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Notes from Wednesday's Lecture

by: John Bacovcin

Notes from Wednesday's Lecture BZ 120

Marketplace > Colorado State University > Biology > BZ 120 > Notes from Wednesday s Lecture
John Bacovcin
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About this Document

The first of the Introduction to Class lecture notes.
Principles of Plant Biology
Dr. Ingrid Jane Slette
Class Notes




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This 2 page Class Notes was uploaded by John Bacovcin on Thursday January 28, 2016. The Class Notes belongs to BZ 120 at Colorado State University taught by Dr. Ingrid Jane Slette in Winter 2016. Since its upload, it has received 33 views. For similar materials see Principles of Plant Biology in Biology at Colorado State University.

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Date Created: 01/28/16
Notes from the first “Introduction” lecture (1-27-16) Important terms From the beginning of lecture: Botany: The scientific study of plants and plant-like organisms. Ex: trees and shrubs (plants) fungi and algae (plant-like organisms). Autotrophic: The ability for an organism to feed themselves. Another way of looking at it is that autotrophs do not need to consume other living things in order to survive. Green plants, which are an example of autotrophs, do this by undergoing photosynthesis. Heterotrophic: The need for an organism to consume other living organisms to create energy for itself. Heterotrophs must eat other things to live. Photosynthesis: A gas exchange that is undergone by green plants that exchanges CO2 for O2. This gas exchange also includes light and water and creates sugars for the plants to use. (the chemical equation for photosynthesis can be found below): 6CO2 + 6H2O + Light  C6H12O6 + 6O2 Plants use the sugars that are produced during photosynthesis to survive. These plants make up the base or bottom of any food chain. Another term that can be used for plants are primary producers as they produce the primary energy in any food chain. Another advantage to having plants that can photosynthesize is that we can use those sugars, a product of photosynthesis, to create biofuels like ethanol. Ethanol goes into gasoline to make it more efficient. These plants are also a part of fossil fuel production as they can become coal, petroleum (oil), or natural gas after millions of years. Plants are also useful in the medical field as many of our modern medicines are derived from compounds produced by plants. In fact it was this ability to be used in medicine that prompted the first botanists. Botanists like the ancient Greek Theophrastus. The advances made by Theophrastus in the field of botany can still be seen today. He was considered the father of botany and was a student of Aristotle. He first came up with the three “organs” of the plant; the stem, the leaf, and the roots. Stems are the above ground axes from which theh plant grows. These can be anything from branches to tree trunks. Leafs are the organ that attaches to the stems. They are perpendicular to the stem and are almost always where photosynthesis takes place. Roots are the below ground axes that the plant uses to take up water and any mineral nutrients that it needs. Theophrastus also catergorized plant growth forms and life cycles listed below: Plant Growth forms:  Tree: a woody plant that has a central stem or trunk.  Shrub: a woody plant with multiple stems. Has no central trunk.  Herb: a non-woody plant. (A very broad definition)  Vine: a plant that relies on something else for mechanical support. It cannot support its own weight. Can be either woody or herbatious. Plant Lifespans:  Annual: a plant that only grows and reproduces for one year or growing season. Must be replanted every year.  Biennial: a plant that grows for two years or growing seasons and reproduces on the second year.  Perennial: a plant that lives through many years/growing seasons and flowers or reproduces multiple times. Trees and shrubs are great examples. The “Doctrine of Signatures” was an outdated theory that if a plant resembled a part of the human body it could be used to treat illnesses of that body part. For examples walnuts look like a brain and so were thought to cure brain illnesses.


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