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GCSE: Living Things in their Environment

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  1. Marked by a teacher

    Measurement of the vitamin C content of fruit juices

    3 star(s)

    Vitamins are group of organic substances quite unrelated to each other in their chemical structure. The features shared by them all are: * They are not digested or broken down for energy * Mostly, they are not built into the bodily structures * They are essential in small quantities for normal health * They are needed for chemical reactions in the cells, working together with enzymes Method: 1. Use a syringe to measure exactly 1 cm� of DCPIP into a test tube. Stand the test tube in a rack without shaking. 2. Fill a syringe fitted with a needle with 1 cm� of 0.1% solution of vitamin C.

    • Word count: 1402
  2. Peer reviewed

    GAS EXCHANGE

    5 star(s)

    � Because the respiratory surface must supply O2 and expel CO2 for the entire body, the structure of a respiratory surface depends mainly on the size of the organism, whether it lives in water or on land, and by its metabolic demands. � An endotherm has a larger area of respiratory surface than a similar-sized ectotherm. � Some animals, such as earthworms and some amphibians, use the entire outer skin as a respiratory organ. � Just below the moist skin is a dense net of capillaries.

    • Word count: 510
  3. Peer reviewed

    Are Blue-Green Algae Bacteria?

    5 star(s)

    In this essay I aim to show the similarities and differences between Cyanophyta and bacteria using points of comparison, to answer the question whether Blue-Green Algae can be classed as bacteria. Blue-Green algae are prokaryotic, unlike the rest of the algae family, which can also be said for bacteria. Most of bacteria and Cyanophyta can only be seen through a microscope because they have only one cell and are around 1�m in diameter. In both bacteria and Cyanophyta, the cells have rigid walls.

    • Word count: 704
  4. Peer reviewed

    Lab- Response Time

    4 star(s)

    Hypothesis: I hypothesize that humans who belong to age group 10- 25, will have a lesser reaction time when compared to humans belonging to the age groups :- below 10 and above 25. Plan Variables Dependent Independent Controlled * Response Time * Age of human conducting experiment * Time of day * Apparatus(ruler) * Gender Apparatus: - * 1 x 30 cm ruler * 'Distance of ruler drop to Reaction time' Conversion graph * Results table * Stool Fig 1 Conversion graph Fig 2 Method 1.

    • Word count: 833
  5. Peer reviewed

    Is Genetic Engineering Desirable?

    3 star(s)

    In the old human history, it was almost impossible to redesign existing plants or organisms but now through this biotechnology we can create more varieties and wanted traits in an organisms/plants. The genetic modifications of foods may also improve their taste/nutrition, thus their rate of growth. Moreover, scientists can also acquire traits we want in a plant or animal by alternating their DNA. If we wanted bigger apples or redder apples we can genetically modify them to make them that way.

    • Word count: 567
  6. Peer reviewed

    Science in the News: Should old people be allowed to drive?

    3 star(s)

    Putting more money into the local economy, adding to the Multiplying effect. > It they drive a car, they will pay money towards having it cleaned, giving money to car cleaners. Against (They shouldn't be able to drive) > Poorer eyesight is very common with older people. [15] > Adds to Global warmer. [16] > Uses fossil fues > Slower reaction time as you get older. [2] and > Saves money as petrol is rising. [17] > It is more sociable to go on a bus and talk with the community. > Could put others in danger.

    • Word count: 969
  7. Peer reviewed

    How the dinosaurs became extinct

    3 star(s)

    Asteroid Theory Probably the most popular theory right now is the Asteroid Theory. According to this theory a large asteroid or comet collided with Earth about 65 million years ago. Scientists think that such a large collision would throw so much dust into the air that sunlight would not be able to shine and plants and animals would die. The dramatic changes in climate that resulted from this huge collision were too much for the dinosaurs. They were not able to survive.

    • Word count: 651
  8. Peer reviewed

    Should whale hunting be banned?

    3 star(s)

    Most countries around the world accepted the moratorium and stopped commercial whaling. Some of the countries who declined the moratorium are Norway, Japan and Canada. Japan and Canada declined this because in some rural areas of the countries food supply is low, so it would have a social impact if it was banned. It will also have an economical effect as people require whale hunting to provide a wage. IWCoffice.org Argument Against One argument by Wikipedia against whaling is the safety of eating the whale meat.

