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GCSE: Green Plants as Organisms

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  1. Marked by a teacher

    Factors Affecting the Rate of Photosynthesis

    3 star(s)

    The plant on which the theory and prediction will be tested will be Canadian pondweed. Aim: The aim of this experiment is to investigate how light intensity affects the rate of photosynthesis in Canadian pondweed. Variables: VARIABLE TYPE OF VARIABLE HOW MONITORED Light intensity Independent The distance between the plant and the light source will be carefully measured with a ruler Concentration of carbon dioxide Control The water will be saturated with sodium hydrocarbonate to ensure no change Temperature Control The room temperature will be constantly monitored using a thermometer Moisture Control The humidity of the classroom will be kept constant throughout Section of plant Control The same section of plant will be used for each observation Time Control A stopwatch will be used to ensure that each observation is only one minute No.

    • Word count: 852
  2. Marked by a teacher

    Factors That Affect the Rate of Photosynthesis

    3 star(s)

    Changing it to more or less can affect our experiment because the amount of chlorophyll changes the rate either faster or slower depending on how much you are using. Using more can help speed up the rate as there are more chlorophyll, using less can slow the rate as there are less chlorophyll to help photosynthesize. Therefore, when we change the plant, the amount of chlorophyll will also change. -Type of Plant: We need to control that we use the same type of plant throughout the whole experiment.

    • Word count: 4538
  3. Marked by a teacher

    Advantages and disadvantages of fertiliser.

    In a forest, the decomposing leaves and bark will feed the soil and give ferns (growing below the trees) enough fertilizer to live on. However, in a garden where you grow vegetables or flowers, these plants typically consume large quantities of fertilizer.. higher amounts than nature can naturally re supply. in order for the plants to grow properly, they need the right amount of fertilizer available in the soil. If there is too little, growth may be stunted and flowers and fruits may not develop properly.

    • Word count: 1402
  4. Marked by a teacher

    Investigate the effect of moisture content on wheat grain seeds respiration rate.

    VARIABLES: The independent variable used in this experiment is going to be moisture content, and the dependent variable will be the respiration rate. The other variables; temperature, air pressure and air will be kept at fairly constant levels. Carrying out the experiment inside a fume cupboard will help achieve in keeping these variables to remain constant. However another variable sunlight cannot be controlled during this experiment, and will obviously vary during the experiment. The possibility of using a standard light bulb to keep light levels constant was considered, but was rejected due to safety fears e.g.

    • Word count: 1524
  5. Marked by a teacher

    Determine the effect that temperature has on the rate of diffusion of food coloring in water.

    They are controlled by measuring out the amounts of each until they reach a set quantity. Therefore there is not too much or too little of the water or food coloring, which could cause an irregularity in the results. The water temperature is another controlled variable. The temperature of the water could vary, and has an effect on the rate of diffusion, which would therefore create uncertainty in the results, but it can be regulated by using a thermometer so that this does not happen.

    • Word count: 851
  6. Marked by a teacher

    Investigating the rate of cooling water in a beaker.

    The time period for the whole experiment, which should be 30 minutes. 5. The interval to measure the temperature of water in the beaker, which should be 1 minute. 6. The room temperature, this could be done by performing the experiment in the same room and on the same day. NEWTON'S LAW OF COOLING AND HOW WATER IS AFFECTED BY HEAT: One of the more unusual and more important properties of water is the ability to absorb a lot of heat before the temperature of the water increases.

    • Word count: 2386
  7. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of Woodlice:

    5 star(s)

    Thus there will be a positive correlation between light intensity and the speed of movement. My Ho hypothesis is that there will be no significant correlation found between light intensity and the speed of movement. Consequently, I will use the Spearman's rank correlation coefficient statistical test or the Product Moment correlation coefficient, depending on the distribution of my data, in order to test this hypothesis. The distance values that I will use for my experiment, which will alter the light intensity, will be 10cm, 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm and 100cm as this will enable me to

    • Word count: 6388
  8. Peer reviewed

    How the Mass of Plant Tissue is Affected by a Range of Water Concentrations

    5 star(s)

    Therefore the more water in the tissue the higher the mass will be. The plant tissue will absorb the water through a process called Osmosis. Osmosis is the movement of water molecules from an area of high concentration to an area on low concentration through a partially permeable membrane. Osmosis does not need any energy because the water molecules can easily fit through the membrane. Osmosis will enable the plant tissue to take in water as there will be a lower concentration inside the cells than outside.

