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Geotropism of a Bean Sprout

  • Date Submitted: 06/12/2014 04:34 AM
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Science Report
Would a bean shoot react to geotropism (gravity) if it were place on an angle?
As the petri dish is placed on a 0° angle, the roots of the seedlings will face in the opposite direction. This is due to geotropism; this means when a part of a plant- such as root or stem, detects the stimulus and either grows towards or away from the ground. Negative geotropism is when the plant stem will bend away from the ground. Positive geotropism is where the plant roots will grow towards the ground.
See on next page.
The results show that as the petri dish was turned onto a- 0, 90, 180 or 270 degree angle the plant root would bend in the opposite direction either bending down or up (this depend on the angle, when it would face up or down). This is because when a shoot or root is lying on its side, gravity produces auxin (plant hormones) to travel to one side of the plant, because of high concentration of auxin on one side the plant shoot would bend away from the ground and the root would grow towards the ground.
During the investigation inconsistencies were establish, day 4-6 were not recorded because the group was unavailable and by day six the stems and roots were not suitable to record because the roots and stems were all over the petri dish.
As the petri dish is placed on a 0° angle, the roots of the seedlings will face in the opposite direction; the results do support the hypothesis, as the roots of the seedlings did grow in the opposite direction when the petri dish was placed on different angles. This has occurred because of negative and positive geotropism.
Uncontrolled errors that could have been controlled affected the results of the experiment. Inconsistency of the amount of water that went into the petri dish could have been controlled because there was too much water which caused moss and mould on the seedlings; this could have caused disruption to the growth of the seedlings. To reduce this error there could...


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