Results of Lupinus arboreus experiments
These results show some of the results of parts of the experiments carried out by
students from my classes. These do not include observations, raw data or explanations of
processing of data. The graphs only indicate the type of results which one might expect to
get after carrying out some of the suggested experiments.
These are not necessarily the "correct" or "expected" results -
they are the results obtained when students designed and carried out their own
1. The effect of leaf age on the degree of leaf folding
In this experiment students measured the internal leaf angles of 50 mature and 50
juvenile leaves using simple cardboard templates so the angles could be estimated to
within plus or minus 5 degrees.
Thanks to Sandhya Deo for these results
2. The effect of shelter from sun and wind on leaf angle
In this experiment leaf angles were taken for mature leaves sheltered in the centre of
the bush and also from mature leaves which were exposed to the sun and moon on the top of
Thanks to James van Rij for these results
3. Investigating the factors affecting the maintenance of dormancy
Students were interested in which factors were the most important in maintaining
dormancy of the seeds of Lupinus arboreus. A number of different possibilities were
tested, the graph below show the germination rate for some of the factors investigated.
They used concentrated sulphuric acid and soaked the seeds for 5 minutes before rinsing
them in distilled water (supervision is required for this procedure).
Thanks to Ruth Trevathan for these results
4. Which surface of the leaflet has the greatest transpirational water losses
Vaseline was used to provide water-proof coverings on the different surfaces of the
leaf. Absolute weight losses were converted to percentage weight losses so the results
would be easier to compare
Thanks to Marlene
Wiryawan for these results