Photosynthesis Experiment Overview
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Questions and Answers

What processes lead to the formation of fossil fuels?

  • Fermentation of plant materials in open air
  • High pressure and temperature acting on dead organisms in low-oxygen areas (correct)
  • Immediate breakdown of organic matter by scavengers
  • Rapid decomposition of organisms in oxygen-rich environments

    • Which fossil fuel is primarily formed from the remains of tiny marine organisms?

  • Peat
  • Coal
  • Charcoal
  • Natural gas (correct)

    • What is the primary use of coal extracted from the ground?

  • Producing natural gas
  • Carbon capture storage
  • Generates electricity in power stations (correct)
  • Converting to petroleum for transport

    • What happens when fossil fuels are burned?

    <p>They produce carbon dioxide and energy</p> Signup and view all the answers

    How long does the process of turning dead organisms into fossil fuels typically take?

    <p>Hundreds of millions of years</p> Signup and view all the answers

    What is the primary substance that plants store carbohydrates as?

    <p>Starch</p> Signup and view all the answers

    In which part of the plant cell is starch stored?

    <p>Chloroplasts</p> Signup and view all the answers

    What is the purpose of the iodine test in the context of photosynthesis?

    <p>To check for the presence of starch</p> Signup and view all the answers

    What is the first step in preparing a leaf for the iodine test?

    <p>Place the leaf in boiling water</p> Signup and view all the answers

    Why is it important to turn off the burner before using ethanol in the experiment?

    <p>Ethanol is flammable</p> Signup and view all the answers

    What color should you expect to see dissolved in ethanol when chlorophyll is extracted from a leaf?

    <p>Green</p> Signup and view all the answers

    What safety measure is recommended while performing the leaf testing experiment?

    <p>Stand up while working</p> Signup and view all the answers

    What should be monitored while heating ethanol in the experiment?

    <p>The appearance of bubbles</p> Signup and view all the answers

    What is the first step you should take in the experiment when bubbles are observed?

    <p>Measure the distance between the lamp and the test tube</p> Signup and view all the answers

    What should you do after counting the number of bubbles for the first time?

    <p>Repeat the counting two more times</p> Signup and view all the answers

    How should you display the results of your experiment?

    <p>In a graph with appropriate labels and scales</p> Signup and view all the answers

    Which of the following best explains what light intensity refers to in this experiment?

    <p>The amount of light received by the plant</p> Signup and view all the answers

    What is the expected trend when the distance of the lamp from the test tube increases?

    <p>The number of bubbles produced will decrease</p> Signup and view all the answers

    What is the primary purpose of exchanging results charts with a partner?

    <p>To practice peer assessment techniques</p> Signup and view all the answers

    When plotting the graph, what should be included on the horizontal axis?

    <p>Distance of lamp from the test tube</p> Signup and view all the answers

    What should be stated in the conclusion concerning light intensity and photosynthesis?

    <p>As light intensity increases, the rate of photosynthesis increases</p> Signup and view all the answers

    What factor primarily contributes to the increase in sea level due to rising temperatures?

    <p>Expansion of water as it heats</p> Signup and view all the answers

    What is the estimated rise in sea level by the end of this century?

    <p>30 cm</p> Signup and view all the answers

    Which cities are mentioned as particularly vulnerable to sea level rise?

    <p>Shanghai, Mumbai, and Los Angeles</p> Signup and view all the answers

    How do droughts contribute to the risk of wildfires?

    <p>They create dry conditions that can easily ignite.</p> Signup and view all the answers

    What aspect of glaciers is highlighted concerning rising temperatures?

    <p>They are retreating as temperatures rise.</p> Signup and view all the answers

    What should you ensure about the water before beginning the experiment?

    <p>The water is really cold</p> Signup and view all the answers

    What is the first step in the method for conducting the experiment?

    <p>Read the temperature on the thermometer</p> Signup and view all the answers

    Which of the following apparatus is necessary for the experiment?

    <p>A conical flask</p> Signup and view all the answers

    What will happen when the lamp is placed close to the conical flask?

    <p>The water will slowly warm up</p> Signup and view all the answers

    What should you record on the results chart during the experiment?

    <p>Both the temperature and the water level</p> Signup and view all the answers

    Study Notes

    Photosynthesis Experiment

    • Place a plant in a test tube of water and ensure bubbles are coming from the cut end of the plant stem.
    • Measure the distance between a lamp and the test tube to set up an experiment.
    • Count the number of bubbles produced by the plant per minute.
    • Repeat the bubble count three times.
    • Move the lamp further from the test tube, measure the new distance, and repeat the bubble count.
    • Continue increasing the distance of the lamp from the test tube and recording the bubble count.
    • Calculate the average number of bubbles produced for each distance.
    • Plot a graph with the distance of the lamp from the test tube on the horizontal axis, and the average number of bubbles on the vertical axis.
    • As the distance of the lamp from the test tube increases, the light intensity decreases.
    • As the light intensity increases, the rate of photosynthesis increases.

    Testing Leaves for Starch

    • Boil a leaf in water to break down cell walls.
    • Transfer the leaf to ethanol to remove chlorophyll (the green pigment).
    • Heat the ethanol carefully to expedite the removal of chlorophyll from the leaf.

    Fossil Fuels

    • When organisms die, their remains may be buried under sediment in oxygen-free environments like peat bogs or deep ocean floors.
    • Over time, these remains are transformed by high pressure and heat into fossil fuels such as coal, oil, and natural gas.
    • Plants decomposing in swamps form coal over millions of years.
    • Fossil fuels contain carbon from the carbohydrates, fats, and proteins of the original organisms.
    • Burning fossil fuels releases carbon dioxide into the atmosphere.

    The Carbon Cycle

    • The formation and combustion of fossil fuels are key components of the carbon cycle.
    • The carbon cycle involves the movement of carbon through the environment via photosynthesis, respiration, decomposition, and the burning of fossil fuels.

    Global Warming and Sea Levels

    • Rising global temperatures contribute to sea level rise.
    • Warmer water expands, leading to increased sea levels.
    • Melting glaciers and ice caps add additional water to the oceans.
    • Sea level has been rising at a rate of about 3 mm per year.
    • Scientists estimate that over 600 million people are at risk from flooding due to rising sea levels by the end of this century.
    • Coastal megacities such as Shanghai, Mumbai, and Los Angeles are particularly vulnerable.

    Experiment: The Effects of Temperature on Sea Level

    • Cool water and ice cubes are used to simulate a change in the level of the ocean.
    • Fill two measuring cylinders to the same level with cool water and ice cubes.
    • The ice is allowed to melt in both cylinders.
    • One cylinder has ice in a funnel while the other does not.
    • The changes in water levels are observed and recorded.
    • This experiment demonstrates the link between rising temperatures and changes in water levels.

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    Science LB - Photosynthesis PDF

    Description

    This quiz covers a photosynthesis experiment involving the measurement of bubble production in plants under varying light conditions. It includes steps for testing leaves for starch and understanding the relationship between light intensity and photosynthesis rate. Perfect for students studying biology and plant science.

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