Sci 7.2
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Questions and Answers

What compound is produced as a result of photosynthesis that can be used for immediate energy?

  • Oxygen
  • Starch
  • Chlorophyll
  • Glucose (correct)

    • Which of the following statements accurately describes starch?

  • Starch is soluble in water and tastes sweet.
  • Starch is produced during photosynthesis and is insoluble in water. (correct)
  • Starch is a product of cellular respiration.
  • Starch serves as a primary energy source for animal cells.

    • In which way can we infer that photosynthesis has occurred in a plant?

  • By noting the temperature of the environment.
  • By detecting the presence of starch or oxygen in the plant. (correct)
  • By measuring the increase in plant height.
  • By observing the chlorophyll content in the leaves.

    • What is the significance of light energy in the process of photosynthesis?

    <p>It is converted into chemical energy stored in glucose.</p> Signup and view all the answers

    Which of the following best describes glucose in the given context?

    <p>It is a type of sugar that is soluble in water.</p> Signup and view all the answers

    What indicates the presence of starch in a leaf during the iodine test?

    <p>The leaf turns blue-black.</p> Signup and view all the answers

    What is the purpose of adding dilute sodium hydrogencarbonate solution in the photosynthesis experiment?

    <p>To provide carbon dioxide for photosynthesis.</p> Signup and view all the answers

    What is the role of the table lamp in the experiment testing for oxygen produced during photosynthesis?

    <p>To illuminate the plant and facilitate photosynthesis.</p> Signup and view all the answers

    How is oxygen collected in the photosynthesis experiment ?

    <p>By capturing bubbles produced in the test tube.</p> Signup and view all the answers

    What safety precaution should be taken when using iodine solution?

    <p>Avoid any contact with skin.</p> Signup and view all the answers

    What safety measure must be taken while performing the experiment involving the Bunsen burner?

    <p>Safety spectacles must be worn.</p> Signup and view all the answers

    What is the purpose of boiling the leaf in alcohol during the experiment?

    <p>To extract chlorophyll from the leaf cells.</p> Signup and view all the answers

    What should be done with the leaf after it has been in the alcohol?

    <p>It should be rinsed in cold water to remove alcohol.</p> Signup and view all the answers

    What is a characteristic of the boiling tube once the chlorophyll is dissolved?

    <p>The liquid turns green.</p> Signup and view all the answers

    Which tool is recommended for placing the leaf into the boiling tube?

    <p>A pair of forceps or a glass rod</p> Signup and view all the answers

    What happens to the leaf during the process of boiling in alcohol?

    <p>It loses its green pigment.</p> Signup and view all the answers

    What is the chemical formula for a carbon dioxide molecule?

    <p>CO2</p> Signup and view all the answers

    What does the number before a chemical formula in a chemical equation represent?

    <p>The ratio of different types of molecules involved in the reaction</p> Signup and view all the answers

    Which of the following statements about a water molecule is correct?

    <p>It contains 2 hydrogen atoms and 1 oxygen atom.</p> Signup and view all the answers

    What molecules are involved in the process of photosynthesis ?

    <p>Glucose and oxygen</p> Signup and view all the answers

    How many hydrogen atoms are present in a glucose molecule?

    <p>12</p> Signup and view all the answers

    Which of the following accurately describes the composition of an oxygen molecule?

    <p>It consists of 2 oxygen atoms.</p> Signup and view all the answers

    What happens to some glucose produced in photosynthesis?

    <p>It is used to produce starch and stored for later.</p> Signup and view all the answers

    Which statement regarding the molecular information presented is false?

    <p>A glucose molecule has the lowest number of hydrogen atoms compared to glucose.</p> Signup and view all the answers

    Which part of the plant's leaves is responsible for photosynthesis?

    <p>Green parts containing chlorophyll</p> Signup and view all the answers

    What is the main role of chlorophyll in photosynthesis?

    <p>To capture light energy for converting it into chemical energy</p> Signup and view all the answers

    Which of the following substances is necessary for photosynthesis?

    <p>Carbon dioxide</p> Signup and view all the answers

    In the context of the experiment, what is the purpose of the destarched plant?

    <p>To show that no starch is present before photosynthesis begins</p> Signup and view all the answers

    What can be inferred about the supply of water regarding photosynthesis?

