The Influence of Abiotic Factors on Dandelions
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The students hypothesized that less weeds would be found in shady areas with less sunlight. They measured dandelion growth in hula hoop plots in sunny and shady areas of grass. Their data showed significantly more dandelions grew in sunny areas, supporting their hypothesis that dandelion growth requires photosynthesis which needs sunlight. They concluded the experiment provided evidence that abiotic sunlight levels affect the number of dandelions present.
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GES 102 Lab #5 Spring 2015 20 .docx
GES 102 Lab #5 Spring 2015
20
GES 102 - PHOTOSYNTHESIS LAB
This week you will investigate the effect of light intensity on the rate of photosynthesis in
spinach leaves. Fresh spinach bought in the store is green, and the leaves still have the
ability to do photosynthesis. Photosynthesis produces carbohydrates and oxygen and we
will use the rate of oxygen production as an indicator of how quickly the spinach leaves
actually do photosynthesis.
You will use a hole punch to make a number of small disks of spinach. These disks float
when they contain oxygen from photosynthesis. By applying vacuum to the small spinach
disks, the oxygen is forced out, and they sink. When you then place the disks in a
transparent cup with water, and expose them to light, they will produce oxygen and
eventually float. The time it takes the small disks to float is a measure of photosynthesis,
and you will test the effect of different light intensities on the floatation time.
Background:
In your first lab this semester you investigated how the UV portion of sunlight was able
to cause harm to living cells, which is not so surprising since this shorter wavelength
carry enough energy to damage the cell’s DNA. In this week’s lab we will instead use the
portion of radiation from the sun that we call daylight (380-780 nm), plenty of which
makes it down to the earth’s surface. Our eyes are sensitive to this portion of the
spectrum, and it’s also the portion plants use for photosynthesis.
The process of photosynthesis can be simplified as:
CO2 + H2O sugar + O2.
It is really divided up into two sets of reactions, the Light Reaction and the Calvin
Cycle. In the Light Reaction the plant cells use chlorophyll to capture some of the energy
in sunlight. When sunlight hits a chlorophyll molecule, electrons in the chlorophyll
GES 102 Lab #5 Spring 2015
21
molecule are excited, they ‘spin’ faster because of the absorbed energy. These excited
electrons are passed on down the line and chlorophyll will take a continuous supply of
new electrons from H2O which is broken down, producing O2. The energy in the excited
electrons is eventually used to produce two high energy molecules, called ATP and
NADPH. In the next step, the Calvin Cycle, the energy contained in ATP and NADPH is
used to help take CO2 (carbon dioxide) from the air and manufacture sugar.
Spinach plants normally get their CO2 from the air, through small openings on the
underside of their leaves, called stomata. In our experiment some sodium bicarbonate
(NaHCO3) will be added to the water, and provide the carbon needed for the small
spinach disks to do photosynthesis. The O2 produced will be trapped inside the spinach
disks and increase their buoyancy until they float.
Alongside photosynthesis, the plants also do cellular respiration. They certainly are
autotrophs and can produce their own “food”, the sugar. ...
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The student conducted an experiment to determine if pH levels affect light absorption in plant leaves. Spider plants were watered with water at pH levels of 3, 7, and 10 for three weeks. The leaves were then analyzed using a UV spectrophotometer to measure absorption. Preliminary results showed slightly lower absorption in higher pH plants, but the data was inconclusive due to experimental errors. Further research is needed to fully understand the relationship between pH and light absorption in plant leaves.
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1. A hypothesis is an educated guess about a possible relationship between two or more variables that can be tested. It needs to be specific enough to be tested through experimentation or further research.
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- Observations involve the five senses to gather information. An observation notes that a plant is planted inside a bottle.
- Inferences are educated guesses about observations, such as inferring the plant will die or grow healthy.
- Hypotheses are "if-then" statements that can be tested, such as hypotheses that if the plant is in the bottle, it will die or grow healthy.
- Experiments are designed to test hypotheses, with variables - the manipulated variable tested, responding variable measured, and controlled variables kept the same.
