Respiration and Photosynthesis Lab | mylabdiary
They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. Bubbles can be produced by many things, even plants. copyright Engineering Connection. With the onset of photosynthesis during light periods, bubbles could readily . The relationship between bubble formation processes and gas. What effect does light intensity have on mean bubble formation rate The relationship between light intesnsity and the distance the plant is.
Raise your other hand high in the air. Now take a deep breath and hold it for as long as you can. When you cannot hold your breath any longer, lower your raised hand and unpinch your nose. Why did you need to start breathing again? From their elementary school studies, expect students to be able to tell you that their bodies need air in order to survive. What, exactly, is in air? Students may not know that air contains more than oxygen.
So, specifically what component s of air do our bodies need? Expect them to be able to answer that it is oxygen. And what do our bodies do with oxygen? That's right, oygen from the air is picked up in the lungs by the blood and carried to all parts of the body, where it is used by muscles and the brain and all the other organs and tissues of the body.
We cannot live without it. From where did the oxygen in the atmosphere come? They may know or be able to reason that it is the result of all the plants that have lived on the Earth and have been doing photosynthesis for many millions of years. Today, you will work in teams to conduct an experiment to see if the amount of light plants receive can affect this production of oxygen. The sum of all the values in a set of data, divided by the number of values in the data set; also known as the average.
Tthe middle value in a set of data, obtained by organizing the data values in an ordered list from smallest to largest, and then finding the value that is at the half-way point in the list. If the data set consists of an even number of values, the median is determined by averaging the two middle values.
Acoustic effects during photosynthesis of aquatic plants enable new research opportunities
The value in a set of data that occurs most frequently. It is possible to have two or more modes in a set of data, if two or more values occur with equal frequency. Procedure Overall Experiment Plan In a class discussion format, students establish a hypothesis to be tested by the class in the experiment.
Working in teams, students set up and conduct the experiment. Each team conducts two trials: The data collected are the number of bubbles of oxygen that are given off by the plants in a five-minute period, first at low-light levels, and then at high-light levels. Then the groups come together to pool their data from each of the two trials.Photosynthesis - Photosynthesis in plants - Photosynthesis - Biology basics for children - elearnin
From these data, students individually determine the mean, median and modes for the numbers of bubbles produced during the two different light conditions. Then students individually graph the data, using bar graphs that show the mean numbers of bubbles and the ranges for each test condition. Generating a Hypothesis Explain to the class that before researchers start experiments, they first create a prediction about the expected outcome of the experiment.
This prediction is known as a hypothesis. A hypothesis is not simply a guess, however. The enormous number of oxygen bubbles creates a uniform sound image that resembles meat being cooked in a frying pan. In most macrophytes, the oxygen bubbles typically emerge in series from the stomata. The discharge frequency of pulses is very often regular, opening the possibility to determine pulse-frequencies and changes of pulse-frequencies by counting the bubbles manually or with photocells.
The Canadian waterweed Elodea canadensis has been the most popular test object: Nonetheless, these counting methods are cumbersome, uncertain and inaccurate.
Exact curves at changes in photosynthesis intensity cannot be determined because it is not possible to determine the time intervals from pulse to pulse: Our many years of work with aquatic organisms as well as through the use of video recordings showed that the typical sound pulses during photosynthesis are not caused by the passage of the bubbles through the water surface, but upon emergence from the stomata.
The same effects occur when air bubbles emerge from damaged plant tissue. This provides the opportunity to establish the exact time of bubble emission. This phenomenon proved to be the basis for exact acoustic measurements, opening entirely new possibilities for plant physiology. Results The type of bubble formation can be divided into three categories: This typically involves larger-than-average bubbles.
This emission type may occur over a short period a few secondsbut usually lasts much longer up to about half an hour. Photosystems Photosystems are complex structures of involving pigments located within the thylakoid membrane that energize electrons using light energy.
Effect of Light Intensity - Brilliant Biology Student
Each pigment is attuned to a specific portion of the spectrum of light. The central pigment is chlorophyll? Within the center of chlorophyll? As chlorophyll energizes an electron and sends the electron outside the photosystem to waiting receptor molecules, the electron is replaced from the water molecules. Oxygen Formation As electrons are stripped from water molecules, the water is broken into component atoms. The oxygen atoms from two water molecules combine to form diatomic oxygen O2.
The hydrogen atoms, which are single protons missing their electrons, aid the creation of the proton gradient within the space enclosed by the thylakoid membrane. The diatomic oxygen is released and the chlorophyll center binds to new water molecules to repeat the process.