Comparing the Growth of Pea Plants Grown in the Light and in the Dark
Aim: To compare the vertical growth and weight gain of pea plants
grown in the light and in the dark.
Background Knowledge: Photosynthesis forms the basis for this
experiment. This is the process by which a plant makes food for itself
from the raw materials around it. The energy needed for photosynthesis
comes from sunlight, which is the variable for this experiment. The
substance that absorbs sunlight is chlorophyll, which is mainly
contained in chloroplasts. This energy is used to convert carbon
dioxide (CO2) and water into sugars. This conversion creates the waste
product oxygen, which is used by humans for breathing. Without being
able to photosynthesise plants will stop growing and die. In a plant
growing in the dark the chlorophyll will slowly be destroyed causing
them to use their food reserves. Once the reserves have been used the
plant will die. This is what happens in plants that are not grown in
sunlight. Etiolation is a phenomenon that occurs in plants not being
grown in sunlight, whereby the stem of the plant rapidly elongates to
increase the probability of the plant finding light. In order to carry
out this etiolation the plant must use its food reserves, so if the
plant does not find light having used these reserves, it will die.
Planning: I am planning to do an experiment over 3 weeks to find out
the effect light has on the growth of pea plants. It will take place
in an environment with controlled light, with equal amounts of plants
being grown in the light and in the dark. All elements of the
experiment other than light will be kept the same, such as amount of
seeds in each pot, amount of soil in each pot and amount of water
given to each plant each day. This will ensure a fair experiment.
Prediction: I predict that in general, the plants grown in the light
will grow better than those grown in the dark. To begin with the
Two members of the group were instructed to visit the laboratory each day of the experiment to water and measure the plants (Handout 1). The measurements that were preformed were to be precise and accurate by the group by organizing a standardized way to measure the plants. The plants were measured from the level of the soil, which was flat throughout all the cups, to the tip of the apical meristems. The leaves were not considered. The watering of the plants took place nearly everyday, except for the times the lab was closed. Respective of cup label, the appropriate drop of solution was added to the plant, at the very tip of the apical meristems.
We used wheatgrass were 40 wheatgrass seeds, two empty pots, soil, and water. We first added soil for both pots and 20 wheatgrass seeds in each pot. My partner and I decided that we label pot one experiment which is “sugar and water” and pot two control which is “water” only. The experiment was for almost four weeks we had to make sure both get the same room temperature and water, so we can see the results after this amount of time. Both pots had same room temperature so both can have the same amount of sunlight also, the same amount of water which is a glass of water from the sink once a week. In the experiment pot we added a glass of water with one teaspoon of sugar and the control pot glass of water. Every week we used to see both pots grow almost the same. At the end of the experiment, my partner and I measured the length for both plants and we recorded the average for each plant, so we can know the rate of growth
stems of Ivy, one from the part of the garden that is exposed to lots
Increasing the light intensity will make photosynthesis faster. Variables: In this experiment there are a few things we have to keep the same.
Investigating the Effect of Light Intensity on the Size of a Plantain Leaf Title: To investigate the effect of light intensity on the size of a plantain leaf. Hypothesis: I predict that the size of the plantain leaves would increase as the light intensity decreases. Therefore, plantain leaves found in the shade will have larger surface areas than leaves found in an open area. Theory: Sunlight is an essential factor need to complete the process of photosynthesis.
The Effect of Light on the Organic Plant Elodea Aim: To calculate the rate of photosynthesis from the number of oxygen bubbles produced by the plant. Photosynthesis: The process by which green plants use the sun's energy to build up carbohydrate reserves. Plants make their own organic food such as starch. Plants need Carbon dioxide, water, light and chlorophyll in order to make food; and starch and oxygen are produced. Carbon dioxide and water are the raw materials of photosynthesis.
Experiment #1: The purpose of this experiment is to investigate the effects of baking soda and light intensity on the rate of photosynthesis of green spinach leave through the observation of floating disk.
Gregor Mendel was born into a German family, as a young man Mendel worked as a gardener and studied beekeeping. In his later life Mendel gained his fame as the founder of the modern science of genetics. The research that was his claim to fame was his pea plant experiment. Mendel looked at seven different characteristics of the pea plants. For example with seed colors when he bred a yellow pea and green pea together their offspring plant was always yellow. Though, in the next generation of plants, the green peas reemerged at a 1:3 ratio. To explain what he had discovered, Mendel put together the terms “recessive” and “dominant” in reference to specific traits. Such as, in the previous example the green peas were recessive and the yellow peas
An Analysis and Evaluation of Data from Photosynthesis Experiments Graph analysis This is my analysis for the investigation in to the affect of light intensity on the rate of photosynthesis to the Canadian pondweed, elodea. In the results the pattern is that when the light intensity is higher the readings are generally higher. On the graph the less the light intensity the lower the gradient of the curve. the equation for the photosynthesis process is; CO2 + 2H2O + Light Energy = =
To make the test fair I will use the same amount of water and the leaf
The light is absorbed by the chloroplasts to produce the chlorophyll. The chemical & word equation for photosynthesis is stated below: Sunlight Carbon dioxide + water -----------------> Glucose + oxygen Chlorophyll S 6CO2 + 6H20 -----------------> C6H12O6 + 6O2 C Light in photosynthesis Photosynthesis cannot take place without light, as light is one of the factors by which the green plant photosynthesises (makes its own food source) Light provides the plant with energy to make the chlorophyll which in turn absorbs the light. From this it can be said that the more light a plant is provided with (the more of a limiting factor is takes in) then the higher the rate at which the pond weed, or any plant, will give off a product of photosynthesis i.e. glucose or oxygen. From this the knowledge can be gained that depriving the aquatic plant I will be investigating of all light would be a pointless investigation, as no outcome could be measured.
= My hypothesis is to determine factors which might affect the stomatal opening in leaves. A practical experiment can easily be set up to determine these factors. The following procedure should be followed: Select a plant that has been kept in the light and label the container e.g. "LIGHT." Clip two leaves from this plant.
Photosynthesis is, “the process by which plants convert light energy from the Sun into chemical energy in the form of carbohydrates” thus producing, “food for all living organisms, directly or indirectly” (Zheng). Photosynthesis has been examined in thousands of different ways. Many of these experiments include studying the rate of photosynthesis and pigment accumulation by obtaining plants and then stressing their light and nutrient intake (Okunlola and Adekunle). Photosynthetic pigments reflect and absorb different wavelengths of visible light based off their polarity. In this experiment, we studied photosynthetic pigments, first, by determining polarity and then, by measuring the amount of light of a given wavelength that a pigment absorbs. We used two methods in this experiment, chromatography and spectrophotometry. Chromatography “is a method used to separate mixtures of substances into their components” (lab book) and spectrophotometry is the use of a spectrophotometer to measure transmittance of light through a liquid. We used our knowledge of polarity to predict that since the least polar pigments move the most, pigment 1 is chlorophyll b, pigment 2 is chlorophyll a, pigment 3 is an anthocyanin, pigment 4 is a xanthophyll, and since most polar pigments move the least, pigment 5 is
Photosynthesis is a process in which plants and other organisms convert the light energy from the sun or any other source into chemical energy that can be released to fuel an organism’s activities. During this reaction, carbon dioxide and water are converted into glucose and oxygen. This process takes place in leaf cells which contain chloroplasts and the reaction requires light energy from the sun, which is absorbed by a green substance called chlorophyll. The plants absorb the water through their roots from the earth and carbon dioxide through their leaves.
According to scientists, photosynthesis is “the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.” ("pho•to•syn•the•sis,")