Investigating The Effect Of Light Intensity, Co2 And Diuron On The Rate Of Photosynthesis

Investigating The Effect Of Light Intensity, Co2 And Diuron On The Rate Of Photosynthesis

Length: 1049 words (3 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

A study using an O2 electrode to measure the amount of O2 produced or consumed over an amount of time with varying light intensities to determine the effect of light intensity, CO2 and Diuron on the rate of photosynthesis of Spinacia oleracea.
Introduction
Photosynthesis is the process in which chloroplasts found in plants, algae and some bacteria are used to convert light energy to chemical food energy. (Reece, et al. 2012, p. 190) (Molecules, Genes & Cells Laboratory Manual 2016).
Photosynthesis can be broken down into two parts, light dependent reactions and light independent reactions or Calvin Cycle. Light dependent reactions use light energy collected by the thylakoid to convert NADP+ and ADP to NADPH and ATP respectively (Cloot 1994, p. 23). This process is shown in figure 1. In the Calvin cycle which is light independent, CO2 is converted to glucose by using the energy of ATP and NADPH (Reece, et al. 2012, p. 192). The rate of photosynthesis can be determined using the amount of oxygen produced in an amount of time. An oxygen electrode is able to do this (Molecules, Genes & Cells Laboratory Manual 2016).
Respiration is the process in which glucose is broken down by the mitochondria to obtain the energy in its bonds so that is may be used in other metabolic processes. Respiration occurs in all living organisms and is separate from photosynthesis (Molecules, Genes & Cells Laboratory Manual 2016). Oxygen is consumed in this process and carbon dioxide is one of the products (Reece, et al. 2012, p. 169-184).
Diuron is a herbicide that will be used in this experiment. Diuron inhibits photosynthesis as found in a study by Harrington, et al. (2005).
The hypothesis being tested is that as the light intensity is increased the rat...


... middle of paper ...


...ired for the highest rate of photosynthesis. This would mean that plants will be in the best conditions when they are exposed to high levels of light and high levels of CO2. The presence of herbicides such as Diuron will prevent photosynthesis so they should not be present. It would be preferable for plants to grow tall or to have their leaves up high so that their chloroplasts may be exposed to the most light. Plants should not be bunched together as they will have to compete for resources. Being covered by shelter or other plants will prevent light from hitting the chloroplasts. Plants would photosynthesise the best in summer as they are exposed to the highest amount of light energy and would be lowest in Winter when there is cloud cover. Being placed higher on a mountain may be more beneficial however it is unknown how a plant may react to different temperatures.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

How Light Intensity Affects The Reaction Rate Of Photosynthesis Essay

- In the light intensity experiment, tubes of buffer solution, chloroplast, water and DPIP were placed in different intensities of light to determine how light intensity affects the reaction rate of photosynthesis. The reaction rate was measured by absorbance values in five-minute increments for 30 minutes. The tubes were placed at 24 cm away, 30 cm away, 49 cm away, and completely dark. The tube that was closest to the light had the smallest absorbance value, while the dark tube had the highest value....   [tags: Photosynthesis, Light, Chlorophyll]

Better Essays
1234 words (3.5 pages)

Essay on The Effect of Light Intensity on the Rate of Photosynthesis

- The Effect of Light Intensity on the Rate of Photosynthesis Introduction Green plants don't exude food from the soil they make their own, using sunlight. This is called photosynthesis, which means "making through light". This occurs in the cells of a green plant, which are exposed to sunlight. Four things are needed to make this process work and this gives two thing: the four things needed are light from the sun, carbon dioxide diffuses from the air, water from the soil and chlorophyll in the leaves....   [tags: Papers]

Free Essays
1311 words (3.7 pages)

The Effect of Light Intensity on the Rate of Photosynthesis Essay

- The Effect of Light Intensity on the Rate of Photosynthesis Plan: Aim: To investigate the affect of light intensity on the rate of photosynthesis. Theory: Before I predict what will happen I must look at how photosynthesis occurs. Photosynthesis is the way plants create a source of food for themselves. Photosynthesis requires the following resources; Carbon Dioxide, Water and light. Inside the leaves of a plant there is a green substance, this substance is known as chlorophyll....   [tags: Papers]

