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

GCSE: Green Plants as Organisms

Browse by

Currently browsing by:

Rating:
4 star+ (7)
3 star+ (12)
Submitted within:
last month (1)
last 3 months (1)
last 6 months (1)
last 12 months (1)

Meet our team of inspirational teachers

find out about the team

Get help from 80+ teachers and hundreds of thousands of student written documents

  • Marked by Teachers essays 56
  • Peer Reviewed essays 13
  1. 1
  2. 2
  3. 3
  4. 4
  5. 7
  1. Marked by a teacher

    Biology CourseworkTo determine if the distribution of flora across Ellerbeck is due to chance. The valley containing Eller beck possesses a huge variety of different species of plant life, particular species are often found in specific places

    5 star(s)

    I also plan to perform an interrupted belt transect along the same bearing. Laying down a quadrat frame on the left side of my tape measure at regular intervals of 10 metres and recording in detail, the distribution of species within the frame. This will give me a general view of the distribution of different species in many areas across the valley allowing me to sample the abundance and frequency of the different species, providing quantitative data and will allow me hopefully to speculate on the distribution of those species in the whole area.

    • Word count: 2444
  2. Marked by a teacher

    The effects of shade from trees on plants below

    5 star(s)

    A woodland habitat Within a woodland habitat the main dominating organisms are the trees. The reason for their domination apart from the fact that they are usually larger than most other wildlife is due to the fact that trees have large canopies of branches and leaves. The canopies are situated at the top of the trees therefore casting a shade on all that grows below it. Woods are described as Strasfied; this is because woodland areas are in layers and block out most of the light. Layer Description Canopy layer Ash, Oak, Elm, Cherry, Sycamore Shrub Layer Small trees growing under the canopy layer e.g.

    • Word count: 2231
  3. Marked by a teacher

    How the molar concentration of NaHCO3 (Sodium Hydrogen Carbonate) affects the rate of photosynthesis in Elodea.

    5 star(s)

    I will vary this variable so that I can discover if there is a proportional relationship between this and the amount of oxygen produced as a result of photosynthesis. Light intensity:- if the light intensity is increased, the number of bubbles produced by the Elodea will also increase which is why I have to make sure that it remains constant, so as to produce more accurate results. I will make sure that the lamp remains at the same distance from the Elodea by marking its position with a pencil.

    • Word count: 2028
  4. Marked by a teacher

    The Biological Importance of Water.

    4 star(s)

    Water does not only keep us to live and present, but it also helps very much in our life, and it is actually a very interesting substance to have a research about. Water is a liquid at room temperature; water dissolves more substances than any other common liquid. We can use it to take a closer look for biochemistry of life. Evaporation of water requires a great deal of heat. Which means that much heat is lost by evaporation of a small quantity of water.

    • Word count: 2173
  5. Marked by a teacher

    How does temperature affect the permeability of a cell membrane in a beetroot.

    4 star(s)

    Temperature also causes the lipids of the membrane to be more fluid. It also causes the proteins to denature. However as the proteins denature and the lipids become liquid like, bigger gaps emerge so larger molecules can diffuse more freely. As the proteins denature the protein channels will increase in size so that more hydrophilic molecules can diffuse through in a shorter space of time. Surface area of beetroot: The surface area of the beetroot is to be the same for each of the segments. The diagram below shows the shape of the segments: 1 2 Cylinder Surface area is worked out using the following formula: Area of end 1 + Area of end 2 + area of sides (cylinder shape)

    • Word count: 2745
  6. Marked by a teacher

    Investigating the water potential of potato

    4 star(s)

    Sucrose is also a safe material; therefore little precautionary measures need to be taken. One only needs to wear a lab coat to protect ones clothing, goggles are not needed. Sucrose is widely available and hence has been widely tested. The water potential of various concentrations have been found, this means that by finding the line of best fit, the point at which the line intersects the x-axis, the plant material will have an equal water potential to that concentration of sucrose. Firstly a set of concentrations of the sucrose solution needs to be chosen.

    • Word count: 2851
  7. Marked by a teacher

    Investigate which surface of a leaf loses more water by transpiration.

