LIFE SCIENCES Paper 2 Memo (Eng) November 2009

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Life Sciences/P2 10 DoE/November 2009NSC – MemorandumSECTION CQUESTION 44.1 4.1.1 Volume of biogas produced (1)4.1.2 63/32 cm 3 (2)4.1.3 Use same amount of water in chicken manure and dried compostKeep all environmental conditions constantExtend the period of the investigationTake readings at shorter intervalsRepeat the investigation and find averagesInvestigation must be carried out jointly by John and NkosiNkosi and John must each do both experiments(Mark first TWO only) (2)4.1.4TypeTitle (Y)Volume of biogas produced per hour (cm 3 )18ScaleJoin CaptionKey or labellingof graphsVolume of biogas producedper hour (cm 3 )Rubric for the mark allocation 4 of the graph1614121086PlottingJoin Title (X)Correct type of graph 12Caption for graph 1Correct label for X-axis including unit 10Graphs labelled/key provided for 2 graphs 1Correct label for Y-axis including unit 1Appropriate scale for X-axis 0 1 2 3 4 15 6Appropriate scale for Y-axis 1Drawing of graphs1 – 1 to 2 points plotted correctlyTime ( 2 hours) – 3 to 5 points plotted correctly3 – 6 to 9 points plotted correctly4 – all 10 points plotted correctlyAll points joined for graph A 1All points joined for graph B 1Scale (X)NkosiJohn(13)(18)Copyright reservedPlease turn over
Life Sciences/P2 11 DoE/November 2009NSC – MemorandumNOTE:If the wrong type of graph is drawn:- Marks will be lost for ‘correct type of graph’- Marks will be lost for ‘joining of points’If graphs are not drawn on the same system of axes:- Mark the first graph only using the given criteriaIf axes are transposed:- Marks will be lost for labelling of ‘X-axis’ and ‘Y-axis’4.2 4.2.1 Lives in shallow waterDoes not need expensive fishing equipmentEasy to removeSessile/don't move(Mark first TWO only) any (2)4.2.2 - Limit the number caught- Only licensed fishermen may catchperlemoen- Stipulate minimum size of perlemoen thatcan be caught- Impose seasonal limitations- Heavy penalties/fines for those whocontravene regulations- Declare as a protective species- Patrol all beaches where perlemoen isfound- Improve education/awareness- Encourage perlemoen farming/mariculture- Establish marine protected areas(Mark first TWO only)- Introducestrictlegislationany(2)4.2.3 The perlemoen is a herbivore/occupies the second trophic levelIf the number of perlemoen is reduced:Energy at the first trophic level /algae that the perlemoen feedson, will increasebecause of decreased demand for algae / food by perlemoen.There will also be a decrease in the energy at the third trophiclevel/ organisms feeding on perlemoenbecause of decrease in food supply (perlemoen) available tothem.The energy flow through the habitat will thus be reducedany (3)(7)Copyright reservedPlease turn over
Page 1 and 2: NATIONALSENIOR CERTIFICATEGRADE 12L
Page 3 and 4: Life Sciences/P2 3 DoE/November 200
Page 9: Life Sciences/P2 9 DoE/November 200

LIFE SCIENCES Paper 2 Memo (Eng) November 2009

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