Photosynthesis Lab Report

2654 words - 11 pages

Laboratory Report:


Patrick McInerney

Life Science Lab (sec. 801)

10:00-11:50 Mondays

March 11, 2011


Introduction Page 3

Procedure and Results Page 4

Data Results Page 6

Explanations and Conclusions Page 7

References Page 8

Photosynthesis Questions and Answers Page 9

I. Introduction

Why do we care about photosynthesis?

Photosynthesis is not only important to the survival of plants, but to the existence of most of life on Earth. Green plants are a vital part of the circle of life because they ultimately provide food for consumers (organisms that rely on eating other ...view middle of the document...

Note: In the fall season, when there is less sunlight to produce chloroplasts, the leaves absorb all colors but yellow and orange.

Chloroplasts contain stroma, which is the fluid within the membranes, and thylakoids, which are flattened sacs. Within the thylakoids membrane are chlorophyll and carotenoids. The job of chlorophyll is to absorb solar energy. The absorption of solar energy for photosynthesis is called a “light” reaction. Complexes in the thylakoid membranes convert the solar energy from the sun into a chemical form useable in the stroma. Stroma is an enzyme-rich solution that takes an organic compound and carbon dioxide, and then reduces it to a carbohydrate using the chemical energy produced by the thylakoid membranes. ATP is also produced in the thylakoid membrane and is a source of energy for the plant to grow.

The carbohydrate produced by the stroma is the only energy source for most organisms on Earth. When consumers metabolize this carbohydrate, it is converted and released as carbon dioxide back into the atmosphere. Plants take in the carbon dioxide through stomata, which will be converted into a carbohydrate again. This relationship between producers (and photosynthesis) and consumers (and respiration) is a vital part of Earth’s life cycle.

In addition, it is important to note that photosynthesis is made up of two separate reactions. The first is “light” reactions, which were discussed above, and also “dark” reactions (Calvin Cycle). “Dark” reactions are light independent, which means they can happen during either sunlight or at night. The Calvin Cycle (“dark” reactions) uses the energy produced by the “light” reaction to reduce carbon dioxide with hydrogen and carbohydrate.

In this laboratory, we performed experiments that explored the importance of light, oxygen, chlorophyll, carbon dioxide, and stomata in photosynthetic reactions.

II. Procedure & Results

Necessity of Light for Photosynthesis

For this experiment, Geranium plants were kept in either light or dark for 48 hours prior to the laboratory. A leaf from each plant was tested for the presence or absence of starch by the following procedures:

I. First, we removed a leaf from a plant that had been kept in the dark for 48 hours and a leaf which had been exposed to sunlight for 48 hours. To distinguish the “dark” leaf from the “light” leaf, we cut the leaves into different shapes to tell them apart.

II. Next, we boiled both leaves in water for 10 minutes. This loosened up the cell walls in the leaf.

III. Then, we replaced the boiling water with alcohol and heated the leaves for 1 minute. The alcohol helped to pull out sugars from the leaf.

IV. Lastly, we placed the two leaves in a petri dish added an iodine solution. The iodine will turn the leaf bluish-black if starch is present, which will indicate the presence of sugars.

Release of Oxygen

Oxygen release may be used as a measure of the effect of light...

Other Papers Like Photosynthesis Lab Report

Bacteria and Antibiotics Lab Report

1591 words - 7 pages BACTERIA AND ANTIBIOTICS LAB REPORT Bryan Bennett Ms. Johnson Biology 09 period 8 March 12, 2013 Introduction: 1. Eubacteria -Has cell wall with peptidoglycan -They can live nearly anywhere on earth (sky to underground) -Unicellular -Prokaryotic -Reproduce Asexually Archaebacteria -Cell wall without peptidoglycan -Live in environments without oxygen (anaerobic) -Prokaryotic -Unicellular -Reproduce Asexually

Laptops Replace Textbook Essay

2508 words - 11 pages that students could not get into the library or lab to complete assignments, and students will be free to explore the ability of the technology more completely.  In fact, teachers may find themselves changing their method of teaching to best utilize the technology. Schools that implement a laptop program should employ technology people to teach students and teachers how to use them, to maintain the machines, as well as keep networks in order.  This

Global Warming and Mitigation

2815 words - 12 pages /science/indicators/ghg/ 06.21.2013, Overview of Greenhouse Gases found at Iver Peterson, March,30, 1985, Acid Rain Starting to Affect Environment and Politics in West found at Lab Research Report 2: Global Warming: Cause and MitigationDue Week 9 and worth 170 pointsAmong the

Dinoflagellate Algae

5064 words - 21 pages use all oxygen in the water and release CO2 in their process of photosynthesis. Algae is at the bottom of the trophic level, which means many larger organisms are affected by the tiny phytoplankton, especially the microscopic predator of dinoflagellate algae, zooplankton. Zooplankton are the primary food of many large ocean mammals and become contaminated when they enter an area covered by a toxic dinoflagellate bloom. Toxins are accumulated in