Better Essays
531 words (1.5 pages)

The Effect of Light Intensity on the Rate of Photosynthesis Essay example

- The Effect of Light Intensity on the Rate of Photosynthesis Experiment: An experiment to investigate the effect of light intensity on the rate of photosynthsis. Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis. Introduction: Photosynthesis is the process that produces 'food' for plants, this 'food' is called glucose. The process takes place in the leaves of green plants, this is what the leaves are for. There are four things that are required by the plant before it can carry out photosynthesis, they are light, chlorophyll, carbon dioxide and water ....   [tags: Papers]

Free Essays
441 words (1.3 pages)

biology - how light intensity affects the rate of photosynthesis Essay

- Biology Coursework ¡V Does The Light Intensity Affect the Rate of Photosynthesis The Investigation In this experiment I will investigate the affect in which the light intensity will have on a plants photosynthesis process. This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable. Variables The input variable which will be used in this investigation will be the light intensity (this will be a 100Watt bulb being moved closer and further away from the plant)....   [tags: essays research papers]

Better Essays
2109 words (6 pages)

The Effect of Light Intensity and Temperature on the Rate of Photosynthesis

- The Effect of Light Intensity and Temperature on the Rate of Photosynthesis Aim The aim of my experiment is to determine whether intensity of light and temperature would affect the rate of photosynthesis in a plant. To do this, I will place a piece of pondweed in varying light intensities and temperatures, and observe the amount of oxygen being given off. I am using pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in water. Introduction Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells....   [tags: Papers]

Better Essays
2128 words (6.1 pages)

Essay on The Relationship Between Light Intensity and the Rate of Photosynthesis

- The Relationship Between Light Intensity and the Rate of Photosynthesis Investigate the relationship between light intensity and the rate of photosynthesis. Photosynthesis is important because animals eat food, as it is a source of energy. All living things need a constant supply of energy if they are to grow, reproduce or move. Plants do not eat food but they do have some in the form of starch in their leaves. The symbol equation for photosynthesis is: 6 CO2+6 H2O-light C6 H12 06+6 02....   [tags: Papers]

Free Essays
826 words (2.4 pages)

The Effect of Light Intensity on the Rate of Photosynthesis in an Aquatic Plant

- The Effect of Light Intensity on the Rate of Photosynthesis in an Aquatic Plant Introduction The input variable I will be investigating is light, as light is just one of the 4 factors required in the green-plant process of photosynthesis. Photosynthesis is the process by which green-plants use sunlight, carbon dioxide, water & chlorophyll to produce their own food source. This process is also affected by the temperature surrounding the plant (the species of plant we experimented with, pond weed, photosynthesised best at around 20 degrees centigrade.) Light, temperature & CO2 are known as limiting factors, and each is as important as the next in photosynthes...   [tags: Papers]

Free Essays
4194 words (12 pages)

Does raising the light intensity increase the rate of photosynthesis? Essay

- Does raising the light intensity increase the rate of photosynthesis. Aim: To see if raising the light intensity increases the rate of photosynthesis. Prediction:I predict that raising the light intensity will increase the rate of photosynthesis. I think this because light is the most important thing needed for photosynthesis. I then think that the rate of photosynthesis will stay the same when it reaches a certain point. I think this because the plant may use up all of the carbon dioxide (Sodium hydro carbonate) and the plant can have as much light as it needs but if it does not have any carbon dioxide it will not be able to photosynthesise....   [tags: Biology]

Free Essays
940 words (2.7 pages)

An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis

- An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis Introduction Photosynthetic takes place in the chloroplasts of green plant cells; it can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: [IMAGE]6CO2 + 6H20 C6 H12 O6 + 6O2 it has been proven many times that plants need light to be able to photosynthesize , so you can say that without light the plant would neither photosynthesize or survive....   [tags: Papers]

Free Essays
970 words (2.8 pages)