why is classification necessary in science?

Answer 1

Because you placed your question in botany I will answer your question based on plant classification. Classification is used to make things easier to identify. Common names of plants can vary differently from one region to the next, whereas with Botanical Latin the plant carries but one scientific name. The first part of the scientific name is the genus and the second part of the name is the species. The two parts together make the scientific name. Botanical Latin is universally spoken all over the world.For example, I could go to a nursery any where in the world and ask for an Acer rubrum and they would know what plant I'm seeking but if I went in and asked for a red maple they may not.

Answer 2

Classification is a way to place objects in a relational context. We do this all the time in real life: for example when we talk about members of our extended family and use terms like brother, cousin, uncle etc. People can understand without you having to spell out the actual connections. It is pretty much the same in science. If I use the name Pinus radiata it carries with it a lot of information: you automatically know it is related to Pinus ponderosa and other pines and gives you a shorthand way of talking about a tree without having to describe them to people. You can use the English names of the trees (Monterey Pine & Ponderosa Pine) to talk about them but, if you think about it, that is just another form of classification. The advantage of the scientific classification is that names are unique; English names can vary from place to place (Pinus radiata is called Radiata Pine in Australia, for example).