    • Word count: 920
  9. Peer reviewed

    The Use Of Enzymes In Industry

    3 star(s)

    As cheese is made from raw material milk, the milk has to be warmed and these two enzymes added in order for the milk to form 'curbs and whey'. The product of this is a cloudy thick liquid containing high quantities of sugars and proteins which is then poured into containers whilst it matures.[7][1] Starch is the raw material from which alcohol is now made from. First of all the starch is pressure cooked which gelatinises it, then the alpha amylase breaks down the gelatinised starch which then forms shorter molecules.

    • Word count: 1019
  10. Free essay

    Animal testing essay

    3 star(s)

    After I have done this I will again give my opinion on the subject. The first argument against animal testing is that; In a laboratory for animals, all sorts of animals, such as cats, rats, dogs, mice and chimpanzees, can be found. The animals are locked in small cages individually, kept away from the natural world of where they should have belonged. In addition, they may be connected to wires or may look aberrant because they are infected with "human diseases." Animals need to be in their own environment and it is very cruel to test on them.

    • Word count: 1312
  11. Peer reviewed

    Scientists map bacterium genome

    3 star(s)

    RESPONSE I believe that having this genome map of this commonly used bacteria "streptomyces" is an excellent opportunity for scientists to discover cures for many of the sicknesses and cancers that live amongst many people.

    • Word count: 287
  12. Peer reviewed

    endangered panadas

    In 2005 China had over 50 panda reserves, protecting more than 4,000 square miles and over 45% of remaining giant panda habitat. Today 61% of pandas are under protection in reserves, roughly 980. To help save the pandas more bamboo forests should be created, and China should focus on having all pandas protected. Giant pandas are an endangered species normally found in China. The main reason that they are dying out is lack of food. Giant Pandas consume between 26 - 83 pounds of bamboo a day, and it doesn't grow quickly.

    • Word count: 652
  13. Investigating Seed Germination. Hypothesis If there is water, oxygen and a suitable temperature in the surroundings, then the seed will germinate.

    Water serves as a medium for transport of soluble food molecules, but without oxygen, there will be no transport of nutrients at all. With oxygen, the seed will be able to use the starch and oxygen to produce energy (glucose) until it produces green leaves for photosynthesis. The suitable temperature varies for different type of seeds. The temperature range for seeds to germinate can range from 5�C to 30�C. In this case, the green bean seed that is being planted would be germinating at room temperature (15�C to 25�C).

    • Word count: 2808
  14. In a world where many people do not have the sufficient amount of food (under-nourished), what could we do to reduce this problem?

    Therefore we must turn to alternatives and find solutions of solving world hunger in this world and the answer is not MEAT! Some solutions could be becoming a vegetarian, eating fish, fruits and vegetables can be other ways and sources of food we can use instead of meat to allow everyone in this planet to have a balanced diet and not be mal-nourished. The less proportion of meat we eat the more people we can feed and also allow more people to have the right nourishments.

    • Word count: 689
  15. Science in the News: Should old people be allowed to drive (essay, .doc)

    Also elderly people may feel intimidated on a bus, because of teenagers and load noises; they would feel more secure in a privately owned car. From an economical point of view it is essential that the elderly should drive a car because this provides extra money to the government because of road tax. 9% of the population are elderly [8] , and if we stopped them driving then the government would make less money, also petrol stations would make less money as the elderly aren't purchasing petrol.

    • Word count: 956
  16. Animal behaviour and research into attitudes on animal testing.

    Primary stimuli are obvious and straightforward. For example, an animal may want to seek shelter if it's raining. The rain will be the primary stimulus. The animal may be able to predict rain beforehand if there are dark clouds. This would be a secondary stimulus. When animals enter the world, the first animal they see they assume is their parent, and they towards it for food, shelter and protection. This is imprinting. Its propensity to learn new things means that it's in a sensitive period where event happening then will have a big effect of the animal's later life.

    • Word count: 5739
  17. Should whale hunting be banned?

    Sea Shepherd, guided by the United Nations World Charter for Nature, is the only organization whose mission is to enforce these international conservation regulations on the high seas. For One of the biggest reasons in favour for a ban is the conservation of whales. Many see killing whales to the extent or near extinction is morally wrong.

    • Word count: 532
  18. The Effects of the Re-Introduction of Predators into an Eco-system.

    This meant the river's current was too fast and affected the aquatic creatures living there. What may happen to other parts of an ecosystem if the predators are re-introduced? The other parts of the ecosystem might be controlled and stabilised by the returning predators. Like in the wolves' example, when re-introduced the elk population was controlled and brought down to a reasonable amount. Which meant the elk didn't eat as many trees and therefore let the trees grow more making the forests look better.

