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The effect of caffiene on plant growth

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Taylor O'Leary

on 22 February 2014

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Transcript of The effect of caffiene on plant growth

The Effect of Caffeine on Plant Growth
Does caffeine effect the growth of plants?

The plants watered with more caffeine will grow faster than the ones watered with less caffeine. The plants watered with no caffeine will grow the slowest of the three. This will happen because caffeine is stimulant in humans. Therefore, it will work the same way on plants and speed up there growth.
Fill the 3 pots with soil.
Dig 10, 4cm deep holes in each pot.
Place 1 bean in each hole and cover up with soil.
Water each pot with only water until germinated.
Once some germinated stared watering with water, water mixed with 1 caffeine pill per 250ml and water mixed with 2 caffeine pills per 250ml. Water every 2 days.
Once germinated also start measuring every 2 days, pick the first 4 in each pot to sprout and add up their height(cm) then divide by 4 to find the average.
Every 2 days along with the measuring take a picture of the pots.

I wanted to learn about plants growth and what effects the growth. Also I wanted to do a project that I could watch and visualize. With less land available for farmers, they need a way to grow plants faster.
3 medium size pots.
2kg potting soil per pot.
30 green pod beans.
100mg caffeine pills.

Why plants need water

Plants need water more than any other living thing. Plants are about 90% water. When plants are not watered properly they will wilt. This is because of something called turgor, which is water pressure inside the cells that make up the plant skeleton. Water enters a plant through the root system and travels up to its leaves. When a plant is properly hydrated there is enough water pressure in the cells to make the plant strong and sturdy; when a plant doesn’t get enough water the pressure inside the stem and leaves drop and they wilt. The plants in the project did not wilt, the amount of caffeine given did not affect the water pressure keeping the plants still strong and sturdy. Based on research it is believe that with higher levels of caffeine over a longer period of time this may of occurred..
Caffeine is a drug that is naturally produced in the leaves and seeds of more than 60 plants. It is also produced artificially and added to certain foods. Caffeine is one of the oldest forms of stimuli known to the world, it's an organic substance found primarily in coffee beans. Most people don’t know that caffeine is actually a chemical formula not a physical substance. Nowadays caffeine is used in coffee and used to keep us awake and lively.

Independent variables:
- the level of caffeine
-growth of plants
-amount of liquid
- amount and type of soil
- amount and type of beans
- amount of sunlight

Water for photosynthesis
Plants also need water for photosynthesis. In green plants, sunlight captured by chlorophyll enables carbon dioxide from the air to unite with water and minerals from the soil to create food. The plants in the project had no problems making food and were very healthy. The caffeine did not throw off the photosynthesis cycle in the plants. Sunlight captured by chlorophyll also releases oxygen into the air. Most photosynthesis takes place in small chloroplast. Chloroplast is in the cells of plant leaves. Chloroplast holds chlorophyll which absorbs sunlight. Energy from the sun then splits water monticules into 1 part oxygen and 2 parts hydrogen. The amount of sunlight was abundant during the experiment.
The caffeine made very little to no effect on the plants. My Hypothesis was incorrect it was no help to their growth. This may be because there was not enough caffeine to leave much of an effect on the plants. Later, the plants will be tested with many more caffeine pills to see if it makes any effects. I thought that caffeine would help the plants grow faster, but now after doing the experiment I've realized that caffeine does nothing to the plants growth but too much would eventually kill the plants. Over all the plants grew fine and did nothing abnormal at all. My new hypothesis would be that the plants will not grow much at all unless extreme levels of caffeine.
Caffeine will increase the pH level in the soil, making it more acidic, which can be deadly to some plants. This was not the results in the experiment. It was not deadly to any of the plants. The results could have been different depending on the amount of caffeine used. Caffeine affects plant cells in specific ways. Although the growth rate of cells is stable when first applied, there comes a point when the cells begin to stop developing. Caffeine interferes with the natural physiological processes that the plant experiences. For example the production of food during photosynthesis and the plants ability to absorb minerals and water from the soil are dangerously interfered with. As the plants cells begin to die off including the roots and leaves, the plant becomes less able to maintain normal functions. Growth becomes stunted, and eventually the plant dies. Its believed that the plant in the project would have died eventually with more caffeine and a longer time period.
Adding caffeine to the plant cycle
This would be helpful in the future if I study anything on plants and there growth. It will also be useful next year because I will have a better idea about what to do for the science fair. If I were to do this again I would use more caffeine for each plant that I watered with caffeine so there would be more of an effect on plants. I was conservative about the amount of caffeine I used because I was worried that nothing would grow.
Garden Guides/www.gardenguides.com
Science Line/www.scienceline.ucsb.edu
World book/plants/2001 15,p.
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