The scientific classification of Corn and Grapefruit 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. Corn and Grapefruit kingdom and all other plants kingdom is Plantaea.
Plant family is the group of plants which have something in common. Corn and Grapefruit family is a major factor of Corn and Grapefruit 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. Corn belongs to the family Poaceae and Grapefruit belongs to the family Rutaceae.
While comparing scientific classification, Corn and Grapefruit genus and other classification are also important. Also, when you compare Corn and Grapefruit, other factors should also be taken into considerations like order, subfamilies, tribe, clade etc. First plant's genus is Zea and other plant's genus is Citrus. Corn tribe is Andropogoneae and Grapefruit tribe is . Corn clade is Angiosperms, Commelinids and Monocots and order is Poales whereas Grapefruit clade is Dicotyledonous and order is Sapindales. Every plant have subfamilies. Corn subfamilies are, Panicoideae and Grapefruit subfamilies are Rosoideae. In this way you can compare scientific classification of Corn and Grapefruit and other products also.