• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
  21. 21
  22. 22
  23. 23
  24. 24
  25. 25
  26. 26
  27. 27
  28. 28
  29. 29
  30. 30
  31. 31
  32. 32
  33. 33
  34. 34
  35. 35
  36. 36
  37. 37
  38. 38
  39. 39
  40. 40

Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

Extracts from this document...


Introduction One of the most familiar wild plants is the dandelion. It is, however, a troublesome plant that is a weed in lawns and gardens. The dandelion lives throughout the temperate zones. It is a perennial, surviving winter and re-growing in early spring. It blooms in spring and summer. The roots may be up to five feet (1.5 meters) deep. The deeply lobed leaves grow out from center close to the ground. The best way to get rid of dandelions in a lawn is to use a weed killer. They also may be pulled, but it is necessary to loosen the plant so that the entire root comes out. Dandelions belong to the composite family of plants. The blossom is actually a bouquet of about 150 to 200 tiny flowers set in a solid head on a receptacle. Each flower is a perfect seed-producing floret. As the small, dry, one-seeded fruits mature, they push up a feathery structure called a pappus on a threadlike stalk. All the pappi together make up the blow ball. The wind takes the seeds and scatters them far and wide. Dandelion greens are a delicacy in the spring when the leaves are tender and fresh. They can be boiled or eaten raw in salads. The word dandelion comes from the French dent de lion, meaning 's tooth. The scientific name is Taraxacum officinale. Picture number one shows a fully blossomed dandelion, these are most likely to be seen in early spring. Picture number two represents a picture of a group of dandelions. This picture is more precise as you can see the green leaves. They are easy to identify, as they resemble the holly leaf. To the suburban homeowner this deep-rooted wildflower may be nothing more than a pest, an unsightly blight in the lawn. Yet nutritionists prize dandelion greens as a rich source of vitamins A and C, and in fact this brings $300,000 to $400,000 annually to the farmers of southern New Jersey, who supply dandelion greens to produce markets throughout the country. ...read more.


> Soil samples were taken using a spoon and soil pot. This will be used to take the soil samples of the soil. You only need a small amount of soil. Once you have retrieved this you may place them in their pots. Be sure to do this every time you place you quadrat on the ground. > Once the first 20 soil samples were collected all the pots were placed in a bag, and labelled. Where you have attained these samples. > Be sure to wear gloves when you are taking pH samples. Our body pH is 5.5; therefore if you perspire you may distort your results. Remember this is apart of your control variable. > To measure soil depth you had to take your knitting needle and place it in the ground. Push as hard as you can. When it does not go deeper into the ground, you now that this is the furthest that it will go. Then take it out, and measure how far the mud mark is on the needle. For accuracy reasons, it would be better to measure this in mm. > Then you must take the light intensity reading. All you need to do is stand where you took your co-ordinate and then take the reading. Record this on your table. > This method was repeated on the 2nd lawn, on the other desired site. Which will be the shaded or unshaded, depending on what ground you implemented your experiment first. Back at the lab, the soil samples were tested for pH. > Collect all of your soil samples. They must be in two separate polythene bags, one for the shaded area and one for the unshaded area. > Take your first soil sample and place it in the beaker. > Add a small amount of distilled water, to the beaker, to convert it into a solution. ...read more.


And the soil depth did not meet the requirements. When I was doing my experiment in Templeton Lawn I noticed that there was a large oak tree. When I researched oak trees I found out that there roots are very large, and compete with the entire dandelion population. Even though the dandelion is naturally competing species I do not think that it would compete against a large domineering oak tree. The oak tree must have affected the dandelions abundance slightly, as it must have been up taking all the nutrients by active transport. I felt that I could improve on my accuracy in certain areas. For example, I wanted to investigate the soil temperature. However, this was a limitation as their was no type of equipment to investigate this, I had to investigate the air temperature and use this. I do not feel the external temperature was the same as the internal temperature. Therefore this is a limitation. I believe that my results are quite valid overall. As my background, knowledge did also support my results. But I think that my results are not very accurate, as I did not investigate some important factors, such as nitrate level in the soil, and the moistness of the soil, which I feel is quite important, and could affect the abundance of dandelion between the two sites that I was working on. Appendix These arrows represent the dandelions that were present on the trampled area, on the lower lawn. This is a picture of the lower lawn. The arrow represents the unshaded area. This is where I implemented my first experiment. This picture represents two of my peers collecting soil samples. We used the spoon, and placed the soil sample in the vile. Then placed them in a polythene bag. When the wind blows the seeds away, they land on the ground, and then grow into dandelions. This was found on the Lower Lawn. These are often known as parachute seeds. This is a picture of a fully blossomed dandelion. Experiment number one was implemented at this site. Lower Lawn. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Home Economics - Why is nutrition important to sports people?

    5 star(s)

    * Isotonic- the drink is the same concentration as your body fluid, e.g. 'isostar'. These drinks are ideal for fluid replacement during exercise and are therefore the most popular type of sports drink. * Hypotonic- the drink is a weaker solution than your body fluid e.g.

  2. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    duckweeds on the tile without water this could lead to the weeds drying out, and become damaged easily, due to it's small size and as I was finding quite a large number of particular shaped weeds which took me a quite a long time.

  1. Marked by a teacher

    Biology coursework investigation: Comparing the length of ivy leaves (Hedera helix) in areas of ...

    4 star(s)

    The changes in cloudiness throughout the day are another factor affecting light intensity and would result in varying light levels being exposed to the area under investigation. The intensity of light of the shaded area was 2500 arbitrary units and the brighter area had a light intensity of 5000 arbitrary units.

  2. Daphnia Investigation

    After caffiene is ingested, enters the blood stream after being absorbed through the stomach and small intestine. Here it travels throughout all tissue types, and can increase the levels of the enzyme cAMP in heart cells. This enzyme is responible for activating protein kinase A, which increases the responsiveness of cardiomyocytes to the calcium currents that control beating.

  1. Compare and Contrast the Interactions Between a Forest and a Grassland Biome

    supporting over 40 species of large herbivore such as wildebeest, zebra and antelope, as well as several carnivores; both predators such as cheetahs and scavengers such as hyenas. Most of the animals on the savanna have adapted to the climate in some way; many burrow underground to avoid the heat

  2. Effect of temperature on the hatching success of the brine shrimps

    count the sea monkeys that had survived as they were very small which means there is a possibility that we could have counted or accidentally missed out some hatched brine shrimps, the fact that it is also possible that we were counting a dead brine shrimp just floating around.

  1. Yeast Coursework

    of these is cyanide ions block the active sites of enzymes involved in respiration. Apparatus This experiment requires several pieces of equipment, which are as follows; Test-tube rack, 2 test-tubes, Large flask of yeast, Large flask of sucrose, 2 measuring cylinders, Plastic beaker, 2 polystyrene cups, Thermometer, Bung, Delivery tube,

  2. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic in the Vertebrates.

    Endotherms can do certain things on a bigger, faster scale, but only at a price. This is the requirement that they must take in large amounts of food and often water. Whilst endotherms are able, usually, to maintain a constant elevated internal temperature independent of the physical environment (unlike ectotherms),

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