Submitted by Emily Burkhart I'd like to start off by saying ♥Happy Valentines day♥ to everyone! In this blog post we'll explore dicot, pine and simple leafs. All the information below has been gathered from lab on Tuesday and Thursday of week 5. Dicot leafBroad Bean Vicia Faba plant was used in class for a look at the cross section for a dicot leaf. There are two groups that all flowering plants or angiosperms were formerly divided into. How they were decided which group they belonged in depended on their characteristics. These two groups are monocots and dicots. The images below are images of the plant and the cross section of the plant broad bean. When looking at the difference between monocots and dicots there are 6 characteristics to look at; seedpod, flower, stem & roots, leaves, germination, and seeds. Here is a link to a really good website that gives more information at distinguishing these differences : http://theseedsite.co.uk/monocots2.html The above slide was taken in class at the magnification of 100x. It is the cross section of a broad bean leaf Simple leafTo the left are 16 examples of what some simple leaves can look like, but what does it mean to be a simple leaf? A simple leaf: An undivided leaf; as opposed to a compound leaf. The blades are not divided into distinct parts, although they may be deeply lobed. Below are some examples of common simple leafs. The two images were from: http://biology.tutorvista.com/plant-kingdom/leaf.html This is also a really good website for a quick summary and run down on comparing leaves FUTURE LOOK > Later in the blog, compounds leaves will be discussed and looked at when comparing simple and compound leaves, but below is a really good video for when identifying the differences and what to look for! Pine leafThis is my favorite kind of pine, Knobcone pine, Pinus attenuata. Knobcone pines is a tree that grows in mild climates on poor soils. It ranges from the mountains of southern Oregon to Baja Califonia with the greatest concentration in northern California and the Oregon-California border. ________________________________________________ FUN FACT: It's actually incorrect to call them pine cones because cones can come from fir trees as well. So they are actually just known as cones and depending on the tree it comes from depends on if it is a pine-cone or a fir-cone. There are around 100 pines, all of which are characterized by an arrangement of leaves that is unique among living conifers. After a year to two years is when the pine will produce needle leaves in a bundles, or fascicles which contains a certain amount of leaves depending on the species. These fascicles are wrapped at the base in small scalelike leaves, and are actually short shoots in which the activity of the apical meristem is restricted so the fascicle of needles in a pine morphologically is determinate. Fascicle: A bundle of pine leaves or other needlelike leaves of gymnosperms; an obsolete term for a vascular bundle. The two cross sections above of the pine leaf were taken at the magnification of 100x. Both images were taken during lab.
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