• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15
  16. 16
    16

Biology Investigation - Comparing the populations of two plant species in same area.

Extracts from this document...

Introduction

´╗┐Mohamad Zulhilmi bin Azmi Biology HL 2012 Comparing the populations of two plant species in same area Introduction: Mimosa Pudica or also called sensitive plant or touch-me-not, is a prostrate to semi erect herb, 0.3 to 0.8 m tall, often forming a small compact bush about 0.6 m tall; branches glabrous or pubescent, heavily armed with broad-based, black-tipped recurved thorns. Leaves are small, sensitive, bipinnate; leaflets about 16 pairs; petioles up to 4 cm long. Inflorescence of axillary headlike spikes, flowers pinkish, sessile. Pods usually in a dense cluster, 10 to 15 mm long and 4 mm wide, flat, segmented, somewhat constricted between the articulations, one-seeded segments[1]. Being called as Grass seed and Love grass, Chrysopogon Aciculatus (Retz) Trin is a vigorous creeping grass with stout, tough rhizomes, the culms ascending to 45 cm. Inflorescence a small panicle, 7.5-10 cm long, with numerous slender branches. Spikelet is narrow. Awn is bristly, short and fine. The branches at first ascend almost vertically, spread obliquely at flowering and then bend upward again at fruiting. Each branch has three spikelet at its tip, one sessile and two pedicels[2]. An experiment will be carrying out to compare the population sizes between these two species which live in the same area using quadrant sampling technique. ...read more.

Middle

Trin sp 3. The result was recorded in the table 4. Repeat the experiment 9 times in the same pre-determined 25m2 area to get the mean value. Safety and Ethics: 1. Do not touch, disturb or killed any living creature in the area. This measure was taken to prevent the creature from being endangered besides avoid us from being harm by the creatures. 2. Handle and throw the quadrant slowly with care to avoid damage on the quadrant. Data Collection and Processing Raw data: Mimosa Pudica Chrysopogon aciculatus (Retz) Trin Population 1 Population 2 Population 3 Population 4 Population 5 Population 6 Population 7 Population 8 Population 9 Population 10 Areal Coverage/m2 (±0.01m2) Quadrant Mimosa Pudica Chrysopogon aciculatus (Retz) Trin 1 0.33 0.10 2 0.29 0.09 3 0.31 0.07 4 0.30 0.07 5 0.27 0.11 6 0.27 0.08 7 0.43 0.05 8 0.24 0.07 9 0.15 0.13 10 0.23 0.10 Processed data: Areal Coverage/m2 (±0.01m2) Quadrant Mimosa Pudica Chrysopogon Aciculatus (Retz) Trin 1 0.33 0.10 2 0.29 0.09 3 0.31 0.07 4 0.30 0.07 5 0.27 0.11 6 0.27 0.08 7 0.43 0.05 8 0.24 0.07 9 0.15 0.13 10 0.23 0.10 Further processing Mean 0.090117 0.023594 Standard Deviation 0.055854 0.014623 95% Confidence level 0.034618 0.009063 T-test,t 0.000375 Degrees of freedom= (10-1)+(10-1)=18 At confidence level of 95%, the critical value for 18 degree of freedom is 2.101. ...read more.

Conclusion

The use of camera is not really effective. Under sunlight, it is quite hard to take the pictures of the quadrant because the exposure can affect the quality of the picture taken. When the pictures are affected, it is hard to calculate the areal coverage of the two species. The number of quadrants is little. The minimum quadrants produced a not really clear result by also affecting the mean and standard deviation. The range of data can also affected the t?test value. Suggested Improvements: In order to reduce the error from unclear 25m2 pre?determined area, we should use string and nails to mark the area before the experiment. Measuring tape can be use the measure the length and width of the area which is 5m x 5m. By doing this, the probability for throwing the quadrants outside the pre?determined area will be little or zero. Do not use the camera for taking the picture of the quadrant. Do it manually. The areal coverage of the two species will be clearer and can be count easier using this method. The errors can be reduced. The number of quadrants shall be increase to 30 quadrants. This can minimise the error on the result whereas the mean and standard deviation will be more accurate. Large range of the data can produce a better t?test value which can show a clearer significance difference between the two species. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. In this extended essay I am looking at the effect of different kind of ...

    Remember to prepare the soil and follow the steps as told in variables 9- 12 if necessary. 10. Once the seeds have germinated, take all the seeds and bury them (4 cm inside the soil) in the cup filled with soil and water them equally on a regular basis.

  2. Environmental Factors affecting plant growth

    * The fourth treatment contained tubes that contained 25% of complete sach solution and 75% of sach solution without phosphorus. The tubes of this set were each filled up with 6ml of complete sach solution and 16ml of sach solution without phosphorus.

  1. Biodiversity Investigation The aim of this investigation is to determine plant biodiversity of both ...

    Do this 10 times. Actual Investigation 4. Using the numbers obtained, determine placement of the quadrats, the numbers being the distance from the starting point. For example, a value of 27 means that you should place your quadrat 27 metres from the starting point (zero).

  2. Measuring the diversity of plant species in an area.

    Add all of the 5 quadrats (which equals 180); add up the raw number of plants found in each quadrat to get the number in all 5, then divide that by the total area of all 5 quadrats (36*5=180). That will give the population density for every square meter.

  1. Experiment Colours of Light (Wavelength) absorbed by green plant

    T2: Percentage of Absorbance in trial 2 (nm) T3:Percentage of Absorbance in trial 3 (nm) N= Number of trials E.g: The calculation of the average percentage of absorbance of wavelength (nm) for the spinach sample exposed at 440 nm (With respect to standard solution at 0.00nm)

  2. Yeast Population

    apply to all of the trials, keeping the results as accurate as possible. Type of Weight Scale: In order to weigh the sugar that we used in the experiment, I used the same type of weight scale. This was to decrease the inaccuracy as possible, just like that of the beaker above.

  1. How does the salinity of water affect the germination of mung been seeds as ...

    Although plants require Na+, in excess this mineral can begin to have toxic effects on the plant that affects it capacity to germinate. Excess salt can cause ?reduced cell turgor and depressed rates of [radicle] ? elongation... Furthermore, high intracellular concentrations of both Na+ and Cl- can inhibit the metabolism

  2. Ecological studies of rice (Oryzae Sativa) populations

    Table 3: Visual characteristics of the two populations of rice used in experiment. Population A Image Population B -Thinner / smaller width -Longer in length -Wider / larger width -Shorter in length Table 4: Lengths/cm (±0.01cm) of 30 randomly selected rice grains from two different populations of Oryzae Sativa, mean length/cm (±0.01cm)

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