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effect of light intensity on the germination and growth of crest plants

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Introduction

Aim: To investigate the effect of light intensity on the germination and growth of cress plants. Hypothesis: Plants feed by photosynthesis. They use carbon dioxide from the air and water to make carbohydrates. This process requires an energy input - this energy comes from a light source. Plants need an adequate amount of light for the process of photosynthesis to occur correctly. When a plant photosynthesises it is providing itself with food to grow, without the component of light, a plant will not grow correctly because light is a limiting factor; I therefore predict that the cress seeds growing in complete darkness will become etiolated (they will be taller and thinner than the others; seeking any available light). The seeds in full sunlight will grow to be shorter but stronger. Plan: 1. I will firstly collect my apparatus: 5 dishes with an equal diameter of 10cm (the dishes will be used as a base), 25 cotton wool pads (each dish will be layered with the cotton wool pads as a basis for the seeds to grow on), cress seeds, 5 equal sized shoe boxes (a dish will be placed into each box), 12 sheets of standard A4 paper (the paper will be used as light filters to decrease intensities), a syringe (to measure equal amounts of water for each plant), pins (to pin paper onto certain shoeboxes) ...read more.

Middle

7. Now that I have carried out my experiment and have a set of results I will go on to draw my diagram, process my results onto a bar chart and finally write a detailed conclusion and evaluation. I also will state any modifications to my plan. Modifications to plan: As my experiment was in procedure I decided to make two modifications to my plan which were necessary but also beneficial to my overall results: * Instead of watering each plant with 15cm3 a day I had to change the amount of water each plant received. I discovered that the water from the plant in complete darkness didn't evaporate as quick of that in the plant in complete sunlight. I therefore watered the plant in complete darkness with 5cm3 of water (after the second day), this was a necessary modification as the plant would have been overwatered most likely killing it. I also watered the plant with 6 pieces of A4 paper covering it with the same amount of water for the same reasons. I reduced the amount of water the plant with 4 pieces of A4 covering it to 10cm3 a day, as it would have also become over watered. The plant with two pieces of paper covering it and the plant in full sunlight received the original amount of 15cm3 of water a day as they weren't concealed enough to prevent water evaporating. ...read more.

Conclusion

length Evaluation: Overall I think I carried out the experiment fairly well as everything went to plan and there were no anomalous results. However in an ideal world there could have been a few things that I could have done to improve my experiment. I firstly could have a had a larger difference in intensities of light, for example I could of had ten different boxes where the first and last would be in complete darkness/light (equivalent to before) however the boxes in between could of had from 1 sheet to 8 sheets of paper covering the plants, providing me with a larger range of results to use. I could have also measured the lengths of 20 stems from each box once again giving me a wider range of results to focus on and analyse. A minimal factor that could have had a slight effect on my results would be controlling the amount of time it took to water the plants every day, as the plants that were meant to be in complete darkness and unidirectional light were exposed to full light at the time of watering them. If there was a way that I could water the plants without exposing them to full light, I think I would gain a much more precise set of results. However overall I think that I carried out my investigation to a high standard with few errors. ?? ?? ?? ?? English International College: ES130 Name: Archie Mustafa Skills: C4 ...read more.

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