A biological key, also known as an identification key or a dichotomous key, is a way to classify organisms by giving the classifier two options in each stage until identification occurs. For example, in order to identify the tree, a biological key gives two choices – conifer or broadleaf – with a description of each one. Depending on the answer, another question pops up to narrow down the species.Know More
The biological key works by reducing the number of possible identities for a species until the right one is reached by using questions with only two answers, according to Dictionary.com. In order for them to be successful, biological keys must have sound designs. A key needs to be diagnostic, which means that it needs to focus on the characteristics unique to a particular group. A key also needs to be differential, separating a group based on differences. A key needs to be redundant; certain characteristics should be revisited to improve reliability.
Terminology is an important aspect of a biological key. The wording needs to be uniform and consistent throughout the key, and the two possible answers need to parallel each other as much as possible. If a color and blossom size for a flower in one option is given, then the other option also needs to include a color and blossom size.Learn more about Biology
Autotrophs and heterotrophs differ in the way they obtain energy; autotrophs make their own energy whereas heterotrophs must consume other organisms to get their energy. Autotrophs are the producers of ecosystems, which means they are the providers of energy for the rest of the organisms within the ecosystem.Full Answer >
Prezygotic refers to any stage of the reproductive process before the formation of the zygote, while postzygotic refers to any point of life after the ovum has been fertilized. Both terms are used when describing the fertilization and conception processes.Full Answer >
Chrysalis and cocoon are two physical objects that are made in the same phase of a butterfly or moth's life, however, a chrysalis refers to the casing that a butterfly makes when it transforms, whereas a cocoon is a woven case made by a moth during this stage to protect itself. The materials that a cocoon and a chrysalis are made of are also different.Full Answer >
Stoneflies do most of their eating while they are in the larval stage, during which time they capture and eat other small insects and invertebrates. The adult stage of a stonefly's life cycle is primarily concentrated on breeding, and many species die shortly after breeding. While some adult stoneflies do not eat at all, others consume pollen or algae.Full Answer >