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level: 6 - Photosynthesis

Questions and Answers List

level questions: 6 - Photosynthesis

QuestionAnswer
The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll pigments.Photosynthesis
What is photosynthesis, and what is its primary purpose?Photosynthesis is the process by which plants use sunlight to synthesize food, primarily to produce glucose.
A byproduct of photosynthesis, released when plants convert carbon dioxide and water into glucose.Oxygen
What is the byproduct of photosynthesis that this experiment measures?The byproduct measured in this experiment is oxygen.
Aquatic plants often used in experiments to study photosynthesis.Pondweed
Why is pondweed used in this experiment to study photosynthesis?Pondweed is used because it undergoes photosynthesis and releases oxygen, making it a suitable organism for studying this process.
The amount of light energy per unit of area, affecting the rate of photosynthesis.Light Intensity
How does light intensity affect the rate of photosynthesis?Light intensity directly influences the rate of photosynthesis, with higher light intensity generally leading to a higher rate of photosynthesis.
A light-emitting diode lamp used to control and vary the light intensity in the experiment.LED Lamp
What is the purpose of the LED lamp in this photosynthesis experiment?The LED lamp is used to control and vary the light intensity, allowing the investigation of its effect on the rate of photosynthesis.
The speed at which plants convert carbon dioxide and water into glucose and oxygen during photosynthesis.Rate of Photosynthesis
How is the rate of photosynthesis determined in this experiment?The rate of photosynthesis is determined by measuring the volume of oxygen released by the pondweed in a specific time frame, usually 2 minutes.
The varying distance between the LED lamp and the pondweed, controlling the independent variable (light intensity).Variable Distance
What is the independent variable in this experiment, and how is it controlled?The independent variable is light intensity, controlled by varying the distance between the LED lamp and the pondweed.
The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll pigments.Photosynthesis
What are the products of photosynthesis?The products of photosynthesis are glucose and oxygen.
Bubbles of oxygen released during the process of photosynthesis.Oxygen Bubbles
How can the rate of photosynthesis be estimated without measuring oxygen volume directly?The rate of photosynthesis can be estimated by counting the number of oxygen bubbles released.
Aquatic plants often used in experiments to study photosynthesis.Pondweed
Why is pondweed suitable for studying photosynthesis in experiments?Pondweed is used because it undergoes photosynthesis and releases oxygen, making it a suitable organism for studying this process.
The amount of light energy per unit of area, influencing the rate of photosynthesis.Light Intensity
How does light intensity affect the rate of photosynthesis?Light intensity is a factor that affects the rate of photosynthesis, with higher intensity generally leading to a higher rate.
The speed at which plants convert carbon dioxide and water into glucose and oxygen during photosynthesis.Rate of Photosynthesis
What is the dependent variable in an experiment investigating light intensity and photosynthesis?The dependent variable is the rate of photosynthesis, often measured by the volume of oxygen released or the number of oxygen bubbles.
Conducting an experiment to understand how varying light intensity influences the rate of photosynthesis.Investigating Light Intensity
How can the effect of light intensity on photosynthesis be investigated experimentally?To investigate the effect of light intensity, the rate of photosynthesis can be monitored while changing the distance or intensity of light sources.
Green pigment in plants that absorbs light energy for photosynthesis.Chlorophyll
Why is chlorophyll crucial for photosynthesis, and how does it relate to light intensity?Chlorophyll is essential for capturing light energy during photosynthesis. Light intensity influences the rate at which chlorophyll can absorb light and, consequently, the rate of photosynthesis.
A freshly cut 10 cm piece of pondweed, used as the organism for studying photosynthesis.Equipment: Pondweed
A device used to cover the pondweed during the experiment, allowing the collection of oxygen bubbles.Equipment: Filter Funnel
A transparent container used in conjunction with the filter funnel to collect and measure the volume of oxygen released by the pondweed.Equipment: Measuring Cylinder
A beaker of water placed around the pondweed to act as a shield, maintaining a constant temperature during the experiment.Equipment: Heat Shield (250 ml Beaker of Water)
A device used to monitor and ensure that the temperature of the water around the pondweed remains constant.Equipment: Thermometer
A light-emitting diode lamp used as a controlled light source for influencing the light intensity in the photosynthesis experiment.Equipment: LED Lamp
A measuring tool used to determine the distance from the light source (LED lamp) to the pondweed.Equipment: Metre Rule
A timekeeping device used to measure the duration for which oxygen bubbles are counted during the experiment.Equipment: Stopwatch
Place the pondweed into the beaker of water, ensuring the cut end is pointing upwards.Step 1 - Placing Pondweed
Cover the pondweed with the filter funnel.Step 2 - Covering with Funnel
Turn the measuring cylinder upside-down and carefully position it over the spout of the filter funnel.Step 3 - Inverting Measuring Cylinder
Position the lamp 1 meter away from the pondweed, switch it on, and start the stopwatch.Step 4 - Positioning Lamp
After 2 minutes, record the volume of oxygen collected at the top of the measuring cylinder.Step 5 - Recording Oxygen Volume
Repeat the experiment at least 2 more times to ensure reliability, then calculate the mean.Step 6 - Repeating Measurements
Repeat the above steps, moving the lamp 20 cm closer to the pondweed each time.Step 7 - Varying Light Intensity
Pondweed is an invasive species; therefore, do not remove it from the classroom after the experiment.Caution - Invasive Species
Why is it important to repeat the experiment multiple times?Multiple repetitions help ensure the reliability and accuracy of the results, reducing the impact of experimental variability.
What does the inversion of the measuring cylinder indicate about the measurement of oxygen volume?Inverting the measuring cylinder allows the measurement of the volume of oxygen collected, as it displaces water in the cylinder.
A timekeeping device used to measure the duration of the experiment, ensuring consistency between trials.Equipment: Stopwatch
Why is it necessary to vary the light intensity in the experiment?Varying light intensity allows the investigation of how different light levels affect the rate of photosynthesis, providing insights into the relationship between light and this biological process.
A tabular representation of data collected during an experiment, showing variables and corresponding values.Results Table
What is the purpose of a results table in an experiment?A results table is used to organize and present the data collected during an experiment, providing a clear overview of variables and their values.
A visual representation of data, often plotted on a coordinate system.Graph
Why is it common to represent experimental results using graphs?Graphs provide a visual way to analyze and interpret data, making it easier to identify patterns and trends.
The measurement of space between two points, often used as an independent variable in experiments.Distance
In the provided example, what is the independent variable?The independent variable is the distance between the lamp and the pondweed.
The amount of oxygen produced, often measured as a result of photosynthesis.Oxygen Volume
What is the dependent variable in this experiment?The dependent variable is the volume of oxygen produced, influenced by the distance between the lamp and the pondweed.
The process of marking data points on a graph to illustrate relationships between variables.Graph Plotting
How are the results typically represented on a graph?Results are represented by plotting points on the graph, where the x-axis corresponds to the independent variable (distance) and the y-axis corresponds to the dependent variable (oxygen volume).
The relationship between the amount of light reaching a plant and the rate of photosynthesis.Light Intensity and Photosynthesis
Explain the relationship between light intensity and photosynthesis based on the graph.The graph shows that as the distance (and, consequently, light intensity) decreases, the volume of oxygen increases, indicating a positive correlation between light intensity and the rate of photosynthesis.
The speed at which photosynthesis occurs, often influenced by factors like light intensity.Rate of Photosynthesis
Why does the rate of photosynthesis increase with higher light intensity?Photosynthesis requires light energy. Higher light intensity provides more energy for the process, leading to an increased rate of photosynthesis.