Description Marks Appropriate source of information cited to allow it to be found 1 summarised 1–2 Total /3 Answer include, but is not limited to: Aspects that may be in a summary of include: weight usually increases up to adulthood and then decreases whether the sheep was single or twin birth, which will affect fleece weight nutrition will affect fleece weight. Identify the following variables for the investigation: (a) Independent variable what is being changed? – Description Age of sheep 1 Total /1 (b) Dependent variable what is measured? – Description Fleece weight 1 /1 Sheep frame size or bodyweight could possibly influence fleece weight, creating a degree of experimental error. In this investigation, this error will be minimised by averaging the fleece weights for each age group. (a) Describe another method that could be used to minimise errors due to differences in sheep frame size or bodyweight. Description Marks Suitable method described 1–2 Total /2 Answer include, but is not limited to: include only of similar frame size or bodyweight in the study express fleece weight as fleece weight per kg of bodyweight. (b) Identify two factors, other than age and frame size, that could affect fleece weight. Description Two factors identified 1–2 /2 Answer could include, but is not limited to: Possible factors may include: whether the was single or multiple birth feed conditions environmental conditions conditioning age of first shearing
Description Marks Appropriate source of information cited to allow it to be found 1 summarised 1–2 Total /3 Answer include, but is not limited to: Aspects that may be in a summary of include: weight usually increases up to adulthood and then decreases whether the sheep was single or twin birth, which will affect fleece weight nutrition will affect fleece weight. Identify the following variables for the investigation: (a) Independent variable – what is being changed? Description Age of sheep 1 Total /1 (b) Dependent variable – what is measured? Description Fleece weight 1 /1 Sheep frame size or bodyweight could possibly influence fleece weight, creating a degree of experimental error. In this investigation, this error will be minimised by averaging the fleece weights for each age group. (a) Describe another method that could be used to minimise errors due to differences in sheep frame size or bodyweight. Description Marks Suitable method described 1–2 Total /2 Answer include, but is not limited to: include only of similar frame size or bodyweight in the study express fleece weight as fleece weight per kg of bodyweight. (b) Identify two factors, other than age and frame size, that could affect fleece weight. Description Two factors identified 1–2 /2 Answer could include, but is not limited to: Possible factors may include: whether the was single or multiple birth feed conditions environmental conditions conditioning age of first shearing
Animal-Production-Systems-General-Y12-sample-assessment-tasks-WACE-2015_16.DOCX