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Here are two appropriate visual displays for the data:
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Soil and population
The students investigated how the distance from a swamp affects the population density of twinleaf plants. They hypothesized that areas closer to the swamp would have higher twinleaf densities because the soil is moister. The students counted the number of twinleaves within hula hoops placed at increasing distances from the swamp. Their results showed twinleaf counts decreased with greater distances from the swamp, supporting their hypothesis that water and soil moisture from the swamp allows for higher twinleaf growth and reproduction closer to the swamp.
Soil and population
The students investigated how the distance from a swamp affects the population density of twinleaf plants. They hypothesized that twinleaf population density would be higher closer to the swamp since the soil is moister. The students counted the number of twinleaves within hula hoops placed at increasing distances from the swamp. Their results showed fewer twinleaves with greater distance from the swamp, supporting their hypothesis that proximity to the swamp's water allows for higher twinleaf growth and reproduction.
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- Physicists estimate there are at least 1010107 universes in the multiverse, but a human can only distinguish 1016 configurations, so we are limited in what we can observe.
- The observable universe is estimated to be 1016 times larger than what a typical human can absorb, so we have only explored an infinitesimally small fraction.
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GES 102 Lab #5 Spring 2015 20 .docx
GES 102 Lab #5 Spring 2015
20
GES 102 - PHOTOSYNTHESIS LAB
This week you will investigate the effect of light intensity on the rate of photosynthesis in
spinach leaves. Fresh spinach bought in the store is green, and the leaves still have the
ability to do photosynthesis. Photosynthesis produces carbohydrates and oxygen and we
will use the rate of oxygen production as an indicator of how quickly the spinach leaves
actually do photosynthesis.
You will use a hole punch to make a number of small disks of spinach. These disks float
when they contain oxygen from photosynthesis. By applying vacuum to the small spinach
disks, the oxygen is forced out, and they sink. When you then place the disks in a
transparent cup with water, and expose them to light, they will produce oxygen and
eventually float. The time it takes the small disks to float is a measure of photosynthesis,
and you will test the effect of different light intensities on the floatation time.
Background:
In your first lab this semester you investigated how the UV portion of sunlight was able
to cause harm to living cells, which is not so surprising since this shorter wavelength
carry enough energy to damage the cell’s DNA. In this week’s lab we will instead use the
portion of radiation from the sun that we call daylight (380-780 nm), plenty of which
makes it down to the earth’s surface. Our eyes are sensitive to this portion of the
spectrum, and it’s also the portion plants use for photosynthesis.
The process of photosynthesis can be simplified as:
CO2 + H2O sugar + O2.
It is really divided up into two sets of reactions, the Light Reaction and the Calvin
Cycle. In the Light Reaction the plant cells use chlorophyll to capture some of the energy
in sunlight. When sunlight hits a chlorophyll molecule, electrons in the chlorophyll
GES 102 Lab #5 Spring 2015
21
molecule are excited, they ‘spin’ faster because of the absorbed energy. These excited
electrons are passed on down the line and chlorophyll will take a continuous supply of
new electrons from H2O which is broken down, producing O2. The energy in the excited
electrons is eventually used to produce two high energy molecules, called ATP and
NADPH. In the next step, the Calvin Cycle, the energy contained in ATP and NADPH is
used to help take CO2 (carbon dioxide) from the air and manufacture sugar.
Spinach plants normally get their CO2 from the air, through small openings on the
underside of their leaves, called stomata. In our experiment some sodium bicarbonate
(NaHCO3) will be added to the water, and provide the carbon needed for the small
spinach disks to do photosynthesis. The O2 produced will be trapped inside the spinach
disks and increase their buoyancy until they float.
Alongside photosynthesis, the plants also do cellular respiration. They certainly are
autotrophs and can produce their own “food”, the sugar. ...
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The Influence of Abiotic Factors on Dandelions
- 1. The Influence of Abiotic Factors Alessia Risi, Shishu Alamgir, and Maren Achterberg
- 4. Graph
- 5. Data Table With sun Without sun 3 dandelions 0 dandelions 1 dandelion 0 dandelions 5 dandelions 1 dandelion 2 dandelions 1 dandelion 1 dandelion 0 dandelions 4 dandelions 0 dandelions 1 dandelion 0 dandelions 3 dandelions 1 dandelion 2 dandelions 0 dandelions 2 dandelions 1 dandelion