Biology Data Test Study Notes

Biology Data Test Overview

  • Instrument Number: FA1 (Mock Test)

  • Unit: Unit 1: Cells and Multicellular Organisms

  • Topic: Topic 1: Cells as the Basis of Life

  • Conditions:

    • Response Type: Short response

    • Time Limit: 60 minutes

    • Perusal Time: 10 minutes

    • Response Length: Up to 500 words, including:

      • Short responses (sentence or short paragraphs)

      • Written paragraphs (50–250 words each)

      • Other types of responses (e.g., interpreting/calculating)

    • Equipment: Queensland-approved graphics calculator permitted

    • Stimulus: Unseen stimulus

  • Instructions:

    • Use datasets to respond to corresponding items.

    • Record all answers on the examination paper.

  • Criteria for Marks:

    • Data test based on Assessment Objectives 2, 3, 4

    • Total Marks: 10

Data Test Marks Summary

  • Dataset Items:

    1. Application of understanding

    2. Analysis of evidence

    3. Interpretation of evidence

  • Marks Allocated to Each Item:

    • Item 1: 2 marks

    • Item 2: 2 marks

    • Item 3: 2 marks

    • Item 4: 2 marks

    • Item 5: 1 mark

    • Item 6: 3 marks

    • Item 7: 2 marks

    • Item 8: 3 marks

    • Item 9: 3 marks

  • Total Marks Summary:

    • Apply Understanding: 6 marks

    • Analyze Evidence: 6 marks

    • Interpret Evidence: 8 marks

    • Overall Total: 20 marks (100%)

  • Percentage Breakdown:

    • Apply Understanding: 30%

    • Analyze Evidence: 30%

    • Interpret Evidence: 40%

Dataset 1: Passive Protein Channels and Glucose Uptake

  • Study Overview: Investigated the effect of passive protein channels on glucose movement into cells.

  • Key Focus:

    • Glucose uptake rates in erythrocytes through:

      • Simple diffusion

      • Facilitated diffusion

Item 1: Apply Understanding

  • Task: Identify glucose uptake rate at external concentration of 10 mmol/dm³.

    • Simple diffusion: Answer: ___ mmol/cm³/h

    • Facilitated diffusion: Answer: ___ mmol/cm³/h

Item 2: Analyze Evidence

  • Task: Contrast effects of increasing external glucose concentration on glucose uptake for:

    • Facilitated diffusion

    • Simple diffusion

  • Guidance for Response: Discussing the differences in uptake rates as glucose concentration increases, considering saturation levels and channel availability.

Item 3: Interpret Evidence

  • Task: Predict the effect on glucose uptake by facilitated diffusion when increasing external concentration to 30 mmol/dm³.

  • Justification: Must justify predictions based on understanding of transport mechanisms.

Dataset 2: Rate of Photosynthesis in Elodea Pondweed

  • Experiment Overview: Measured photosynthesis rate by counting bubbles rising from cut elodea.

  • Experimental Setup: Vary lamp distances and count bubbles.

Table 1: Bubbles Counted at Various Distances

Distance (d in cm)

Trial 1

Trial 2

Trial 3

Trial 4

Mean

10

52

52

54

54

53

20

49

51

48

52

50

30

32

30

27

31

30

40

30

10

9

11

____

Item 4: Apply Understanding

  • Task: Calculate mean number of bubbles at 40 cm from the pondweed.

    • Calculated Mean:

    • Mean number of bubbles at 40 cm = ____ bubbles/min

Item 5: Analyze Evidence

  • Task: Identify trends shown in the results from Table 1.

  • Guidance for Response: Discuss the relationship between distance from light source and photosynthesis rate.

Item 6: Interpret Evidence

  • Task:
    (i) Sketch the curves for photosynthesis rates of different plant types (a bean plant and an oxalis plant) considering light intensity.
    (ii) Justify differences in curves between sun plant and shade plant.

  • Guidance for Response: Describe adaptations of plants to different light conditions and corresponding photosynthetic efficiency.

Dataset 3: Surface-Area-to-Volume Ratio (SA:V)

  • Definition: The ratio of surface area to volume, significant for cells and biological organisms.

  • Importance: Affects biological processes such as diffusion, nutrient absorption, and waste elimination.

Table 2: Measurements of SA:V for Cell Shapes

Cell Shape

Length

Surface Area

Volume

SA:V

Cube (L=2 µm)

2 µm

24 µm²

8 µm³

3

Cube (L=5 µm)

5 µm

150 µm²

125 µm³

1.2

Cylinder (r=1 µm, h=2.55 µm)

22.31 µm²

8 µm³

____

Sphere (r=1.24 µm)

19.32 µm²

8 µm³

____

Item 7: Apply Understanding

  • Task: Calculate SA:V ratios for cylinder and sphere. Show working and add results to the table.

Item 8: Analyze Evidence

  • Task: Compare shapes of the cells and identify the most efficient shape and size for a cell based on measurements.

  • Guidance for Response: Consider diffusion rates and metabolic needs of cells of differing sizes and shapes.

Item 9: Interpret Evidence

  • Task: Discuss whether a platypus should remain elongated or curl into a sphere to conserve heat. Justify with reference to SA:V principles.

  • Guidance for Response: Apply principles of heat retention and the implications of surface area relative to volume.

Instrument-Specific Marking Guide (ISMG)

  • Assessment Objectives:

    1. Apply understanding of cells and multicellular organisms to scientific data.

    2. Analyze evidence to identify trends and relationships in datasets.

    3. Interpret evidence to conclude based on data analysis.

Performance Criteria:

  • Cut-offs:

    • >90%: 10 marks

    • >80%: 9 marks

    • >70%: 8 marks

    • >60%: 7 marks

    • >50%: 6 marks

  • Performance Insights:

    • Predicted behaviors using scientific concepts.

    • Correct calculations using representations of scientific relationships.

    • Appropriate analytical technique use.

    • Valid conclusion drawing from evidence interpretation.

Summary of Assessment Characteristics

  • Characteristics for Excellent Performance:

    • Consistency in demonstrating scientific concepts, theories, models, and predicting behaviors.

    • Correct quantity calculations and trend identification.

    • High-quality evidence interpretation resulting in sound conclusions.