Biology IA Exemplar: Investigating how the color variety of Capsicum… | RevisionDojo

Loading document preview...

IB Biology HL Internal Assessment Example

Investigating how the color variety of Capsicum annuum ( green,light green, yellow, red and orange peppers ) affect their Vitamin C concentration as determined by the volume of juice required to decolorize 4.00 mL of 0.1 % DCPIP solution?HL

Official IB Result

IB Grade: 7

Criteria A: Research Design

6/6

Criteria StrandsPro

A.1Research question context

Excellent

A.2Methodological considerations

Good

A.3Methodology description

Good

Criteria Feedback

The student's research question is focused, measurable, and clearly linked to a specific biological context.
The student explains the redox basis of the investigation well and shows why DCPIP is an appropriate indicator for vitamin C.
The student's method includes several useful controls such as a fixed DCPIP volume, repeated titrations, and attention to temperature and oxidation.

The student needs to define the colour groups more rigorously so they are clearly tied to ripening rather than just appearance or cultivar differences.
The design does not fully address biological variation because repeated titrations on one extract are not the same as independent fruit replicates.
Some procedural details are still not specific enough for complete reproducibility, especially sample selection and how the final extract volume was ensured.

Criteria B: Data Analysis

5/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Poor

B.3Data processing quality

Poor

Criteria Feedback

The student's raw data are organised clearly, which makes the processing pathway easy to follow.
The student includes useful worked calculations, including the conversion from titre values to vitamin C concentration.
The student attempts to use statistics and uncertainty measures rather than relying only on the raw titres.

Several values are inconsistent across tables, calculations, and the written interpretation, which reduces confidence in the processed results.
The student's treatment of uncertainty is incomplete because it does not fully include all major sources of error in the method.
The statistical analysis is weakened because repeated titrations of one extract are treated as if they were independent biological samples.

Criteria C: Conclusion

6/6

Criteria StrandsPro

C.1Conclusion relevance and consistency

Moderate

C.2Scientific context comparison

Poor

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Criteria D: Evaluation

3/6

Criteria StrandsPro

D.1Methodological weaknesses

Good

D.2Improvements

Good

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Loading scores...

Official IB Result

IB Grade: 7

Criteria A: Research Design

6/6

Criteria StrandsPro

A.1Research question context

Excellent

A.2Methodological considerations

Good

A.3Methodology description

Good

Criteria Feedback

The student's research question is focused, measurable, and clearly linked to a specific biological context.
The student explains the redox basis of the investigation well and shows why DCPIP is an appropriate indicator for vitamin C.
The student's method includes several useful controls such as a fixed DCPIP volume, repeated titrations, and attention to temperature and oxidation.

The student needs to define the colour groups more rigorously so they are clearly tied to ripening rather than just appearance or cultivar differences.
The design does not fully address biological variation because repeated titrations on one extract are not the same as independent fruit replicates.
Some procedural details are still not specific enough for complete reproducibility, especially sample selection and how the final extract volume was ensured.

Criteria B: Data Analysis

5/6

Criteria StrandsPro

B.1Communication of data recording and processing

Moderate

B.2Consideration of uncertainties

Poor

B.3Data processing quality

Poor

Criteria Feedback

The student's raw data are organised clearly, which makes the processing pathway easy to follow.
The student includes useful worked calculations, including the conversion from titre values to vitamin C concentration.
The student attempts to use statistics and uncertainty measures rather than relying only on the raw titres.

Several values are inconsistent across tables, calculations, and the written interpretation, which reduces confidence in the processed results.
The student's treatment of uncertainty is incomplete because it does not fully include all major sources of error in the method.
The statistical analysis is weakened because repeated titrations of one extract are treated as if they were independent biological samples.

Criteria C: Conclusion

6/6

Criteria StrandsPro

C.1Conclusion relevance and consistency

Moderate

C.2Scientific context comparison

Poor

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Criteria D: Evaluation

3/6

Criteria StrandsPro

D.1Methodological weaknesses

Good

D.2Improvements

Good

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.