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International Baccalaureate: Biology

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  1. Deteremining The Effect Of Substances On Membrane Of A Cabbage Cell

    Substance added to cabbage discs pH (±) Color Distilled water 6 slightly violet NaOH (1mol/dm³) 14 yellow HCl (1mol/dm³) 1 red Ethanol 5/6 purple only right around the cabbage discs near the bottom; clear on top of liquid Cabbage discs boiled in distilled water 5/6 purple, but less intense color than the red or yellow Table 2: Raw data collected by Bolayır’s group on color change of cabbage in different substances with average pH obtained. Discussion As we conducted our experiment using heated distilled water, ethanol, HCl, NaOH, and distilled water we had the opportunity of observing how different substances with different properties and even under different conditions affected the membrane of a cell.

    • Word count: 1164
  2. (IB) Ecology Observation Report. The tree that Ive chosen to observe from March to June is located between the playground and the Main Hall

    From research, I have found a web article illustrating on method of classifying pines[1], which belong to Class Pinus. I am not yet certain whether or not ?X? belongs to Class Pinus, but this article may serve as blueprints for formulating my own dichotomous key. Initial Observations My initial observations on Mar. 27th provided me with basic knowledge about Tree ?X.? ?X? has needle-like leaves whose color ranges from olive yellow to dark green. Yellowish leaves tend to be more located to the bottom of the tree whereas the top has mostly dark green leaves.

    • Word count: 1666
  3. Do the different dilutions of yeast cell suspension affect the number of yeast cells per cm3 that counted using haemocytometer under the microscope?

    This is because when more distilled water used, the smaller the ratio of yeast suspension to distilled water become. It means that the less yeast cell suspension will occupy the dilutions per cm3 as the yeast cell suspension get more diluted because the yeast cells had been widely distributed. Variables Independent variable : Different dilutions of yeast cell suspension which are one-to-hundred dilution (1/100), one-to-one thousand dilution (1/1000), one-to-ten thousand dilution (1/10,000), one-to-hundred thousand dilution (1/100,000) and one-to-one million dilution (1/1,000,000).

    • Word count: 1627
  4. What is the color of pigment that can be found in green plants at different wavelength using a colorimeter?

    Qualitative data: Mustard: 1. The green mustard was put into the boiling water and then it become softer than it was before. 2. The mustard was grind using a mortar until it become it form of paste. 3. When it was in that form, it released an odor that can be smell. 4. The colorless acetone was added and grind together. 5. Then, the solution produce was transfer into centrifuge tube and after the process using the centrifuge was done, the layer between supernatant and the precipitate which both are green in color.

    • Word count: 1339

    ________________ Mean= sum of all data values/the number of data values. ________________ this is the formula of standard deviation. It measures the Spread of the data values from the mean. ________________ CONCLUSION Figure 1 showing cell membrane structure From the graph it is evident that as the temperature increases, the % transmission of light through the solution(distilled water and anthocyanin) decreases.Therefore it can be deducted that temperature is one of the factors that affect the diffusion of anthocyanin because the amount of anthocyanin diffused in the distilled water was dependent on the temperature level the sample was in, for example at 45°c,the % light transmission was 99.4%(0.6% absorption)

    • Word count: 1013
  6. Biology Investigation - Comparing the populations of two plant species in same area.

    Research question: Which species is more populated in the IB MCKK compound? Aim: To compare the population sizes of Mimosa Pudica and Chrysopogon aciculatus (Retz) Trin in IB MCKK compound. Hypothesis: Mimosa pudica will occupy larger areal coverage in IB MCKK compound than Chrysopogon Aciculatus (Retz) Trin. IB MCKK compound is a windy area and populated with many small butterflies. Using insects and wind as medium of pollination, this is such an advantage for the growth of Mimosa Pudica populations in this area.

    • Word count: 1452

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