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Design for cress seed investigation

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Introduction: Plant growth is affected by various factors. This can be seen best in young plants, as the growth rate is highest. One of these factors is the amount of light these plants are exposed to, the degree of this will be researched during this experiment. Research question: How does the amount of light cress-seeds and young cress-plants are exposed to affect the growth speed? Variables: * Independent o The amount of light the (germinated) cress seeds are exposed to. * Dependent o The length of the cress seeds * Controlled o Nutrients in soil * The same soil will be used for all different trials, practically the nutrients will decrease faster in the faster growing cress-seeds, however the amount ...read more.


o Light intensity and wavelength * The same lamp will be used above all experiments, the distance should be fairly high such that the light can be regarded as a linear light source rather than a radial one. o Temperature * All cress-seeds will be in the same room and the lamp should be placed on a sufficient distance such that the temperature of the lamp should not noticably influence the temperature o Humidity of air * All cress-seeds will be in the same room o Carbon dioxide and oxygen concentration * All cress seeds will be in the same room o Type and amount of seeds * All seeds will be of the species Lepidium sativum (garden cress) ...read more.


* 5x 45*45cm cardboard * Knife * Ruler * Water spray Method: 1. Take the 5 cardboards and bend 2.5 cm of the sides downwards: a. 2. Cut the smallest possible holes into each cardboard with the density's described below: a. (holes not to scale) 3. Fill the petri dishes with the soil 4. Place 5 cress seeds into each petri dish. (Although you should be aware that not all cress-seeds will germinate) 5. Place 4 petri dishes under each cardboard cover 6. Place a single lamp above all the cardboard boxes on a height of approximately 1-2 meter. 7. Measure the height of the cress-seeds every two days for 2 weeks and spray water in such a manner that the humidity of the soil is approximately equal, as the soil under the maximum light might dry up faster. ...read more.

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