2020HSCShort answer

Q25 (a)

3 marks

Question

Students tested the hypothesis that the number of eggs/young produced was greater in animals using external fertilisation than those using internal fertilisation. They obtained the following data from secondary sources.
What conclusion can be drawn from the data? Justify your answer.

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Solution

Criteria	Marks
• Draws an appropriate conclusion from the data<br>• Uses the data to provide justification for the validity of the conclusion	3
• Draws a relevant conclusion<br>• Uses the data to provide a reason for the conclusion	2
• Provides some relevant information about the data	1

Sample answer:

Since there is little difference between the mean numbers of young/eggs produced in animals using the two modes of reproduction, and the variability of the data is large as shown by the standard deviations, the students could conclude that there is no difference between the number of young produced and the mode of fertilisation.

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Module 5 · Heredity

ReproductionCompare sexual and asexual reproduction across animals, plants, fungi, bacteria and protists.

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