    3 star(s)

    Scientific reason for prediction The reason for my first prediction is that the underside is covered in stomata pores, making it possible for water to leave the leaf when the pores are open. On the topside however, there are no pores, just a waxy layer instead. This means that almost no water can leave the leaf via this particular surface. The process of evaporation through the stomata means that the plant can easily control the amount of water that it releases into the environment.

    • Word count: 2367
  8. Marked by a teacher

    An investigation into the relationship between heat loss and surface area to volume ratio

    3 star(s)

    Secondly I realised that the thermometer was placed free to move and that because of localised heat spots it was unable to measure the temperature properly. What I mean by this is that some areas of the water used to be hotter than others and if the thermometer came upon that area and moved on the temperature reading would vary. Therefore I decided to clamp the thermometer into place, thus ensuring that it doesn't roll through heat spots. The third thing which I noticed was the most crucial.

    • Word count: 2871
  9. Marked by a teacher

    Investigate the relationship between wavelength of light and the rate of photosynthesis using pondweed.

    3 star(s)

    Chlorophyll absorbs the sunlight and uses it to synthesise carbohydrates from carbon dioxide and water. This process is known as photosynthesis and is the basis for sustaining the life process of all plants. * The job of chlorophyll is to convert light energy into chemical energy. Chlorophyll absorbs the light energy and therefore enables it to be used for building up sugar. * The chlorophyll uses light energy to carry out photosynthesis and it can perform the process at the rate light is provided. White light made up of a range of colours or wavelengths called a spectrum.

    • Word count: 2977
  10. Marked by a teacher

    Science Investigation Into What Affects The Rate That An Aspirin Dissolves At In Water

    3 star(s)

    I will move up in ten-degree steps between each successive experiment from a range of 30-90�C. These temperatures will be easy to achieve, it would be harder to get colder temperatures and with temperatures higher than one hundred degrees the water will start boiling which will interfere with the fairness of the experiment. I will repeat the experiment at each temperature three times then take an average for greater accuracy. I will remove the water from the heat as soon as the required temperature is reached then drop the aspirin in, immediately starting the clock as it comes into contact with the water.

    • Word count: 2558
  11. 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
  12. 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
  13. 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
  14. The effect of growth medium on duckweed growth

    Duckweed plants grow best in nitrogen rich environments. This is especially high in polluted ponds. This means the plant is especially good in cleaning polluted ponds. Factors that affect the growth of plants The major difference between distilled water and that obtained from the tap; is that distillation removes the minerals that are found in tap water. Distilled water does not have the fluoride, chloride or trace amounts of sodium found in tap water. Soil contains a complex mixture array of minerals; it is this in combination with water, carbon, hydrogen, nitrogen and oxygen that forms the soil solution.

    • Word count: 2170
  15. Germination

    • Word count: 2156
  16. Free essay

    Orchid: Botany, Significant Species, and Requirements for Growth

    They vary in shapes and sizes ranging from long thin cylinders to round or even flat structures. They can be as small as a pea or as large as a tennis ball. Although the reason for this adaptation is unknown, many times in the wild ants will live in this "cavern". In this way, the bulb provides a home for the ants while the ants groom the orchid and keep it free from parasites and pests. Orchids which produce pseudobulbs have a different type of leaf structure than those orchids which don't. The sympodial orchids produce their leaves from the pseudobulb.

    • Word count: 2048
  17. How water uptake of a plant is affected by the number of leaves

    I am measuring the uptake of water not actual transpiration (water loss) because it is much easier. Measuring water loss is very difficult and requires specialist equipment. Water is lost through stomata on the underside of the leaves. Diagram of Equipment Factors that affect transpiration: There are many factors that I can change: * Temperature * Relative humidity * Light intensity * Light wavelength * Leaf area/ stomatal density* * Air pressure * Wind speed *This is the one we will change because it is the easiest most independent variable and there is a big enough change to measure as leaves are cut off.

    • Word count: 2259
  18. The effect that different concentrations of salt solution in the water has on strips of potato, due to osmosis

    I think this will happen due to the effect osmosis. Osmosis is the movement of water molecules across a semi permeable membrane from a region of high water concentration to a region of low water concentration. A semi permeable membrane is just one with very small holes in it. So small in fact that only water molecules can pass through them, and bigger molecules like salt can't. The water molecules pass both ways through the membrane in a two-way traffic.

