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IGCSEScienceCambridge (CIE)Co-ordinated Sciences (Double Award)BiologyExam Questions6. Plant NutritionPhotosynthesis & Leaf Structure

Photosynthesis & Leaf Structure (Cambridge (CIE) IGCSE Co-ordinated Sciences (Double Award): Biology): Exam Questions

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Photosynthesis & Leaf Structure

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1
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An experiment is set up with four test tubes as shown in the diagram below. 

All four test tubes are left in sunlight for 6 hours. 

Which test tube would contain the least amount of dissolved carbon dioxide after 6 hours?

tv02bT3k_picture2

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    2
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    The diagram below shows a section through a leaf. 

    Which cell type would have the highest concentration of oxygen on a bright, sunny day?

    6-q7-cross-section

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      3
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      In what form do glucose molecules store energy?

      • Light

      • Heat

      • Chemical

      • Mechanical

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      4
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      Name the product of photosynthesis that diffuses out of a green leaf through its stomata.

      • Water

      • Oxygen

      • Carbon dioxide

      • Glucose

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      1
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      Which row of the table below shows the correct effects of deficiencies of essential minerals for plant growth?

       

      effect of magnesium ion deficiency

      effect of nitrate ion deficiency

      A

      yellow leaves

      stunted growth

      B

      stunted growth

      long roots

      C

      small leaves

      yellow leaves

      D

      stunted growth

      yellow leaves

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        2
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        Which of the following best describes the role of chlorophyll in photosynthesis?

        • Chlorophyll transfers light energy from the Sun because it has magnesium ions

        • Chlorophyll transfers chemical potential energy from sunlight into organic molecules which can be used to synthesise carbohydrates such as glucose

        • Chlorophyll transfers light energy from the Sun into chemical energy in inorganic molecules which can be used for growth

        • Chlorophyll transfers light energy into chemical potential energy in glucose molecules which are used in the synthesis of other carbohydrates

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        3
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        The average number of chloroplasts found in four different types of cell from the leaf of a plant are shown in the bar chart below.

        picture5

        What are the names of the four types of cell?

         

        1

        2

        3

        4

        A

        spongy mesophyll cell

        epidermal cell

        palisade mesophyll cell

        guard cell

        B

        palisade mesophyll cell

        guard cell

        spongy mesophyll cell

        epidermal cell

        C

        epidermal cell

        spongy mesophyll cell

        palisade mesophyll cell

        guard cell

        D

        palisade mesophyll cell

        spongy mesophyll cell

        guard cell

        epidermal cell

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          4
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          A student sets up an experiment to measure the rate of oxygen production of an aquatic plant when it is photosynthesising.

          The student repeated the experiment several times to calculate the average amount of oxygen collected.

          Which two factors should be kept constant during the student’s experiment?

          insert-diagram-6-q9-experiment

          • The size of the funnel and beaker.

          • The size of the aquatic plant and time exposed to light.

          • The size of the aquatic plant and the amount of water in the beaker.

          • The size of the aquatic plant and the amount of gas in the measuring cylinder.

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          Which of the following correctly identifies some of the molecules produced from the glucose synthesised by photosynthesis?

           

          1

          2

          3

          A

          cellulose for storage

          fats and oils for  energy storage

          starch to build cell walls

          B

          cellulose to build cell walls

          fats and oils for energy storage

          starch for storage

          C

          sucrose to be transported around the plant

          fats and oils for energy storage

          cellulose for storage

          D

          sucrose to be transported around the plant

          starch to build cell walls

          cellulose for storage

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            1
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            Two test tubes are set up with two similar leaves inside them, as shown in the diagram below.

            One test tube is exposed to light, while the other is kept in the dark.

            XCyLLKrC_picture8

             

            The test tubes are left for 4 hours.

            What colour will the hydrogencarbonate indicator solution be in each test tube?

             

            dark

            light

            A

            purple

            yellow

            B

            colourless

            yellow

            C

            purple

            colourless

            D

            yellow

            purple

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              2
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              A student sets up a photosynthesis experiment.

              A plant with striped leaves (similar to the one shown below) was kept in bright light for four hours. 

              K44yEXqo_picture9

              A leaf was removed from the plant and treated with ethanol in hot water to remove chlorophyll before iodine was used to test for starch.

              Which diagram shows the result of the test?

              • Mfy4pO4W_a
              • PzQA4t88_b
              • y599SIA0_c
              • c4bacQo5_d

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              3
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              The following could be used to write a balanced symbol equation for photosynthesis.

              1. 6CO2 + 6H2O

              2. CO2 + 6H2O

              3. Light and chlorophyll

              4. C6H12O6 + 6O2

              5. 6C6H12O6 + 6O2

              Which of the following represents the correct balanced chemical equation for photosynthesis?

              • 2 → 5 in the presence of 3

              • 2 → 4 in the presence of 3

              • 1 → 5 in the presence of 3

              • 1 → 4 in the presence of 3

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              4
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              The diagram below shows a cross-section through a leaf as seen under a microscope.

              picture14

              In which part of the leaf would the concentration of carbon dioxide be lowest on a warm, sunny day?

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