Why Do Leaf Disks Produce Oxygen The Fastest

This is important because any time stomata are open the plant will lose water along with oxygen (berkley) When enough carbon dioxide has entered the stomata, a plant will close its stomata so it can preserve its water and prevent itself from drying out. Environmental conditions can alter stomata density (Tansley reviews). In many species, stomata density is reduced with increases in atmospheric carbon dioxide levels in geological time and under laboratory conditions (tansley reviews). In a study of 100 different plant species, it was found that three quarters of the species analysed showed reduction in stomatal density (Tansley reviews). This would be an advantage for the plant as fewer stomata are better able to conserve water than its original

Additionally, it was difficult obtaining a piece of rhubarb that was thin and particularly red, therefore the effect could not be best observed in the cells. Part B: Design your own experiment Parts of this practical were taken and slightly altered from the following link http://www.markedbyteachers.com/gcse/science/investigate-the-effect-of-surface-area-on-osmosis-in-potato-tissue.html Aim: To observe the effect different surface area: volume ratios have on osmosis in potato tissue. Hypothesis: If the potato has a larger surface area: volume ratio, the quicker osmosis will take place and the larger the mass will be at the end of the experiment, therefore the difference in mass of the potatoes from the start of the experiment to the end of the experiment will be larger. Additionally, the potato pieces left in a saltwater solution will decrease in mass, whereas the pieces left in water will increase in mass.

Quinn Nguyen Floating Leaf Disk Photosynthesis Lab Conclusion: Graph your results for all 3 trials on one graph. Label the graph, both axes, and provide a legend to distinguish each trial. What was the rate of photosynthesis for each variable? How many leaves floated per minute? Rate of photosynthesis (leaves/min) Spinach: (2-0)/25 = 0.08

Purpose: The purpose of this experiment is to see how long it takes for the 10 spinach leaf discs to undergo photosynthesis and thereby rise in the two solutions. Hypothesis: All of the leaf discs in the sodium bicarbonate solution should be floating before the discs in plain water because the bicarbonate is a carbon source that will allow photosynthesis to continue. Background: Light is absorbed by leaf pigments (chlorophyll) which makes electrons within a photosystem moved to a higher energy level.

Hypothesis: If four lights (UV Light, LED Light, Infrared Light, and Blue Light) are used to perform photosynthesis on a spinach leaf, then the spinach will respond most to the blue light and perform a more efficient photosynthetic process.

For this lab I will be using water and sucrose to demonstrate the rate of osmosis. In this lab I will be exploring how temperature impacts the rate of osmosis by placing pieces of potato of equal size in solutions of different temperatures and observing the change in mass of potato after a given period of time. The change in mass will indicate the rate of osmosis.

The most important result from this experiment is that it suggested that the increase of Carbon Dioxide, will drastically increase the growth mountain maple in the covered (from the sun) parts in a forest, in the meantime any increase in the temperature of the soil will nullify the increase of light, as we know is to be the main ingredient for photosynthesis. 5. The authors do not use any citations in the

Observations about Data Table II and Graph II: Looking at Data Table II, it is representing the data presented in Graph II. Once the distance is calculated from light intensity (Data Table II). This implying that the rate of reaction is increasing as the source of light becomes more intense. A closer proximity is providing the plant with more energy and photons that will be converted into the production of glucose and oxygen. From point A to point B the graph is showing that when the light intensity increases so does a number of bubbles produced.

According to the group data, the hypothesis was proven correct; the leaf circles in the carbon dioxide solution surfaced more quickly than the leaf circles in the water did. This occurred because carbon dioxide is a reactant in photosynthesis, therefore the more it is present the more successful the reaction is going to

Introduction Photosynthesis is one of the most important sections of biology and has always interested me. This process is affected by many aspects which drove me to question if one can identify the effect of high and low light intensity specifically from leaves on any plant. The structure, dimensions and pigments of a leaf should (theoretically) all be indicators of the type of light intensity environment the plant is situated in. Light intensity is one of the factors affecting the rate of photosynthesis.

These enzymes have a secondary and tertiary structure and this could be affected by increases and decreases in temperature beyond the optimum temperature of the enzyme to work in. Mostly enzymes are highly affected any changes in temperature beyond the enzymes optimum. There are too

Along with being found in plants, they are also present in liver cells, kidney cells, leukocytes and erythrocytes. For the concentration of enzyme experiment, the hypothesis was if the concentration of an enzyme increases, then the enzyme activity will increase as well. The hypothesis was proven to be true, because there are more enzymes to react with substrates. For the enzyme—factors affecting, the hypothesis concluded was if the temperature increases, than the enzyme activity will increase. This however was proven wrong, because enzymes become unstable at higher temperatures.

Background Information: In this experiment I will be investigating the impact of light intensity on the rate of water uptake, due to transpiration, by attaching a shoot from a leafy plant in the capillary tube of a potometer, and then measuring how long it takes for a bubble to move a set distance. The faster the bubble moves, the greater the rate of transpiration. I will be placing one plant in an environment where it is exposed to high-light intensities, and another plant in an environment where it is exposed to low-light intensities. Transpiration is the process of the transport of water and nutrients up the the plant from the roots to the leaves.

RESEARCH QUESTION Which one has a higher rate or respiration between dicotyledonous (peas) and monocotyledonous (maize) seeds and what is the effect of temperatures (room temperature, 40, 60) on the rate of respiration as determined by oxygen usage estimated with a respirometer? AIM The aim of this experiment is to investigate which seed has a higher rate of respiration and how different temperatures (room temperature, 400C, 600C) affects the rate of respiration of dried, fresh and germinating monocotyledonous (peas) and dicotyledonous (maize) seeds.

This is because when catalase reacts with hydrogen peroxide, water and oxygen is formed (Mhamdi, Queval, Chaouch, Vanderauwera, Breusegem & Noctor 2010). Hence, as the concentration is not high, there will be less hydrogen peroxide for the catalase to catalyse, hence less oxygen will be produced and thus the leaf in the lowest hydrogen peroxide concentration solution will take the longest time to rise. Therefore, it was predicted that the leaf that would take the longest time to rise to the surface was the leaf in the 1% hydrogen peroxide concentration solution, and the leaf that would take the shortest time to rise would be the leaf in the 5% hydrogen peroxide