    • Word count: 2759
  19. Germination lab _ siddharth nair

    + 6 H2O(liquid) + photons � C6H12O6(aqueous) + 6 O2(gas) Therefore, for the following experiment, we will see the effect of nitrates, phosphates and potassium ions in the form of weak mineral solutions on the growth of a plant. The nitrates are needed for the synthesis of amino acids, proteins, chlorophyll and nucleic acids. Phosphates are taken from the soil and are necessary for making ATP, DNA and RNA which are substances that store the plant energy. They are also needed for making phospholipids or membranes. Lastly, potassium ions enable homeostasis in the plants and cause the shrinking and swelling of plant cells.

    • Word count: 2612
  20. The aim of my experiment is to find out how light intensity affects the rate of photosynthesis in elodea (pondweed).

    Table of result (preliminary work) amount of sodium carbonate (g) Amount of water(HCl) (ml) Amount of pondweed (g) Time (min) Distance of length from the lamp (cm) Number of oxygen bubble given off 1st reading 2nd reading 3rd reading Average 3 1350 1.1 2 10 121 121 125 122 3 1350 1.1 2 20 67 52 61 60 3 1350 1.1 2 30 19 18 23 20 3 1350 1.1 2 40 15 18 21 18 3 1350 1.1 2 50 6 5 6 5 From my opinion I think this experiment was accurate enough to be the foundation for my main experiment because it gave me a good set

    • Word count: 2616
  21. Free essay

    Rate of photosynthesis

    The leaves are best for photosynthesis, because: * Leaves are thin and flat to provide a large surface area to catch lots of sunlight. * The palisade cells are near the top of leaf and are packed with chloroplasts. * The guard cells control the movement of gases into and out of the leaf. Light intensity Temperature, carbon dioxide and light intensity are factor that affect the rate of photosynthesis. At any given time one or other of the three factors will be the limiting factors, which are keeping the photosynthesis down at the rate, it is.

    • Word count: 2226
  22. Bottled Water Industry

    Per capita consumption in 2002 fell substantively below consumption rates in Western Europe, Middle East, and Mexico. Also the per capita consumption in United States was also lagged by a wide margin of soft drinks. There are top 5 leaders of bottled water brands of 2001 which consists of PepsiCo, Coca-Cola, Nestle Waters, Groupe Danone and final Crystal Geyser. The top leader in brand is Aquafina by PepsiCo which has a market share of 10% as compared to other competitors. The top 9 companies who are considered the leading U.S. Bottled Water Producers of 2001 was Nestle Waters with a market share of 32.5%.

    • Word count: 2725
  23. Free essay

    Biology Coursework

    Independent Variable: The light intensity is a dependent variable because the light intensity will be shone at different heights. This will help me to understand if the light shone at different heights will produce less starch or more starch. I strongly agree that this will prove my hypothesis Controlled Variable: Surface Area of leaf is a controlled variable because the leaf at this precise moment cannot grow in surface area because it is dead therefore it is controlled. The room temperature is a controlled variable because I can control the amount of temperature the plant gets because 24hrs before the

    • Word count: 2799
  24. Factors affecting Germination

    Seed Depth Optimum depth when planting the seed is 5 mm. Null Hypotheses (H0) Sunlight The optimum sunlight exposure for germination is full shade. Drainage No drainage provides better conditions than full drainage. pH Level A strong basic pH level is ideal. Germination Medium Soil provides the best medium to observe germination. Frequency of Watering Watering should not occur. Seed Depth Optimum depth when planting the seed is 5cm. Materials * 33 Germination pots (at least) * Vermiculite * Packet of Sweet Genovese Basil seeds * Bag of Mc Fothergill's seed raiser mix * Regular earth (dirt) from garden * Water * Materials for recording results (i.e. camera and writing equipment)

    • Word count: 2756

Marked by a teacher

This document has been marked by one of our great teachers. You can read the full teachers notes when you download the document.

Peer reviewed

This document has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the document page.

Peer reviewed

This document has been reviewed by one of our specialist student document reviewing squad. Read the full review under the document preview on this page.