoms which are: Plantae, Animalia, Fungi, Protista, Aschaea/Archaeabacteria and Bacteria Eubacteria. Grapefruit and Pear kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Grapefruit and Pear family is a major factor of Grapefruit and Pear Scientific Classification. Plant family helps you narrow the search of your plants. It also gives you idea about, how the plant looks, how the seed will be like etc. These two plant families can be different or same. Grapefruit belongs to the family Rutaceae and Pear belongs to the family Rosaceae.
While comparing scientific classification, Grapefruit and Pear genus and other classification are also important. Also, when you compare Grapefruit and Pear, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Citrus and other plant's genus is Pyrus. Grapefruit tribe is Not Available and Pear tribe is Maleae. Grapefruit clade is Dicotyledonous and order is Sapindales whereas Pear clade is Angiosperms, Eudicots and Rosids and order is Rosales. Every plant have subfamilies. Grapefruit subfamilies are, Rosoideae and Pear subfamilies are Amygdaloideae. In this way you can compare scientific classification of Grapefruit and Pear and other products also.