Sample Assessment Task IA1 Study Notes

Sample Assessment Task IA1

Data Test Overview

• Suggested Duration:

  • 10 minutes reading time

  • 60 minutes to complete the test

• Objective:

  • Apply a range of cognitions to respond to scientific data.

  • Test conducted under set timeframes and conditions.

Dataset 1: Investigation on Diffusion

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• Materials Used:

  • Agar jelly blocks infused with sodium hydroxide (alkali) and phenolphthalein indicator.

  • Dilute hydrochloric acid for immersion.

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• Observation:

  • Phenolphthalein indicator color change:

  • Pink (in alkali) to clear (in acid).

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• Experiment Details:

  • Students tested blocks of the same volume but different shapes, altering the surface area.

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• Results Summary: Table of Agar Blocks
  

  Block Number	Block Shape	Dimensions (cm)	Time (min)
  1	2cm x 2cm x 3cm	12	15
  2	1cm x 2cm x 6cm	12	80
  3	1cm x 1cm x 12cm	12	5
  Assessment Items for Dataset 1

  • Item 1: Identify the maximum distance of hydrochloric acid diffusion for total colour change to occur for block 1 in mm. (1 mark)

  • Item 2: Calculate the rate of diffusion in mm/min for block 3. (3 marks)

    • Formula:

    • ext{Diffusion Rate} = rac{ ext{Diffusion Distance (mm)}}{ ext{Time (min)}}

  • Item 3: Explain which shape showed the most efficient diffusion. (4 marks)

  • Item 4: Describe the trend between block shape and efficiency of diffusion. (1 mark)

  Dataset 2: Comparison of Plant and Animal Cells

  • Microscopy Investigation:

    • Students compared plant cells and animal cells.

  • Cell Sizes:

    • Cell A: 0.4 mm

    • Cell B: 3 mm

  Assessment Items for Dataset 2

  • Item 1: Calculate the size of cell A in millimetres. (2 marks)

  • Item 2: Calculate the size of cell B in millimetres. (2 marks)

  • Item 3: Calculate the percentage cover of the field of view diameter observed by cell B using x400 magnification. (2 marks)

  • Item 4: Compare cells A and B to determine which is a plant cell and which is an animal cell. (2 marks)

  Dataset 3: Effect of Temperature on Enzyme Activity

  • Experiment Details:

    • 20 x 1 cm³ blocks of fresh liver were placed into 20 test tubes.

    • Each test tube received 5 mL of hydrogen peroxide (H₂O₂) at different temperatures:

    • 10°C, 20°C, 30°C, and 40°C (five samples for each temperature).

  • Graphical Data:

    • Volume of O₂ produced (mL) vs. Temperature (°C):

    Temperature (°C)	Volume of O₂ (mL)
    10	50
    20	100
    30	70
    40	50

  Assessment Items for Dataset 3

  • Item 1: Identify the optimal temperature for enzyme activity. (1 mark)

  • Item 2: State the volume of oxygen gas produced at 30°C. (1 mark)

  • Item 3: Identify the temperature at which 50 mL oxygen gas is produced. (1 mark)

  • Item 4: Interpret the trend in catalase activity illustrated by the graphical data. (2 marks)

  Dataset 4: Cellular Respiration and Photosynthesis

  • Concept:

    • Energy transformations via cellular respiration and photosynthesis are described as inverse chemical reactions because the products of one serve as the raw materials for the other.

  • Graphical Data:

    • Rate of reaction for processes M and N in a vascular plant against light intensity (lux).

    Light Intensity (lux)	Rate of Reaction Process M (%)	Rate of Reaction Process N (%)
    10	20	10
    20	40	20
    30	60	30
    40	80	40
    50	100	50

  Assessment Items for Dataset 4

  • Item 1: Identify the light intensity that drives a 50% reaction rate for process M. (1 mark)

  • Item 2: Identify the reaction rate for process N at a light intensity of 50 lux. (1 mark)

  • Item 3: Predict the rate of reaction in percentage for process M at a light intensity of 80 lux. Justify your response. (2 marks)