Testing a leaf for starch is a common experiment in biology classrooms, as it allows students to understand the process of photosynthesis and how plants use energy. In this lab report, we will outline the materials and methods used, describe the results of the experiment, and discuss the implications of these results.
Materials:
Fresh leaf from a green plant
Iodine solution
Beaker
Test tube
Glass stirring rod
Dropper
Paper towels
Methods:
Obtain a fresh leaf from a green plant and gently wash it with water to remove any dirt or debris.
Fill a beaker with water and add a few drops of iodine solution.
Use a dropper to place a small drop of the iodine solution onto the leaf.
Observe the color of the iodine on the leaf. If the leaf contains starch, the iodine will turn blue or black. If the leaf does not contain starch, the iodine will remain yellow or orange.
Repeat the process with a few additional drops of iodine to confirm the results.
If necessary, use a glass stirring rod to scrape a small piece of tissue from the leaf and place it in a test tube. Add a few drops of iodine solution to the test tube and observe the color change.
Results:
In our experiment, we found that the iodine turned blue or black when applied to the leaf, indicating the presence of starch. When a small piece of tissue was placed in a test tube and mixed with iodine solution, the solution also turned blue or black. These results suggest that the leaf we tested contains starch.
Discussion:
Starch is a complex carbohydrate that plants use to store energy. It is produced during photosynthesis, when the plant uses energy from sunlight to convert carbon dioxide and water into glucose. The glucose is then converted into starch and stored in the plant's tissues, such as leaves, stems, and roots.
The presence of starch in the leaf we tested confirms that the plant is able to carry out photosynthesis and produce glucose. This is important for the plant's survival, as it allows the plant to store energy for times when sunlight is not available, such as at night or during periods of low light intensity.
Overall, testing a leaf for starch is a simple and effective way to understand the process of photosynthesis and the role of starch in plant metabolism. It also helps students learn how to use scientific equipment and follow experimental procedures, which are important skills for any aspiring scientist.
Is either person deficient in hemoglobin? Hint: think about what is in plasma versus what is on RBCs. The blood of a cancer patient undergoing chemotherapy is given an ESR test. Sickled red blood cells have an abnormal shape and do not tend to form stacks of cells rouleaux formation. You correctly answered: A person with type O blood has two recessive alleles and has neither the type A nor type B antigen. How can the ESR be useful in the evaluation of a female patient suffering from severe abdominal pains? Your answer: Blood sample 4 did not agglutinate with any of the antibodies tested because no antigens were present in the sample. How well did the results compare with your prediction? Iron is needed for RBC production.
Which blood sample contained the universal donor? You correctly answered: They have both A and B antigens on the surface of their RBCs, and their blood serum does not contain antibodies against A, B, or Rh antigens. Your answer: Sample 2: B+ Sample 4: B- Sample 6: B-. This could be due to the failure of the bone marrow to produce an adequate number of red blood cells. . You correctly answered: Because hemoglobin resides in RBCs, you would anticipate a low hematocrit level to coincide with a low hemoglobin level. EPO is a hormone that stimulates the synthesis of RBCs. Higher levels of testosterone lead to more EPO secretion and, thus higher hematocrit levels true or false.
It is necessary for the absorption of vit. Your answer: It is important to separate packed cells from the plasma and administer only the packed cells because it contains antibodies that can react with the recipient's antigens on RBCs. This allows more oxygen to be carried to the tissues. As a result, this would lead to an abnormally low level of hematocrit. Is the ESR test a specific test used to diagnose a disease? Your answer: The hematocrit for the female with anemia sample 6 is The average range of hematocrit for healthy females is Therefore, this individual has an abnormally low hematocrit.
Because there is less oxygen, the response would be to stimulate erythropoietin, increasing red blood cells or hematocrit. Stop Think Question 1 Why would the hemoglobin levels of an anemic patient be lower than the hemoglobin levels of a normal, healthy individual? If there enough iron available, the body cannot manufacture hemoglobin. How can the ESR be useful in the evaluation of a patient complaining of chest pains? Living in higher altitudes causes polycythemia as there are less oxygen in the air at higher elevation. Your answer: The hemoglobin level of the female Olympic athlete is higher than that of the healthy female, as predicted. Nobody is deficient in hemoglobin. Experiment Results Predict Question 1 Predict Question: Predict how the hematocrits of the patients living in Denver, Colorado approximately one mile above sea level , will compare with the hematocrit levels of the patients living in Boston, Massachusetts at sea level. The results show a slower ESR from the previous month.
B12 from the diet. You correctly answered: Higher testosterone levels in males promotes more RBC production. Lack of b12 leads to anemia. You correctly answered: cirrhosis of the liver. Your answer: The hemoglobin levels for the female Olympic athlete will be greater than those for the healthy female. Iron is crucial because a hemoglobin molecule needs an atom of iron for oxygen molecules to bind.
The history indicated that HTN has been part of J. Your answer: The hematocrit for the male with aplastic anemia sample 5 is The average range of hematocrit for healthy males is Therefore, this individual has an abnormally low hematocrit. What is the value, in terms of grams of hemoglobin per 100 milliliters of blood, for the Case Study 6: Heart Disease J. Give one possible explanation for this. Review Sheet Results To determine the amount of hemoglobin in a blood sample You correctly answered: All of these answers are correct.
You correctly answered: polycythemia. Pernicious anemia is due to a lack of vitamin -- B12 7. Your answer: The universal donor is type O- and it was in sample 4. Review Sheet Results i PhysioEx Exercise 11 Activity 1 level while Boston is at sea level. The respirations are a compensation of the elevated BP. It is elevated in confirmed myocardial infarctions 14.
Your answer: Sample 5 contained AB+, which is the universal recipient. M also presents with an elevated blood pressure as well as Heart rate. You correctly answered: hemoglobin Hb. Why would a diet deficient in iron lead to anemia? ESR, the measuring of the settling of blood cells in a vertical stationary tube of whole blood during one hour can indicate the following: elevated in iron-deficiency anemia, menstruating females evaluate a patient with chest pains because the patients ESR is elevated in established myocardial infarction heart attack but normal in angina pectoris chest pains without myocardial infarction useful in screening a female patient with severe abdominal pains because ESR is not elevated within the first 24 hours of acute appendicitis but is elevated in early stage of PID or ruptured ectopic pregnancy. Your answer: No, cause polycythemia means increasing the number of erythrocytes. Erythropoietin Erythrocyte Sedimentation Rate ESR 10. Why do you think this is done? Your answer: A, clumped; B, unclumped; Rh, clumped.
Your answer: The kidneys response to a chronic decrease in oxygen is secreting more erythropoietin, a hormone that stimulates red blood cell production, causing a higher hematocrit. Preview text PhysioEx Exercise 11 Activity 1 PhysioEx Lab Report Exercise 11: Blood Analysis Activity 1: Hematocrit Determination Name: Conner Farris Date: 14 December 2020 Session ID: Quiz Results You scored answering 4 out of 4 questions correctly. How does deficiency of intrinsic factor lead to pernicious anemia? The decrease in Hematocrit and Hemoglobin will also contribute to the BP because the heart has to work harder to pump the blood to the body, and the blood is not carrying enough oxygen to deliver throughout the body. PhysioEx Lab Report Exercise 11: Blood Analysis Activity 4: Blood Typing Name: Assema Missanova Date: 2 March 2021 Session ID: session-db6e4c33-0aab-b518-bd74-f29572571d Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. It is elevated in cases of early acute PID.