    • Word count: 542
  19. I am writing to inform you that due to the rising levels of greenhouse gases, Global warming has made our planet at risk. This letter will be about how global warming is affecting our planet and how it is starting to affect our people. I will also inform

    This is because more children by being born in those countries. The level of CO2 has also risen at alarming rate. Due to factories, cars, aeroplanes and landfills more CO2 and other greenhouse gases is getting emitted into the Earth's atmosphere and absorbs the infrared ray from the sun and reflects it back into the Earth. This is called The Greenhouse effect. The Greenhouse effect is vital for life as the Earth temperature would be very cold, however too much of Global Warming is extremely bad because it can cause many problems like sea levels rising, more natural disasters, more diseases which can lead to people dying.

    • Word count: 1276
  20. Describe different ways in which animals can communicate and give some examples of each.

    What happens during and after the mating flight of the honeybees? - But here's the short story: a queen is selectively bred in a special "queen cell" in the hive and fed royal jelly by worker bees to induce her to become sexually mature. A virgin queen that survives to adulthood without being killed by her rivals will take a mating flight with a dozen or so male drones (out of tens of thousands eligible bachelors in the colony).

    • Word count: 738
  21. Explain what is meant by thermal pollution and discuss the implications for life if a body of water is affected by thermal pollution

    levels as well as water temperature, as shown in the diagram, posing significant implications for aquatic life. In the United Kingdom, it is estimated that one half of all river flow is used for cooling purposes and hence elevated water temperatures. Direct thermal shock creates severe stresses on aquatic ecosystems including depressed dissolved oxygen content, decreased biodiversity and the redistribution of organisms in the local community. Increased water temperatures raises the metabolic rate of aquatic organisms, this escalation of enzyme activity leads to organisms taking in greater quantities of nutrients and gases, hence altering the balance of a species composition which can lead to migration as they adapt to changed thermal conditions.

    • Word count: 529
  22. Neanderthals. Neanderthals had a stocky and short appearance. They were commonly around five to six feet in height. Neanderthals walked upright. Their bones were thick and sturdy

    The oldest Neanderthals just past the age of 30. Scientists have successfully completed the sequence of the Neanderthal genome. This has made history as being the first time the entire genome of an extinct hominid had been sequenced. Scientists now believe that this new information will help us determine how similar we are to Neanderthals through examination of our genes. Additionally, this research will help us identify the genetic changes between current Homosapiens and Neanderthals, which are linked to the development of the features of modern humans.

    • Word count: 540
  23. Free essay

    Revision Notes. Adaptation and Competition. Examples of extreme adaptations:

    which enable them to survive in the conditions in which they normally live * The organisms that are best adapted to make use of their resources in a habitat are more likely to survive and increase in numbers * For example: o To be able to obtain a certain food better. o To make it more difficult for predators or grazing animals to catch them or eat them.

    • Word count: 463
  24. The Human Diet: Natural or artificial? I believe our human diet is mainly artificial. The majority of food production is all processed and have been in contact with fertilisers and pesticides.

    Whereas foods which have been in contact with fertilisers and pesticides are known to be artificial. Modern farming methods now intend to increase the production of food to increase crop yields and to produce food faster. After the First and Second World War, there wasn't enough food to go around for everybody and so people were starving. Farmers needed to come up with an idea to produce more food at a faster rate. As a result, fertilisers were introduced. Fertilisers and pesticides increase food production.

    • Word count: 659
  25. Polwarth Sheep. This report will discuss the background, history, production uses and characteristics of Australias dual purpose sheep breed, The Polwarth. Also a recommendation of where the sheep is best suited to the environment.

    It was named after Polwarth the region near Colac in Victoria (www.historysmiths.com.au, 1999). The first breed was 75% Merino and 25% Lincoln bloodlines (www.ansi.okstate.edu, 2010). "They were developed in an attempt to extend the grazing territory of sheep because the Merino was found lacking in hardiness in this respect" (www.answers.com, 2010). Polwarth sheep are large, their wool is quiet fine also they produce a lean quality carcass www.breedersales.com, 2009). The Polwarth Sheep breeders Association of Australia was formed in 1918.The studbook was closed in 1948, since the breed was guaranteed to maintain its genetic purity (www.breedersales.com, 2009).

    • Word count: 774

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