Lichen Lab Report - Photosynthesis and Cellular Respiration Rates of Lichen Bailee Gallant Jasmine Attar Derek deSousa Taylor Thomas Abstract The

Lichen Lab Report - Photosynthesis and Cellular...

This preview shows page 1 - 2 out of 9 pages.

Photosynthesis and Cellular Respiration Rates of Lichen Bailee Gallant, Jasmine Attar, Derek deSousa, Taylor Thomas Abstract: The purpose of this lab was to gain a better understanding the metabolic reactions photosynthesis and cellular respiration. A mutualistic organism known as lichen undergoes photosynthesis and cellular respiration simultaneously due to its symbiont partners of a lichenized fungus and algae or cyanobacteria. The lab was centered around discussing and observing the CO2 and O2 levels created by the lichen within dry and hydrated environments. O2 levels and CO2 levels were taken in a control dry and control wet environment container with no lichen placed inside. Then four different types of lichen were placed in containers. O2 and CO2 levels were then measured over the course of thirty minutes for each environment, respectively. Data was collected and recorded with oxygen and carbon dioxide sensors. Data was then analyzed through graphing and visual observation. Lichen functioned much more efficiently in a hydrated environment rather than a dry one. Oxygen and carbon dioxide levels for all lichen species were higher in hydrated environments than in dry ones, with the exception of beard lichen which had a slightly higher CO2 output in dry conditions. Introduction: The purpose of this lab was to gain a better understanding of the metabolic reactions known as cellular respiration and photosynthesis in different environments. To observe these reactions, a symbiotic species was used that undergoes both reactions simultaneously. This organism is lichen. Lichen are important pieces to any ecosystem. Being photosynthetic, they remove CO2 from the air and create oxygen (Kilian et. al., 1984). However, lichen also possess a unique ability to “fix” nitrogen in the air (N2) into nitrates (NO3), which are essential for plant synthesis of amino acids. (Henriksson and Simu, 1974). As stated previously, lichen is a mutualist symbiont. It consists of the lichen fungus and an algal or cyanobacteria species (Ahmadjian and Jacobs, 1981) The algae or bacteria photosynthesizes and creates food for the fungi to metabolise. The algae or bacteria could survive on its own, however the fungus needs it’s symbiont partner to survive. (Honegger, 1991) Lichen are also very resistant to dessication. They can recover rapidly to full photosynthetic and cellular respiration processes when moistened after long dry periods (Henriksson and Simu, 1974). Lichen also live in a variety of environments and locations. They can be found in tundras, temperate forests, vertical and flat rock faces, trees, and mossy areas. This ensures they can thrive in most conditions (Beattie and Pharo, 2002). For the lab to be properly conducted, a hypothesis was formed for testing. Two different environments were created. One where lichen was placed in a dry container, and another where it was placed in a hydrated container. If lichen were placed in a dry, sealed environment, CO2 levels would be higher than O2 levels. This is due to the occurrence of cellular respiration
Image of page 1

Subscribe to view the full document.

Image of page 2
  • Spring '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes