• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Biology Internal Assessment Peas Lab

Extracts from this document...


Internal Assessment Biology: Respiration in Peas Purpose: In this laboratory, you will observe how respiration and decomposition produce heat in peas. Apparatus: Boiled peas (cooled to room temperature) Peas (not boiled) soaked in water Thermos Stopper fitted with thermometer Balances Labels Methods: 1.) Select a known mass of boiled peas (or a known number) and add them to the thermos 1. Fill the thermos approximately half full. 2.) Carefully label the thermos with your group name and what the thermos contains. 3.) Fit the stopper and the thermometer so that the thermometer bulb is immersed in the peas. 4.) Select the same mass (or number) of soaked, but not boiled peas and add them to thermos #2. 5.) Repeat steps 2-3 for thermos #2. 6.) Record the initial temperature of each flask. Both should be at room temperature. Continue to record the temperature of each flask at constant intervals (make sure to make at least 2 measurements per day) for several days. 7.) Once you have seen a temperature change in both flasks, open the flasks and observe their contents. ...read more.


The most important of them being: Water, oxygen, temperature and light. When the soaked peas finally go through the process of germination, they speed up their rate of respiration. Energy (ATP) is released during respiration. This energy is used by the pea to sprout later on. Out of all this we conclude that the process of germination by which the peas speed up their respiration releases energy, and as we already know there is a lot of heat released simultaneously when the energy is released. This provides a good explanation to why the temperature rises inside the flasks of the non-boiled peas.1 In the other flask we had the boiled peas. Now these peas saw a short increase in their temperature, but afterwards the temperature started to decline. First we must consider the fact that these peas were boiled, which means they were killed (they are not alive anymore). The boiled peas go through the process of decomposition. The process of decomposition is the process by which tissues of dead organisms break down into simpler forms of matter. ...read more.


The temperature changed each time the window was open, letting in fresh air, making it a little bit colder, or a lot of lab devices like Bunsen burners were used and etc... that made the room hotter. Solution: Again try to find a room inside the school where the peas would stay in the same spot, in the same temperature uninterrupted. 4.) The amount of oxygen present in the room was another factor which wasn't considered well. The fact that each time the window is opened there is a sufficiently large amount of oxygen entering the room speeding up the respiration of the peas, and when the school is closed during the evening most of the windows are closed resulting in less oxygen being present in the room. Solution: You may want to again find a special room to do this, and open a window or provide some sort of way for fresh oxygen to enter the room in relatively the same amounts and keep it that way, until your experiment is over. 1 In Cellular Respiration. [Online]. [Cited on 10th May]. Available from world wide web:<URL: http://en.wikipedia.org/wiki/Cellular_respiration> 2 In Decomposition. [Online]. [Cited on 10th May]. Available from world wide web:<URL: http://en.wikipedia.org/wiki/Decomposition> ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Marked by a teacher

    Biology: Lab report Germination

    4 star(s)

    It is obvious that the seeds in a hot environment grew the fastest and perhaps the best. In the graph, one can also see that the cress seeds in a hot environment perhaps reached their limit.

  2. Marked by a teacher

    Osmosis Internal Assessment (Biology)

    4 star(s)

    5 iv. Variables Type of Variable Variables Units Range Independent Time given for osmosis to occur Hours ? 1 second 5hours, at one hour intervals (1, 2, 3, 4, 5) Dependent Percent change in the mass of the potato strips Percent (%)

  1. internal assessment vitaminC

    Add the juice, one drop at a time until the blue D.C.P.I.P is reduced to a colourless solution. 5. Repeat for the other juice samples, then repeat the whole procedure. 6. Calculate using the results obtain the concentration of ascorbic acid in each of the juice samples.

  2. IB biology Respiration IA

    1 30 22 52.00 33.00 28.81 Jumping Jacks 10.0 1 30 23 42.78 42.04 21.07 Jumping Jacks 10.0 1 30 24 42.00 40.00 20.00 Jumping Jacks 10.0 1 30 25 42.00 40.00 27.09 Jumping Jacks 10.0 1 30 26 35.16 25.49 20.00 Jumping Jacks 10.0 1 30 27 31.54 29.28

  1. Enzyme IA Biology

    It can be noticed that room temperature is closest to a human being's body temperature suggesting a reason for how enzymes work in the body of humans as well as how the human body allows for the function of enzymes.

  2. internal assessment rate of transpiration

    ABA triggers a metabolic pump which actively secretes potassium ions out of guard cells, causing the cells to lose water and become flaccid. The stomata will close and the rate of transpiration is slower. 3. High humidity of air will results in low rate of transpiration.

  1. The Effects of Salinity on Wheat Germination

    Method 1. Take the Petri dishes and separate them into halves so that there are, in fact, six dishes. 2. Place them on a table in a suitable area with little temperature fluctuation, some sunlight not that much as would cause the seeds to dry out and with minimum disturbance from insects and other factors.

  2. Investigating the Effects of Salt on Seed Germination

    RESULTS Results Table: Concentration of salt (NaCl) % Number of seeds germinated in 7 Days Total number of seeds Number of seeds germinated Percentage (%) 0.5 20 18 90 1.0 20 16 80 1.5 20 8 40 2.0 20 2 10 2.5 20 0 0 Graph: I think the best

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work