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GCSE: Green Plants as Organisms

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  1. I am going to investigate the light to find the effects of light intensity in the rate of the photosynthesis.

    Apparatus 1) One 1 litre of beaker 2) 800 ml of water 3) 5cm of one pondweed 4) One box to cover the beaker 5) One 100W lamp 6) One metre rule 7) One clip 8) One clock 9) One counter to measure the number of bubbles Method 1) Put 800ml of water in the 1 litre of beaker. 2) Put 5cm of pondweed in the water. 3) Stick the clip to the side of the pondweed 4)

    • Word count: 424
  2. Anaerobic Reaction of yeast

    If I added too much yeast it would be more too react with the Co2, this would slow down the particles and they would all be used up. As the amount of yeast increases there is more particles to collide with, and this would also use up all the glucose. Osmosis (osmosis occurs when glucose is added) The diffusion of solvent particles through a selectively permeable membrane from a region of high solvent concentration to a region of lower solvent concentration.

    • Word count: 1299
  3. Adaptations to cold conditions in Mammals

    The ratio of a polar bear - whose cube size is 150 - is very small; therefore its volume is prodigious. As the volume is immense, it requires a lot of cells to respire, make cellular respiration and therefore producing heat. The lizard has a larger ratio than a polar bear resulting in a smaller volume. The lizard does not need a big volume because it lives in a desert and it needs to lose heat not make heat. The lizard loses heat mainly by its skin.

    • Word count: 1487
  4. Investigation using thin layer of chromatography to separate photosynthesis pigment

    As the solvent travels up slowly up the chromatography paper, the different components of the ink mixtures are separated into different colours spot due to the ink travelling at a different rate. Different factors affect the chromatography movement such as temperature; solvent; mixture and polarity. Temperature affects the movement of chromatography as the temperature of the solvent can dissolve better in a chemical that?s been transported at higher temperature. The solvent can affect the chromatography movement as a solvent with a strong interaction for a specific chemical will more easily overcome any affinity for the absorbent layer.

    • Word count: 2032
  5. Note on Plant Nutrition and Transport

    * Leaves have a network of vascular bundles ? they are transport vessels xylem and phloem. They deliver water and other nutrients to each part of the leaf and take away the glucose. * The waxy cuticle stops water leaving by evaporation * And the leaf is great at gas exchange as there is a lot of space in the spongy mesophyll where the gases i.e. CO2can be exchange. Rate of Photosynthesis The three things that effect that rate of photosynthesis is CO2 and light intensity and Temperature, they can be limiting factors. A limiting factor is something that stops something for progressing i.e.

    • Word count: 1016
  6. Write a review of GM Crops for a newsletter, 500 words limit.

    Obviously, if there is an adverse effect on the Monarch butterfly population then the number of aphids will rise resulting in poorer crops. Scientists also fear that by modifying the genetics of the plant in order to produce B.t. (Bacillus thuringiensis (a bacterium which produces crystal proteins that are lethal to insect larvae))

    • Word count: 390
  7. Factors Affecting Seed Germination Lab - the effect of light

    Put the container near a window. 7. Cover one petri dish with a thickly folded piece of paper that covers the entire dish, and place a weight on top to secure the paper in place. 8. Note which petri dish is experimental, and which is control. (In this case, the one covered with the paper is experimental, while the regular dish is control.) 9. Leave experiment and observe changes daily. Data Control Experimental Seed # Tues. Wed. Thurs. Fri.

    • Word count: 791
  8. What are the benefits and drawbacks of cloning plants?

    Meristems are undifferentiated cells; ultimately the continuous cell divisions produce specialised tissues (i.e. xylem and phloem vessels), which go on to build the whole plant. How could farmers overcome the problems of cloning crop plants? One way in which farmers could overcome this problem is by sectioning out a piece of land for the other (non-cloned) plants to be grown. Maintaining the gene pool is paramount, due to the fact of susceptibility of diseases the farmers could rely on plants that survive any changes in the environment. Also, it is beneficial to clone 3 or 4 plants with positive characteristics.

    • Word count: 634
  9. Osmosis investigation. My prediction is that as the concentration of the solute increases, net flow will increase out the potato

    Ions and water can be lost by diffusion and osmosis, and heat can be lost at a faster rate. 2. A large cell has a small SA:V ratio and therefore exchanges molecules with it's external solution slowly, because there are less collisions with the membrane due to the smaller ratio. The factor I chose: I choose osmotic gradient as my independent variable, because it's the easiest variable from which to produce reliable, accurate and reproducible results. I didn't chose SA:V as the independent variable, because of the time it takes to prepare that amount of potato to meet a good standard precision, it would simply take to long to repeat the experiment for reliability.

    • Word count: 4689
  10. Which seed will germinate faster a corn or bean in tap water, salt water or sugar water?

