The smell is produced by volatile, a chemical that evaporates into the air. Volatile helps garlic from competition with other plants. Its smell hinders other plants which keeps plants away from competition with garlic (Allium Sativum). Other plants other than garlic such as broccoli and carrots have different effects on the environment. To find out if the Allium Sativum hinders the growth of other plants more than other plants such as carrots and broccoli is by experimenting on seeds contained in a sealed Petri dish and with it contained garlic crushed cloves, another sealed Petri dish contained carrot, another dish with broccoli, and another with the seed in the Petri by itself.
Essential oils Essential oil is a common name for fragrant volatile compounds extracted from plants. Common essential oils are citrus oil, rose extracts, mint and eucalyptus. Essential oils are found in more then 2000 plant species and they are present in various parts of the plants. They are produced by the plants and serve a wide spectrum of biological functions such as protection against natural parasites and predators, attraction of pollinates and inhibition of germination. Humans have discovered the essential oils early in history.
This is because tap water’s pH level is just over neutral (base). When vinegar is added to the cabbage, the cabbage will turn red. This is because there is a pigment (coloured chemical) in the red cabbage that acts as a pH indicator. Neutral Red Neutral Red is a dye used for staining histology (study of tissue under a microscope). Neutral Red also can be used as practical jokes.
IBDP HL BIOLOGY - PRACTICAL 3 The colour of Beetroot is due to the presence of a red pigment, betacyanin in the cell sap. As long as the cells and their membranes are intact (that is not damaged), the betacyanin remains inside the vacuoles in the cells. However, if the membranes are stressed or damaged, betacyanin will leak through the membranes and produce a red colour in the water surrounding the beet tissue. The intensity of this red colour will allow for the assessment of the damage produced by experimental treatment 1) Aim To investigate the effect of temperature on cell membranes in beetroot (Beta vulgaris) 2) Research Question How does the temperature of the water bath (30 °C, 40°C, 50°C, 60°C, 70°C) affect the absorbance reading and the amount of the betacyanin that leaks out of the cell membrane when factors like duration of experiment, number of discs of beetroot used, surface area of each discs and volume of water are kept constant? 3) Hypothesis My hypothesis is that the greater the temperature, the more betacyanin will leak out of the cell through the cell membrane as the cell membranes will be under more stress and be more damaged, the higher temperature will also result in a faster rate of diffusion.
Aim: To investigate on the activity of catalase. Introduction Catalase, an enzyme found in many different tissues, catalyses the breakdown of hydrogen peroxide into water and oxygen. 2H₂O₂ → 2H₂O + O₂ Hydrogen peroxide is a toxic substance that can be formed during aerobic respiration and catalase removes this product. The activity of catalase can be measured by finding the rate of oxygen release from hydrogen peroxide. Minced potato provides a suitable source of catalase and the pH is varied in this experiment using citric acid-sodium phosphate buffer solutions at pH values of 4.4, 5.2, 6.5, 7.5 and 9.
By standing too close to the sink it may spread any contamination to your cloths. Then, turn on the faucet and adjust the temperature so that the water is warm. If the water temperature is too hot or too cold it can dry out and chap your skin causing your skin to crack and cracked skin can allow infections into your body. Then, wet your hands by placing them under the flow of water, apply liquid soap, and work soap into a lather by rubbing your palms together and rub the soap in between your fingers for at least thirty seconds. Rubbing your hands together helps in the removal of microorganisms and other germs from the surface of your skin.
The invading organism causes symptoms, in part, by provoking a large immune response in the lungs. The capillaries become leaky, and protein-rich fluid seeps into the alveoli. This results in a less functional area for oxygen-carbon dioxide exchange. The patient becomes relatively oxygen deprived, while at the same time retaining large amounts of carbon dioxide. During this process, mucus production is increased.
Ringworm skin lesions normally begin as distinctive, reddish round areas of hair loss, which may progress to reddening, thickening and loss of pigmentation to other skin areas. The Centers for Disease Control and Prevention notes that rash can be dry and scaly or wet and crusty. Treatment • Infected areas must be kept clean. Treat with an over-the-counter fungal product, such as Lamasil. Prescription topical products or pills can be used to treat ringworm in severe cases.
Maya Chamseddine 9m3 Mrs. Anwar science It might be said: Introduction: Indicators are used to test alkalinity and acidity of various items. These items may be present as either an acid chemical solution, basic chemical solution or a neutral chemical solution. Acidic solution meaning any item with a high PH, connoting potential hydrogen, neutral meaning nor a high or low PH and base meaning an item with a low PH. We use a PH scale to measure the concentration of acidity and alkalinity in a chemical solution. It is determined that acids tend to loose their potential hydrogen easily whereas bases are more than likely to hold on to their hydrogen.
In solutions that are more acidic than pH 3.2, it is protonated to form a red dipolar ion. Thus, methyl orange can be used as an indicator for titrations that have end point in the pH 3.2- 4.4 region. The indicator is usually prepated as a0.01% solution in water. In higher concentrations in basic solution, of course, methyl orange appears orange. Acid-Base Indicator Properties of Methyl Orange [pic] Procedure Pretreatment before Diazotization 1.