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Biology Phototropism in Wheat Sedlings Essay

These seedlings showed maximal growth in the experiment and grew to be around 5-CM in length. This was due to the fact that red light is the longest avalanche and as such shoots absorbed the light, resulting in a strong growth response. Furthermore, these plants were relatively healthy, however did not display a vibrant green colour due to the fact that they were left out in the sun, without adequate water supply for too long. The control group, was the seedlings placed in the box with a no filter on top, and these showed no bending in response to light, but instead growth upwards.

Additionally, the hypothesis stated that seedlings would not respond as favorably to blue and green wavelengths of light and to an extent, this was portrayed. Seedlings exposed to green light only showed a slight response to the light, whereas plants in the blue wavelength surprisingly thrived in these conditions and displayed quite moderate growth. This is as a result of green wavelengths being reflected in plants causing their green colour whereas like red light, blue wavelengths are absorbed.

In conclusion, the growth of wheat seedlings are effected by the different wavelengths they are exposed to, with red wavelengths bringing out the most favorable growth response in seedlings. Evaluation: Whilst conducting this experiment, a few errors occurred, which affected the results f the plants growth in response to the filtered light sources. The comparison and observation of the seedlings when placed in both light and dark areas was slightly inaccurate, as the plants were left out for over a week in the sun, but only around 5 days in the dark.

Unfortunately, this resulted in the plants becoming very dry and brittle and not very healthy. This could have been prevented, by ensuring that plants were moved indoors after the assigned time span in the light. Furthermore, the cotton on which the seedlings were placed on, did not have enough moisture and as such, plants were forced to survive for a couple of days without adequate water supply needed to thrive in these conditions. This caused seedlings to die and become very limp.

Additionally, the placement of the seeds upon the cotton covered Petri dish were extremely close together, preventing the observation of individual shoots in response to the filtered light. If this experiment was to be conducted again, a few changes could be employed to ensure that the seedlings are responding and growing towards a stimulus, as they would in a natural environment. Biology Photocopies in Wheat Seedlings By Kate_Elizabeth

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