Biology IA Exemplar: How does matcha tea concentration (0%, 0.5%,… | RevisionDojo

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IB Biology SL Internal Assessment Example

How does matcha tea concentration (0%, 0.5%, 1.0%, and 2.0% w/v) affect the germination outcome (germinated vs. not germinated) of Vigna radiata seeds after 72 hours, where germination is defined as the visible protrusion of the radicle through the seed coat?SL

Official IB Result

IB Grade: 7

Criteria A: Research Design

6/6

Criteria StrandsPro

A.1Research question context

Excellent

A.2Methodological considerations

Excellent

A.3Methodology description

Excellent

Criteria Feedback

The student framed a focused, testable question with a clear concentration range, organism, time frame, and germination criterion.
The student placed the investigation in a strong biological context by linking matcha catechins, ROS, and prior research on mung beans.
The student's method is detailed enough that another student could largely repeat the investigation.

A few procedural details are still missing, especially how bowl position and temperature were controlled.
The handling of matcha as a suspension could have been explained more clearly to show that each aliquot received the same concentration.
The materials and procedure are not perfectly aligned in a few places, which leaves small ambiguities.

Criteria B: Data Analysis

6/6

Criteria StrandsPro

B.1Communication of data recording and processing

Excellent

B.2Consideration of uncertainties

Good

B.3Data processing quality

Good

Criteria Feedback

The student's raw data are recorded clearly and consistently, with all replicate counts shown and easy to trace into totals.
The student processes the data in a way that is relevant to the question, including germination percentages, standard deviations, and a chi-square test.
The student's tables and graph are generally well organised and make the pattern in the results easy to follow.

The student's uncertainty treatment is helpful, but some of the assumptions behind the uncertainty values are not fully justified.
The chi-square write-up would be clearer with more accurate notation and a fuller explanation of the test structure.
The student does not fully address the independence assumption of the data, even though the seeds were grouped by bowl.

Criteria C: Conclusion

6/6

Criteria StrandsPro

C.1Conclusion relevance and consistency

Good

C.2Scientific context comparison

Good

Criteria Feedback

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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

4/6

Criteria StrandsPro

D.1Methodological weaknesses

Excellent

D.2Improvements

Excellent

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

Excellent

A.3Methodology description

Excellent

Criteria Feedback

The student framed a focused, testable question with a clear concentration range, organism, time frame, and germination criterion.
The student placed the investigation in a strong biological context by linking matcha catechins, ROS, and prior research on mung beans.
The student's method is detailed enough that another student could largely repeat the investigation.

A few procedural details are still missing, especially how bowl position and temperature were controlled.
The handling of matcha as a suspension could have been explained more clearly to show that each aliquot received the same concentration.
The materials and procedure are not perfectly aligned in a few places, which leaves small ambiguities.

Criteria B: Data Analysis

6/6

Criteria StrandsPro

B.1Communication of data recording and processing

Excellent

B.2Consideration of uncertainties

Good

B.3Data processing quality

Good

Criteria Feedback

The student's raw data are recorded clearly and consistently, with all replicate counts shown and easy to trace into totals.
The student processes the data in a way that is relevant to the question, including germination percentages, standard deviations, and a chi-square test.
The student's tables and graph are generally well organised and make the pattern in the results easy to follow.

The student's uncertainty treatment is helpful, but some of the assumptions behind the uncertainty values are not fully justified.
The chi-square write-up would be clearer with more accurate notation and a fuller explanation of the test structure.
The student does not fully address the independence assumption of the data, even though the seeds were grouped by bowl.

Criteria C: Conclusion

6/6

Criteria StrandsPro

C.1Conclusion relevance and consistency

Good

C.2Scientific context comparison

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.

Criteria D: Evaluation

4/6

Criteria StrandsPro

D.1Methodological weaknesses

Excellent

D.2Improvements

Excellent

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.