According to Northwest Missouri State University, a leaf can be simple or compound. This is determined by the leaf’s blade and petiole attachment. Simple leaves have buds that are located where the petiole meets the stem of a single leaf. Compound leaves have the same petiole attachment, but are divided into multiple sections and can be palmate, pinnate or bipinnate. Leaves are also categorized by edge and blade shape.Continue Reading
Palmate leaves are composed of small leaflets that connect at a shared point and spread out like the fingers on a hand. Pinnate leaves have a center nerve, the midrib, with attached nerves that fan out like a plume. Bipinnate leaves are pinnate leaves that are divided into two halves.
Leaves with wavy edges are called sinuate leaves, while the edges of entire leaves are smooth. The edges of dentate leaves look like teeth, and serrate leaves are saw-like. Lobed leaves have rounded divisions that do not reach the center. Blades that are shaped like spears are called lanceolate, and blades shaped like needles are called acicular. Egg-shaped leaves, also referred to as ovate, have wide bases. Linear leaves have blades with a length that is much longer than their width. Elliptical leaves have a width that is two to three times shorter than their length.Learn more about Biology
Cellulose is important as it is the major component of every plant cell wall and is therefore the most abundant organic compound on earth. Cellulose is a large molecule, composed of over 3,000 glucose units each, and is very difficult to break down chemically. Together with pressurized water vacuoles in plant cells, cellulose cell walls are crucial to maintaining and protecting plant structures.Full Answer >
Hydrolysis is a chemical decomposition reaction involving water and another chemical that forms at least one new compound. Dissolving a salt, either of a weak base, weak acid or both, is the most common type of hydrolysis. The water in the reaction ionizes into OH- ions and H+ ions. H+ ions hydrate to form H3O+ ions. The salt also dissociates into positive and negative ions.Full Answer >
The C4 pathway is a method plants use to convert atmospheric carbon dioxide into a chemical compound containing four carbons. About.com explains that plans that utilize this pathway usually originate in subtropical areas. Examples include maize, sugarcane, sorghum, millet and papyrus. These plants commonly grow at latitudes below 45 degrees, in the tropics.Full Answer >
Dissecting microscopes are low-magnification microscopes that can focus on a three-dimensional object that is too thick to be viewed in a regular compound microscope. Dissecting microscopes are also called stereo microscopes as they are designed to allow three-dimensional objects to be seen in three dimensions.Full Answer >