The Full Story

Hi! I’m Will and I created a passive 5 figure passive income, within 5 years, through SEO and an effective blogging strategy. I share my incites exclusively on Ask Will Online.
dark

# How Height of Leaves on Holly Bush Affect Prickliness – Biology IAA

Within this post will be all you need to know for this IAA experiment. Once again, this experiment is boring and simple which means there must be no slip up in the method at all.

Firstly, we got to know what the independent variable and dependant variable is:

Independent variable – height of the holly bush
Dependant variable – length of leaves and prickliness

Independent variable) causes a change in (Dependent Variable) and it isn’t possible that (Dependent Variable) could cause a change in (Independent Variable). So, the height of the holly bush causes a change in the the length of leaves and prickliness.

Remember when setting out the graph, the independent variable ALWAYS goes on the ‘x’ axis while dependant ALWAYS goes on the ‘y’ axis. So for this case, the height of the holly bush would be on the ‘x’ axis and the length of leaves or average prickliness (I done average prickliness) is on the ‘y’ axis, because that is the variable you are not changing.

# How to measure prickliness

Number of pricks X height of tallest prick
So, if a leaf had 10 spines/pricks and the longest spine/prick was 1cm, to work out prickliness, you would do 10 X 1 which would give a prickliness of 10 for that leaf.

# Method

1. Identify a holly bush.
2. Using you hands, remove 10 leaves that are around the same length, size and colour at ground level from the outer bush.
3. Repeat step 2) but one meter up using a meter ruler to measure this, then two meters up.
4. Separate leaves into groups to help prevent leaves from being categorized wrong.
5. Using a 30cm ruler, measure leaves length ways to 1 decimal place and record results.
6. Measure the size of the longest prick on each leaf to 1 decimal place. Count the number of pricks on the leaf and times that number by the longest prick number. Record results.
7. Repeat steps 1-6 three times using different selection of leaves from the same holly bush at the same height.
8. Repeat steps 1-6 three times using 3 different holly bushes, all the same species found in the same area and time.
9. Ignore any anomalous data and repeat experiment to compensate for this.Your graph should look something similar to this:

The method was made valid by (The point/Explanation for the point)
Using the same 30cm ruler and meter ruler so results are recorded accurately
Use same person measuring as eye sight may differ affecting results
Same species of holly bush as different species will have different lengths of leaves and pricks
Location of the holly bush so that the three holy bushes we tested weren’t different in any way due to the environment
When we measure sample as leaf and prick size may differ in different seasons
Time of day we picked the leaves so the leaves are at the same growth.

The method was made reliable by
Measuring length of leaves and longest prick to one decimal place
Repeating the experiment
Ignoring any anomalous results and repeating to compensate
Measuring 10 leaves instead of 1
Way in which we removed the leaves
Placing leaves into groups to stop confusion

Conclusion
(this is where you should use your results and scientific knowledge)
As the leaves were collected further up the holly bush, the prickliness decreases. At 0 metres, the average prickliness was 226 while 2 metres up it was only 88 metres. This is to stop herbivores from grazing on the holly bush so the prickliness is higher to defend the bush against these herbivores.The holly leaves were longest at the top to get as much surface area for photosynthesis.

1. Jimeney Cricket April 25, 2011
2. Anonymous May 6, 2011
3. Will Green May 6, 2011
4. holly May 22, 2011
5. Anonymous May 22, 2011
6. Anonymous June 23, 2011
7. Will Green June 23, 2011
8. King pritvy June 23, 2011
9. Anonymous June 23, 2011
10. Anonymous June 23, 2011
11. Anonymous June 23, 2011
12. Will Green June 23, 2011
13. Anonymous June 26, 2011
14. Will Green June 26, 2011
15. Anonymous June 27, 2011
16. Anonymous June 27, 2011
17. Will Green June 27, 2011
18. nwaheed July 5, 2011
19. Will Green July 5, 2011
20. Anonymous July 7, 2011
21. Anonymous July 12, 2011
22. Anonymous July 18, 2011
23. Anonymous July 18, 2011
24. Anonymous July 18, 2011
25. Anonymous July 18, 2011
26. Jake the God July 18, 2011
27. Anonymous July 18, 2011
28. Grantly ;) July 18, 2011
29. Anonymous July 18, 2011
30. Anonymous July 18, 2011
31. Will Green July 18, 2011
32. Anonymous November 20, 2011
33. Anonymous November 20, 2011
34. Anonymous November 20, 2011
35. Anonymous November 21, 2011
36. Anonymous December 8, 2011
37. Will Green December 8, 2011
38. Anonymous December 22, 2011
39. Will Green December 22, 2011
40. Anonymous December 22, 2011
41. Will Green December 22, 2011
42. Anonymous December 22, 2011
43. Will Green December 22, 2011
44. Anonymous December 22, 2011
45. Will Green December 22, 2011
46. Anonymous December 22, 2011
47. Will Green December 23, 2011
48. Anonymous December 23, 2011
49. Will Green December 23, 2011
50. Anonymous January 2, 2012
51. Will Green January 2, 2012
52. Anonymous January 3, 2012
53. Will Green January 3, 2012
54. Anonymous January 21, 2012
55. Will Green January 21, 2012
56. Anonymous January 23, 2012
57. Anonymous January 23, 2012
58. Anonymous January 24, 2012
59. Mick Smith January 24, 2012
60. Anonymous January 24, 2012
61. Will Green January 24, 2012
62. Anonymous January 25, 2012
63. Will Green January 25, 2012
64. Anonymous January 29, 2012
65. Anonymous January 29, 2012
66. Will Green January 29, 2012
67. bob January 30, 2012
68. Will Green January 30, 2012
69. Anonymous January 31, 2012
70. Anonymous February 1, 2012
71. Will Green February 1, 2012
72. Anonymous March 10, 2012
73. Anonymous March 11, 2012
74. Will Green March 11, 2012
75. Anonymous March 12, 2012
76. Magsud March 20, 2012
77. Anonymous March 20, 2012
78. Anonymous March 20, 2012
79. Anonymous March 20, 2012
80. Will Green March 20, 2012
81. Anonymous January 21, 2015
82. Anonymous May 5, 2016

## Learning about Active Transport – Biology Revision

All metabolic processes like Photosynthesis, Respiration etc in the living organisms involve movement of substance in and out…

## Learning about Photosynthesis – Biology Revision

The plant cells are different from animal cells as they contain chloroplast which contains chlorophyll. All green plants…

## Biotechnology B3 Topic 1 Biology Extension GCSE – Everything YOU need to know

This article will cover everything you need to know for the extension topic Biotechnology in Biology GCSE. This…