I) Research Question: To what extent does light effect the rate of photosynthesis in green spinach leaves? II) Hypothesis: If the leaf is exposed to light in the presence of a Carbon source, then the leaf disks float to the surface of the solution due to an increased rate of Oxygen (O2) production through photosynthesis. III) Hypothesis Explanation: when light is absorbed by leaf pigments such as chlorophyll A or B, electrons within each photosystem are boosted to a higher energy level. Leafs then produce Adenosine Triphosphate (ATP) to reduce NADPH (ferredoxin), and incorporate Carbon dioxide (CO2) into organic molecules in a process called carbon fixation. When leaves are put in the water and undergo the process of the light-dependent reaction,
The experiment that we conducted were successful in exemplifying the effect of the presence of CO2on the rate of photosynthesis in leaf disks. As predicted, the leaf disks in the CO2 Cup were quicker to float to the top of the water. According to the data, the disks inside the CO2 Cup (higher concentration of carbon dioxide) have floated up continuously after 17 minutes, but disks in the Soap Cup (lower concentration of carbon dioxide) haven’t even started to float during the same period of time. But this doesn’t mean that the disks in the Soap Cup won’t be able to float up, they just need a lot more time to go through the photosynthesis process and then produce the
The variation of the concentration of sodium bicarbonate will have an effect on the rate of photosynthesis of spinach (Spinacia oleracea). As the amount of sodium bicarbonate increased the rate of photosynthesis also increased, this is because bicarbonate provides carbon dioxide (CO2) for the photosynthetic reaction which was also found in the experiment: An Assay Utilizing Leaf Disks (Guy, 1985). When completing this experiment there was one mane issue with our experiment that might have affected the results. The main issue that was faced was when the leaf disks were being exposed to the higher percentages of sodium bicarbonate while they were being vacuumed in the syringe. We found that the sodium bicarbonate was reacting with the leaf disks before they were placed
Doriana Spurrell What different frequencies and types of light would prompt the Spinach leaves to go through the process of photosynthesis effectively? Purpose: The purpose of this experiment was to see which of the four lights that range across the light spectrum would properly and most efficiently help the spinach leaf perform photosynthesis. Background Information: Photosynthesis is the process in which plants use light energy to transform into chemical energy. The process of photosynthesis is vital for the survival of most life on Earth. Without photosynthesis plant life would be unable to create its own food and sustain themselves causing them to die.
As a result, even in extreme temperatures, there wasn’t considerable change in amount of leaching because nearly all proteins were already damaged. In other words, all of the substances inside the spinach cells escaped outside because all proteins were damaged to create the maximum amount of ‘holes’ in the phospholipid bilayer. Since all of the substances in the cytoplasm were already out by a certain temperature, there would be little to no change if temperature increased further. This explains the plateau that starts to occur by 45ºC and
B. Floating leaves: This kind of features are often common. The leaves are broad and have lacunae which contains gas which can provide the leaves buoyancy so that they can flow on the water to obtain sunlight directly. In this case it can use abundant light to conduct photosynthesis and gain more nutrition. ii.
As oxygen was a visible product, we counted the oxygen bubbles made when we moved the source of light. Hypothesis: Plants need light to photosynthesize. In this experiment, the light intensity is changed by changing the distance of the source of light closer or further away from the elodea, so theoretically, when the intensity becomes stronger due to the light source being closer to the Elodea, the rate of photosynthesis should increase and
Haya Al-Khater Mr. Gurney Biology HL December 1, 2014 The Effect of Light intensity on rate of photosynthesis Research question- How does light intensity affect the rate of photosynthesis in Spinach leaves (Spinacia oleracea)? Hypothesis- My hypothesis is that light intensity and photosynthesis rate have a positive correlation. Meaning that as light intensity increases, photosynthesis rate will increase. This is because as light intensity increase, the rate of light-dependent reactions increase since light dependent reactions use light as an energy source. When light hits the surface of the leaf, it is absorbed by chlorophyll pigments.
Grishma Patel Chloroplast Pigments and Colored Light Absorption Summary The purpose of executing this lab was to see how different wavelengths and colors of light are absorbed by chloroplast pigments. The goal was to see the variations of light dependant reactions of photosynthesis based on different types of light. Spinach was used by grinding it with acetone and acquire the thylakoids used in the experiment. DCIP was used in this experiment as the oxidizing agent that will turn blue to clear when in contact with light. The experiment required us to test first the relationship between wavelength of light and absorbance.
Using the WoK of sense perception (specifically, sight), I passively observed the eventual growth of the tree over the years. As a student of my school for nearly 7 years, I am able to passively observe the many lives that occurs within my school campus, including the numerous changes (such as height or width growth and color change in leaves) that occur to the large banyan tree. In biology, it is understood that the tree would undergo a chemical process called photosynthesis to convert light energy to chemical energy for glucose and oxygen production, in order to enable growth. Using the WoK of reasoning, particularly inductive reasoning with regards to these two premises, I am able to realise and come to the conclusion that, even without intentionally observing, the tree has been growing throughout the year due to