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Sunlight and Plant Growth

Sunlight and Plant Growth . By: Connor Chung. Big Question. Does amount of sunlight a plant receives have an affect on it’s growth?. Hypothesis.

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Sunlight and Plant Growth

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  1. Sunlight and Plant Growth By: Connor Chung

  2. Big Question Does amount of sunlight a plant receives have an affect on it’s growth?

  3. Hypothesis Plants use sunlight for photosynthesis to produce sugar, which is then converted into fuel. Plants use these fuel for it’s growth and it’s functions. If the amount of sunlight given to plants varies, then I hypothesize that the plant that received the most amount of sunlight will grow the fastest and the plant that received the least amount of sunlight will grow the slowest.

  4. Facts from Research Plants uses photosynthesis to produce fuel. Plants need fuel to grow. Photosynthesis requires sunlight. The part of the world that receives most sunlight have lush forests and vegetations. Amount of sunlight a plant receives is not the only determining factor for a plant’s growth.

  5. List of Materials 3 – 250 ml Beakers 3 – medium sized onions Measuring tape 200 ml of water Notebook for measurements Pencil

  6. Procedures Prepare a notebook for measurements. Label each beaker #1, #2, and #3. Fill each beaker with 200 ml of water. Place an onion into each beaker. Make sure that the root of each onion is submerged in water. The level of each onion submerged should be same for all three onions.

  7. Procedures (continued) Place beaker #1 in an area that will have direct sunlight throughout the experiment. Place beaker #2 in an area that will have no sunlight (inside of a closet with no windows). Place beaker #3 next to beaker #1 on days Monday through Wednesday. Place beaker #3 next to beaker #2 on days Thursday through Sunday. This procedure will limit how much sunlight the onion in beaker #3 will receive.

  8. Procedures (continued) On daily basis at 9:00 P.M., observe the water level to maintain a consistent level of 200 ml in the beakers. At the beginning of experiment, measure the onions to establish a base point. Every 3rd day, measure the length of the root and sprout. Continue the project for 3 weeks. At the end of experiment, measure the final growth and compare to your base point measurements to see if the hypothesis was correct or incorrect.

  9. Control vs. Variable In this experiment, the control will be the amount of water a plant receives. One of the interesting facts I’ve found during my research was that the sunlight is not the only determining factor for a plant’s growth. Amount of water received by the plant also has affect on it’s growth. In this experiment, I will keep a constant water level of 200 ml for all three beakers. Variable will be the amount of sunlight each plant receives.

  10. Observation and Comments 11/01/09 Placed Beaker #1 next to a window that receives sunlight throughout the day. Placed Beaker #2 in a closet that receives no sunlight throughout the day. Beaker #3 will be moved every 3 days to receive or not to receive sunlight to vary the amount of sunlight it receives - it will start out next to Beaker #1. Constant water level of 200 ml will be maintained Trimmed roots on all 3 onions to same length. No sprouts on all 3 onions.

  11. Observation and Comments 11/04/09 Measured root of each onion. The measurements were taken from bottom of the onion to tip of each root. The measurements were take from the longest root of each onion. Moved Beaker #3 next to #2 after taking measurements - Beaker #3 will receive no sunlight for next 3 days.

  12. Observation and Comments 11/08/09 Moved Beaker #3 next to Beaker #1 after measurements. Beaker #3 will receive sunlight for next 3 days. No sprouts observed on all 3 onions.

  13. Observation and Comments 11/11/09 Moved Beaker #3 next to Beaker #2 after measurements. Beaker #3 will receive no sunlight for next 3 days. No sprouts observed on all 3 onions

  14. Observation and Comments 11/15/09 Moved Beaker #3 next to Beaker #1 after measurements. Beaker #3 will receive sunlight for next 3 days. No sprouts observed on all 3 onions.

  15. Observation and Comments 11/18/09 Moved Beaker #3 next to Beaker #2 after the measurements. Beaker #3 will receive no sunlight for next 3 days. No sprouts observed on all 3 onions.

  16. Observation and Comments 11/22/09 Moved Beaker #3 next to Beaker #1 after the measurements. Beaker #3 will receive sunlight for next 3 days. Sprout observed on onion in Beaker #1.

  17. Observation and Comments 11/25/09 Moved Beaker #3 next to Beaker #2 after the measurements. Beaker #3 will receive no sunlight for next 3 days. Sprout observed only in Beaker #1.

  18. Observation and Comments 11/29/09 Final measurements taken on all 3 onions. Sprout observed in Beaker #3.

  19. Analysis of Data In my experiment, Beaker #2 received no sunlight and grew only 3.7 cm of its root and did not sprout at the top. Beaker #3 received limited amount of sunlight and its root grew 4.5 cm and did sprout with height of 0.3cm at top.

  20. Analysis of Data (continued) Beaker #1 received continuous sunlight and its root grew 7.1 cm and had a spout height of 0.7 cm.

  21. Conclusion This experiment tested my hypothesis that the plant that received the most amount of sunlight grew the fastest and the plant that received the least amount of sunlight grew the slowest. The experiment showed that there was a direct relationship between how much sunlight an onion received with its growth. More sunlight an onion received, better it grew.

  22. Reference Measuring Plant Growth http://www.sciencebuddies.org/mentoring/project_ideas/PlantBio_measuring_growth.shtml Photosynthesis http://en.wikipedia.org/wiki/Photosynthesis Photosynthesis http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPS.html Requirements for Plant Growth http://www.aces.uiuc.edu/vista/html_pubs/hydro/require.html Answers.com http://wiki.answers.com/Q/How_does_sunlight_effect_plant_growth

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