    • Word count: 1631
  9. Peer reviewed

    Water is a molecule composed of two elements of hydrogen covalently bonded with one element of oxygen

    5 star(s)

    The hydrogen bonds also allow water to have high surface tension. This happens because, although one hydrogen bond is relatively weak, when many of these bonds are formed between two molecules it causes the bonds to be sufficiently strong and quite stable. Hydrogen bonding also influences cohesion, the clinging of a water molecule to itself or adhesion, the clinging of a molecule to another molecule. Water is known as the "solvent for life" or the "universal solvent". Water is a good natural solvent because it exits in the liquid state in its natural habitat.

    • Word count: 750
  10. Peer reviewed

    Impact of Enzymes in Society

    4 star(s)

    He produced the first specimen rennet by extracting dried calves' stomachs with saline solution [5]. People have been using enzymes unconsciously for ages in their food and drink, such as cheese, yoghurt, bread, beer, wine and others. In grapes, for instance, which are used to make wine, there is a natural form of fungus, called yeast. The enzymes in yeast break down glucose into ethanol and carbon dioxide gas in absence of oxygen. This process is called fermentation [4]. In Japan, an old tradition, Koji, was used for production of certain foodstuffs based on soya protein and fermented beverages.

    • Word count: 1245
  11. Peer reviewed

    planning for photosynthesis coursework

    4 star(s)

    My prediction for my final results will be that to see if the bubbles given off are the same in size, in my preliminary work I can clearly see that this prediction wasn't correct. For my final experiment I will keep my distance ranges the same and also keep my timing for 2 minutes the same as I did in my preliminary results. My aim is now to see if my results will change or stay similar even though I have not changed my method.

    • Word count: 2270
  12. Peer reviewed

    Plan for Anaerobic Respiration in Yeast

    4 star(s)

    I will make sure that The amount of yeast (1.5g) The amount of sugar (3g) The amount of water (50ml) Are all kept the same. I will also repeat my experiment twice for each temperature and take an average of the results so that my results are more accurate. Preliminary work Before I conducted my experiment I decided to conduct a preliminary experiment to test whether it would work. I wanted to see whether the bubbles of Carbon Dioxide were produced and could be detected by the method I was planning to use. I set up the equipment like I would in the experiment and put 3g of sugar, 1.5g of yeast and 100ml of water at 40 C (roughly body temperature)

    • Word count: 1096
  13. Peer reviewed

    Effect of Temperature on Beetroot Membrane Proteins

    4 star(s)

    Controlled Variables The surface area and mass of the beetroot cylinders may also affect the rate at which red pigment leaks out. This means that the cylinders must be as similar as possible in size and shape. They will all be as close as possible to 2.5cm long and will be extracted using the same cork borer. Any pigment that is on the surface of the beetroot before it is put into the water will affect the results. To avoid this, the beetroot cylinders should all be rinsed and lightly blotted on tissue paper During the experiment, the lids on the water baths will be removed and replaced.

    • Word count: 1405
  14. Peer reviewed

    Transpiration stream

    4 star(s)

    Root hair cells have a high surface area to volume ratio to efficiently absorb water. As water enters root hair cells, it has three routes for it travel along symplastic pathway, apoplastic pathway and vacuolar pathway. In the symplastic pathway water crosses the cellular membrane of root hairs and enters the cytoplasm of the cell, it travels between connecting cells through the plasmodesmata, this process occurs due to diffusion of water molecules from high concentration to low concentration. However the process is quite slow.

    • Word count: 951
  15. Peer reviewed

    Osmosis Coursework

    3 star(s)

    The process of diffusion is how we can smell an open bottle of perfume from the other side of the room. Perfume Particles Air Eventually these two types of particles will mix to become evenly concentrated about the room. Osmosis is similar, in a way that water molecules move through a semi-permeable membrane, to where water is least concentrated from where it is most concentrated.

    • Word count: 344
  16. Free essay

    The Affects of Light Intensity on the Rate of Photosynthesis

    3 star(s)

    3. Fill the test tube with water, and put the plant in the tube. 4. Make sure that the plant, which was put in the test tube fully, sinks in the water. 5. You need to wait two minutes before you can start counting the oxygen bubbles. 6. Make sure that you use the same plant for every experiment. 7. Make sure that the temperature is the same, for accurate readings. 8. As soon as the two minutes is over, you start the oxygen bubbles. 9. After the second five minutes are over, turn on of the lamps on, and wait for wait another two minutes.

    • Word count: 699
  17. Peer reviewed

    Photosynthesis Simulation

    3 star(s)

    30 seconds 1 9 30 20 2 9 30 22 3 9 30 26 4 9 30 30 5 9 30 33 6 9 30 34 Experiments Carbon Dioxide Concentration Time to taken to measure the oxygen bubbles in seconds Number of Oxygen bubbles Produced every 30 seconds 1 10 30 21 2 10 30 23 3 10 30 26 4 10 30 27 5 10 30 31 6 10 30 32 Variables: Independent: in this investigation two factors will be changes, carbon dioxide concentration and light intensity.

