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Topic 5 Practice Paper: Plant nutrition — question paper

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QQ/IGCSE-BIO/T5

IGCSE · Cambridge IGCSE Biology (Extended (Core + Supplement))

Topic 5 Practice Paper

Plant nutrition

Duration: 40 minutes
Total: 30 marks
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Class:
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Date:

READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
  • Section B contains structured questions. Write your answers in the spaces provided.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total mark for this paper is 30.

Original practice material written against the Cambridge IGCSE Biology syllabus. It is not an official Cambridge examination paper. Topic 5: photosynthesis equations, uses of glucose, mineral ions, rate experiments, limiting factors, leaf structure.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

  1. 1

    Which word equation is correct for photosynthesis?

    1. Aglucose + oxygen → carbon dioxide + water
    2. Bwater + oxygen → carbon dioxide + glucose
    3. Ccarbon dioxide + glucose → water + oxygen
    4. Dcarbon dioxide + water → glucose + oxygen
    ( )
  2. 2

    In the balanced equation for photosynthesis, the coefficient of carbon dioxide is

    1. A1
    2. B3
    3. C6
    4. D12
    ( )
  3. 3

    Which mineral ion is needed to make chlorophyll?

    1. ANitrate
    2. BCalcium
    3. CPotassium
    4. DMagnesium
    ( )
  4. 4

    A variegated leaf turns blue-black with iodine only on its green patches after time in the light. Which factor is shown to be necessary?

    1. AChlorophyll
    2. BCarbon dioxide
    3. CLight
    4. DWater
    ( )
  5. 5

    Why must ethanol be heated in a water bath during the starch test?

    1. AEthanol evaporates too slowly otherwise
    2. BWater bath raises the boiling point
    3. CEthanol is flammable
    4. DEthanol dissolves iodine
    ( )
  6. 6

    Hydrogencarbonate indicator turns yellow in a tube containing a plant in the dark because

    1. Athe plant has released carbon dioxide by respiration
    2. Boxygen has dissolved in it
    3. Cthe dye has evaporated
    4. Dthe plant has photosynthesised rapidly
    ( )
  7. 7

    Which layer of the leaf is transparent and has no chloroplasts?

    1. APalisade mesophyll
    2. BUpper epidermis
    3. CSpongy mesophyll
    4. DGuard cells
    ( )
  8. 8

    Carbon dioxide reaches the palisade cells mainly by diffusing through

    1. Athe xylem
    2. Bthe waxy cuticle
    3. Cthe phloem
    4. Dthe stomata and air spaces
    ( )
  9. 9

    A pondweed gives 10 bubbles per minute at 50 cm from a lamp and 36 per minute at 20 cm. What is the percentage increase?

    1. A+26%
    2. B+260%
    3. C+36%
    4. D+360%
    ( )
  10. 10

    On a bright cold morning, warming a glasshouse raises the photosynthesis rate but adding lights does not. The limiting factor is

    1. Alight intensity
    2. Bcarbon dioxide
    3. Ctemperature
    4. Dwater
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 11

    A student investigates whether light is needed for photosynthesis. A destarched plant has one leaf half-covered with foil. After 48 hours in daylight the covered leaf is tested with iodine.

    1. (a)

      Explain why the plant is first left in the dark for 48 hours (destarching).

      [2]
    2. (b)

      State the expected result for the covered half and the uncovered half of the leaf.

      [2]
    3. (c)

      Explain how this experiment shows that light is needed for photosynthesis.

      [2]
  2. 12

    The rate of photosynthesis of a pondweed is measured by counting oxygen bubbles at different temperatures, with bright light and extra carbon dioxide throughout.

    Temperature / °C1020304050
    Bubbles per minute818303612
    1. (a)

      Describe and explain the effect of temperature on the rate between 10 °C and 40 °C.

      [3]
    2. (b)

      Explain why the rate falls sharply at 50 °C.

      [2]
    3. (c)

      Identify the limiting factor at 10 °C and explain how the student could confirm this.

      [2]
  3. 13

    A vertical section through a dicotyledonous leaf shows the following structures: waxy cuticle, upper epidermis, palisade mesophyll, spongy mesophyll with air spaces, lower epidermis with stomata and guard cells, and a vascular bundle containing xylem and phloem.

    1. (a)

      Name the structure that controls the opening between the leaf and the air, and state two substances that pass through it.

      [3]
    2. (b)

      State which vascular tissue brings water to the mesophyll cells and which carries sucrose away.

      [2]
    3. (c)

      Explain how one feature of the palisade mesophyll and one feature of the spongy mesophyll adapt the leaf for photosynthesis.

      [2]

— End of paper —