    Before we do any thing put sugar water in one of the beans and one of the corns. 4. Lastly put them in a sunny spot and watch them grow for a few days. ________________ Observations: Date Observation Diagram September,27,2007 The tap water bean seed was opening. the corn seed is still the same. The salt water bean and corn seed are the same as the sugar water bean and seed. September,28,2007 The tap water bean seed stopped opening but didn?t die. The tap water corn got a little tail. the bean and seed Salt water started to rot the same as the sugar water bean and seed.

    • Word count: 774
  11. What is photosynthesis? Experiments that discovered the process.

    However air also touches plants but Greek Scientists were unable to see this. Van Helmont decided that plants gain mass by taking in water: In 1648 Van Helmont set up the following experiment: Dried soil, weighed it, and placed it into a pot. Planted a 2.2kg willow tree in to the pot with soil. He then added rainwater to the pot whenever it was dry. 5 years later Helmont removed the tree from the pot: The tree now weighed 76.7kg; therefore the willow tree had gained a mass of 74.4kg.

    • Word count: 492
  12. Experiment Report on Best Fertilisers

    It is also thought to counteract the effect of alkali salts and organic acids within a plant. Sources of calcium are dolomitic lime, gypsum, and superphosphate. Nitrogen, Phosphorus, Potassium and Calcium are all the essential nutrients usually added to help aide in the plants growth as when the plant grows it absorbs large proportions of each nutrient meaning that there will be near to none left, ending in a stunted growth, Gardeners and farmers add these nutrients to the ground to ensure there will always be enough for when the plant grows, the acidity of the soil is another reason why nutrients are added because the higher the acidic level of the soil the more nutrients will be lost.

    • Word count: 3342
  13. Arturo Escobar, es un antroplogo colombiano, nacido en Manizales, interesado en la ecologa poltica, el desarrollo y movimientos sociales en Colombia.

    Entre sus especialidades figuran la ecología política y la antropología del desarrollo, los movimientos sociales y las nuevas tecnologías. (Peñuela, M, 2005, http://www.javeriana.edu.co/Facultades/C_Sociales/universitas/62/penuela.pdf) Adicionalmente ha sido profesor de muchas universidades en Colombia y especialmente Estados Unidos. Este autor refleja en una de sus obras y ensayos uno de los más importantes y cuestionados temas a nivel mundial: la igualdad y conflicto en un mundo glocalizado. Se habla de la diferencia que existe entre los individuos que hoy hacen parte de la globalización, esta diferencia es pocas veces dirigida hacia una igualdad para todos, ya que la relación que existe entre la globalización, la cultura de un lugar especifico y el desarrollo benefician mas unos que a otros.

    • Word count: 836
  14. Germination experiment to study the effect of different amounts of water on seeds.

    Leave the beakers close to a good light source 5. After a week record the length of the stem of the plants in each beaker Variables: 1. Dependant: Height and growth of the plants 2. Independent: Amount of water 3. Controlled: Where the beakers are placed, amount of soil, amount of seeds, type of seeds, how often the plats are watered (Initially it was decided that the amount of water we would use would be 50, 100, 150, 200 and 250 ml but we decided to lower the amount of water so that the plants wouldn?t drown)

    • Word count: 685
  15. The life cycle of plants and adaptation to Alaskan conditions.

    The root now forms tiny lateral roots. Next the cotyledon forces upwards protect the tender leaves between them. The leaves are referred to as plumage leaves. When the leaves are up out of the ground they open and start to make food for the plant from oxygen and light. This is called photosynthesis. The cotyledons are not needed any more so they wither and fall off. The leaves grow and the stem starts to stretch upward. This stage of growth takes quite a while in some plants. The root system grows downward and outward to provide a foundation for the growing plant. After a while a bud starts to form.

    • Word count: 634
  16. The Discovery of Photosynthesis

    Helmont attempted to discover where a tree's growth comes from by growing a willow tree inside a pot with a carefully measured amount of soil. By weighing both the pot and the tree at the beginning of the project, Helmont believed he would discover that the tree gradually ate away at the soil by measuring the two again after five years. He hypothesized that the water would simply be used to carry nutrients and then evaporate. By the end of five years, the tree had added over 150 pounds of weight, but the soil lost only a few ounces.

    • Word count: 542
  17. Investigating: What is the best PH to have the fastest germination rate for green beans?

    Use a measuring cylinder and measure out 25cm³ of PH 2 solution and pour it in the first dish. Repeat the following step for each dish but only change the PH per dish. Remember to measure 25cm³ of each PH solution before pouring into the dish so that it would be a fair test. 5. Once all dishes have been completed, finish it off by putting the lid of the dish back on and leave it at the window for two days. 6. Once time is up, check and see if the seeds have been germinated.

    • Word count: 527

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