    • Word count: 552
  18. Peer reviewed

    an evaluation of the impact of glaciation on human activity

    3 star(s)

    The development of Sima has affected the flow of water that flows to the falls. In the summer the discharge of water was 12 meters per second so it is a spectacular site. This second example is a negative. This negative is to do with the increasing and improved roads that had to be built. The transport rout have been increased and improved because when Sima was being built you can't just have one single road you have to have lots of roads connected to each other like the a and b roads we have in Norfolk.

    • Word count: 857
  19. Peer reviewed

    Osmosis in potato and apple

    3 star(s)

    3 Initial volume of plant tissue 'chips': this will be kept the same using a core borer. 4 Initial length of plant tissue 'chips': this will be cut to 50mm 5 Initial mass of 'chips': this is difficult to control, however each 'chip' will be the same mass and to 2 decimal place. 6 Plant tissue type: all the samples will come from the same type (and age) of potato/apple to ensure that the investigation is kept fair and accurate.

    • Word count: 2088
  20. Biodiversity Practical. My prediction is that the location with the greater amount of plant population and biodiversity would be the one with the least human intervention

    (Data to be recorded in percentages) 4) In order to improve accuracy and reliability of data, take three separate readings for each location. When choosing where to place the quadrat in the given area, opt for a random procedure, such as picking a number from one to ten from a hat, and taking that many number of steps to the left/right (whichever would be more appropriate). 5) Repeat Steps 4 & 5 for the other two locations. 6) Be sure to record your results on a table, and once all raw data is collected, work out the averages and create a separate column for them in your table.

    • Word count: 1376
  21. The purpose of this investigation was to determine what effects different pH levels, more specifically pH 3, 5, 7 and 9 have on the rate of growth of plants.

    This topic is of high relevance and interest in the 'real word', as plants are a source of oxygen and food which are the necessary for not only humans and animals to live but to maintain our planet Earth. Therefore by investigating what pH level increases a plants rate of growth, we can gain a greater knowledge and understanding which will thereby enable us to grow plants sufficiently thus maintaining our planet as well as adequate food and oxygen. Growth in plants occurs chiefly at meristems where rapid mitosis produces new cells.

    • Word count: 5648
  22. Testing a leaf for starch experiment

    The green leaf was first immersed in boiling water for roughly 10 seconds. The leaf was removed and placed in a test-tube which was about one-third filled with ethanol and the test-tube was placed into the water bath. The leaf was boilt until became colorless and was then removed and rinsed with waster. The leaf was then placed in the Petri dish and a little iodine solution was porn unto it, it was then left alone for a few minutes.

    • Word count: 414
  23. Free essay

    How Plants Produce Food

    Broad to give a large surface area for absorbing sunlight 2. Flat and thin with air spaces between cells to allow gases to circulate between cells easily 3. They contain large numbers of chloroplasts to trap sunlight energy 4. They have networks of veins to allow water to reach all parts of the plant 5. They are thin and flexible to allow them to bend rather than break Limiting factors Anything that slows photosynthesis is a limiting factor, since plants need carbon dioxide and light and require warmth for reactions to occur these can all be limiting factors.

    • Word count: 794
  24. The amount of sunlight there is affects how much starch is there in the leaf so I think the leaf with sunlight will have starch but the one without will not have any starch

    Materials (Apparatus): 1.2 plants 2. Plastic bag 3. Beaker 4. Test tube 5. Lighter 6. Bunsen burner 7. Tripod stand 8. Wire gauze 9. Thermometer 10.Alcohol 11.Water 12.Iodine 13.Dropper Diagram Method Use two identical plants and put one of them with a lamp. 1. Cover one plant with black plastic bag. 2. Wait for several days. 3. Prepare all the materials needed for the experiment 4. Set up the equipments. 5. Take one leaf from the both plants. 6. Put the beaker filled with hot water on the wire gauze. 7. Turn the valve to open. 8. Light the lighter.

    • Word count: 660
  25. Free essay

    Transport in flowering plants- Dye Experiment 2. Aim: To find (a) the tissue responsible for the transport of water. (b) the rate of transport of water in a leafy shoot.

    The plant was left in a brightly lit and airy area for 30 minutes. 4. The shoot was removed and transverse sections of the stem were prepared at every 1 cm intervals. The presence of the coloured stain was recorded using a table. 5. The sections were observed using a hand lens in the same sequence as they were positioned in the stem. The position of the last section containing the stain was found out. The distance of water transported within 30 minutes was represented.

    • Word count: 1260

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