    <p>Water is one of the essential raw materials for the photosynthesis process</p> Signup and view all the answers

    Which environmental factor must be controlled to avoid affecting the rate of photosynthesis?

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

    What is the primary role of algae in the ocean?

    <p>Producing more than half of the Earth's oxygen</p> Signup and view all the answers

    Which statement accurately describes the process of photosynthesis?

    <p>It transforms carbon dioxide and water into glucose and oxygen.</p> Signup and view all the answers

    In the equation $6 CO_2 + 6 H_2O \rightarrow C_6H_{12}O_6 + 6 O_2$, what does $C_6H_{12}O_6$ represent?

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

    What factor is NOT necessary for photosynthesis to occur?

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

    How do plants utilize glucose produced during photosynthesis?

    <p>For immediate energy or stored as starch</p> Signup and view all the answers

    Which of the following correctly identifies the relationship between producers and consumers in food chains?

    <p>Producers are primarily plants and algae, while consumers are mainly animals.</p> Signup and view all the answers

    What is the significance of chlorophyll in the photosynthesis process?

    <p>It captures light energy needed for glucose production.</p> Signup and view all the answers

    Study Notes

    Photosynthesis

    • Plants make their own food through photosynthesis
    • Photosynthesis is how plants obtain energy and grow
    • Plants don't eat, they use photosynthesis to produce their own food
    • Photosynthesis mainly occurs in leaves
    • Chloroplasts are found in green leaf cells
    • Chlorophyll is a green pigment inside chloroplasts
    • Chlorophyll absorbs light energy to fuel photosynthesis

    Process of Photosynthesis

    • Light energy converts carbon dioxide and water into food (glucose)
    • Oxygen is also produced as a byproduct
    • Light energy is converted into chemical energy during photosynthesis
    • Food (glucose) and oxygen are the products of photosynthesis
    • The materials used, like carbon dioxide and water, are reactants in photosynthesis
    • Photosynthesis is a chemical change, forming new substances
    • A physical change does not form new substances

    Chemical Equation of Photosynthesis

    • 6CO2 + 6H2O → C6H12O6 + 6O2
    • The numbers before the chemical formulas indicate the ratio of different types of molecules involved in the reaction

    Starch

    • Some glucose produced during photosynthesis is used immediately for energy
    • Excess glucose is converted into starch and stored in green leaf cells for later use
    • Starch is another product of photosynthesis
    • Starch is a type of sugar, insoluble in water, and doesn't taste sweet. Examples of starchy foods are rice and potatoes.
    • Glucose is soluble in water and tastes sweet. Examples of foods rich in glucose are grapes and honey.

    Testing for Starch

    • Iodine solution is used to test for starch
    • Iodine solution turns blue-black when it comes into contact with starch
    • Iodine solution remains brown when it comes into contact with distilled water

    Testing for Starch in a Leaf

    • Boiling a leaf in water helps to destroy cell membranes and make the cells permeable to alcohol and iodine solutions.
    • Boiling alcohol helps to dissolve chlorophyll and allows for easier viewing of any colour change.
    • Iodine solution can be used to test for starch

    Factors for Photosynthesis

    • Light is essential for photosynthesis
    • Plants need carbon dioxide and water as reactants in photosynthesis
    • Chlorophyll is essential for photosynthesis, since chlorophyll absorbs light energy
    • Plants destarch to ensure that any starch detected in experiments is produced during the experiment, not earlier. To destarch, plants are placed in the dark for 24 hours.

    Importance of Photosynthesis

    • Photosynthesis provides energy for other living things through feeding
    • Photosynthesis produces oxygen as a byproduct, which is vital for most living things
    • Producers in food chains are plants that make their own food.
    • Consumers depend on producers or other consumers in food chains.

    Photosynthesis in Aquatic Environments

    • Algae and some bacteria in water also engage in photosynthesis.

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    Related Documents

    OCR GCSE Science 7.2 Photosynthesis PDF

    Description

    Test your knowledge on the process of photosynthesis with this quiz. Covering critical aspects such as the production of glucose, the significance of light energy, and identifying starch, this quiz is perfect for students studying biology. Prepare to challenge your understanding of plant energy production and related experiments.

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