Freedom And Responsibility

2141 words - 9 pages directs the State Department to include in its annual global human right report, information detailing the state of press freedom and the extent to which governments are supporting or tolerating or are actually involved in violations”. Signing the law in an Oval Office ceremony, President Obama said it sends a solid signal about American rights regarding freedom of the press. “The Daniel Pearl Freedom of the Press Act requires the State

Hate Crime Laws

2348 words - 10 pages repeatedly beat him with they’re sticks. A man named George Holliday videotaped the whole thing from his balcony, andthe video got out other officers saw it. One of the officers only got suspended for 66 days in 1987 and the others got charged for filing false report, a mere misdemeanor. Unfortunately, North Carolina has already faced a similar dilemma that ended with the same kind of lax punishments. Laura Schneider, Michelle Smith, Loren Hyman

Rational Emotional Behavior Therapy Case Study Conceptualization And Treatment Plan

2140 words - 9 pages Rational Emotional Behavior Therapy Case Study of Sarah: A Conceptualization and Treatment Plan Rational emotive behavior therapy, REBT, was developed by Albert Ellis and holds the central belief that the events in our lives do not cause our disturbances but that they are instead caused by our view of the events (Murdock, 2009). Murdock (2009) states that “people are seen as responsible for their behavior” (p. 279) but, because they are

Holidays In Albania

1636 words - 7 pages Have you ever thought about having exciting and incredibly cheap vacations? Albania might be the right choice. According to My Travel Guide, Albania is ranked the fourth among ten places worth visiting in Eastern Europe (“Top 10 Eastern European Destinations”). One can encounter three kinds of vacations in this Mediterranean country: winter, summer, and cultural. The ideal places to spend your winter vacations are the Albanian Alps. They are

A Heart Of Darkness

1748 words - 7 pages In this short story, there are frequent significant subject and ideas that make the story, "A Heart of Darkness," by Joseph Conrad, and haunting novel. The main theme is absolute white power over the natives. The theme validates the corruption, and the dependence caused by the white people as they took over the Congo. White men were giving all the power; they had no self-control, and in the end they did not use wisely. The white men became

The Aspects Of Vulnerability Among The Exploited In Medical Research

2287 words - 10 pages Essentially, everyone is in some state of vulnerability. However, some of us are more susceptible to harm due to our vulnerabilities. The susceptible are the individuals with the greatest risk. These individuals risk the loss of their autonomy, and maybe even their lives. Vulnerable populations can be found in every subset of society. However, as previously mentioned, there are some vulnerable populations that are at an even greater risk than

The Hitchhiker’S Guide To The Galaxy

1171 words - 5 pages The Hitchhiker’s Guide to the Galaxy As the human race makes life-changing discoveries, it is made apparent that there is always more to learn as the universe, instead of becoming familiar, is becoming absurd. The Hitchhiker’s Guide to the Galaxy, written by Douglas Adams, as well as the 2005 film adaption, portrays absurdity to be an all-encompassing system in the universe. Through the introduction and attempt to understand lack of reason, the

Related Essays

Lab For Envbiroemnt Essay

1219 words - 5 pages Student Sheet Name: AMALISE CUBERO Instructor’s Name: Assignment: SCIE207 Phase 1 Lab Report Title: Understanding the Scientific Method: Photosynthesis and Cellular Respiration Instructions: Based on the virtual experiment, you will answer some questions and write a 1-page lab report using the scientific method. When your lab report is complete, submit this document to your instructor in your assignment box. Using what you

Scie207 Lab 3 Essay

601 words - 3 pages Assignment: SCIE207 Phase 2 Lab Report Title: Animal and Plant Cell Structures Instructions: Your lab report will consist of the completed tables. Label each structure of the plant and animal cell with its description and function in the tables provided. When your lab report is complete, post it in Submitted Assignment files. 1. Animal Cell: Observe the diagram showing the components of an animal cell. Using the textbook and

Independent Light Photosynthesis Essay

1532 words - 7 pages EFFECT OF COLOURED LIGHT ON THE GERANIUM LEAF (LIGHT-DEPENDENT REACTION OF PHOTOSYNTHESIS)BLG143Section number: 15Tuesday November 11th, 2014Sakina SardarID: 500450407TA: Brian HannaIntroduction"Photosynthesis is an endergonic suite of reactions that reduces carbon dioxide to glucose or other sugars," as it says on p. 189, Freeman, Harrington & Sharp (2014). This lab report discusses the experiment of effect of coloured light on the light

Lab Report Biotc460

2092 words - 9 pages Lab Report for AGRO/BIOTC460 LAB REPORT 5 NAME: M. Azrul Akmal Saharudin SUBMISSION DATE: May 3rd , 2011 Transgene Detection by Phenotypic Screening and Molecular Diagnosis Test. Abstract The introduction of Bar gene into maize and using phenotypic screening and molecular diagnosis test to detect the expression of the gene are one of commonly use method for transgene detection. We were using maize plant that was transformed with Bar