Life Sciences Grade 11 P3 2013 Memo (Eng)

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 11 LIFE SCIENCES P3 (PRACTICAL) EXEMPLAR 2012 MEMORANDUM MARKS: 60 This memorandum consists of 5 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences/P3 (Practical) 2 DBE/2013 NSC – Grade 11 Exemplar – Memorandum QUESTION 1 1.1 Use the following checklist to assess the manipulation of apparatus: CRITERIA DESCRIPTION MARK Set up a water Use the tripod, wire gauze, beaker and 1 bath Bunsen burner/hot water√ Place a green leaf Remove a green leaf from the plant and place in the water bath for 10 to 20 seconds in hot water √ using a 1 forceps√ 1 Test tube with Fill test tube/small beaker ¾ full √ with 1 alcohol/methylated alcohol/methylated spirits and spirits place it in the water bath√ 1 Remove leaf from Use the forceps to remove leaf from water √ 1 water bath bath and place in test tube √ /small beaker 1 with alcohol/methylated spirits Remove the leaf Use the forceps to remove the leaf from the from test tube/ test tube/small beaker and place into the 1 small beaker water bath√ Leaf in water bath Wash√/rinse the leaf in the water bath 1 Remove leaf from Use the forceps and remove the leaf from the water bath water bath √ and 1 spread √ the leaf out onto 1 a watch glass √ /saucer/petri dish 1 Iodine solution Use a pipette√ /dropper to add iodine solution 1 √ onto the leaf 1 Clean up Wash and dry apparatus and place back for 1 next person TOTAL 15 QUESTION 2 2.1 Enzyme A √ will digest starch√ into glucose√ Enzyme B √ will digest starch√ into glucose√ (3) 2.2 (a) Enzyme√ (1) (b) Conversion of starch into glucose√ (1) (c) Same temperature √ /Same amount of starch/Same amount of enzyme/ identical test-tube or beaker (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences/P3 (Practical) 3 DBE/2013 NSC – Grade 11 Exemplar – Memorandum 2.3 1. Make two solutions√ of the same amount of starch √, and warm water √ in two test tubes (test tube 1 and 2). 2. Place 5 ml of enzyme A√ in test tube 1, and 3. 5 ml of enzyme B√ in the test tube 2 4. Allow apparatus to stand√ for an hour 5. Test the solutions in the test tubes for glucose√, by adding Benedict's solution/Fehlings A+B√ 6. Place the test tubes in a hot water bath √ 7. If the contents change from light blue to green/yellow/orange in the test tube √ then the enzyme has digested starch to glucose√ and the hypothesis must be accepted for the chosen enzyme 8. If the contents remain blue in the test tube √ then the enzyme has not digested starch to glucose√ and the hypothesis must be rejected for the chosen enzyme any (9) [15] QUESTION 3 3.1 To determine how the rate of photosynthesis√ changes over time√. (2) 3.2 Size of pond weed √ the amount of water √ and the size of the test tube√ any (2) 3.3 Time of 06:00 09:00 12:00 15:00 18:00 21:00 day Number of 2 6 20 20 10 0 bubbles Marking checklist for drawing the table CRITERIA DESCRIPTION MARKS Labels Both labels correct 1 One/two label(s) incorrect 0 Time of day All six readings correct 1 1–5 readings incorrect 0 Number of bubbles All six readings correct 1 1–5 readings incorrect 0 3 + 1 for drawing of table (4) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences/P3 (Practical) 4 DBE/2013 NSC – Grade 11 Exemplar – Memorandum 3.4 25 Number of bubbles released during 24 hours 20 Number of bubbles 15 10 5 0 06:00 09:00 12:00 15:00 18:00 21:00 Time of the day Allocation of marks for plotting the bar graph: Correct type of graph/ 1 bar graph Title of graph 1 Correct labels for X-axis and Y-axis 1 Plotting of bars 2: Plotted all 6 1: Plotted 4 to 5 0: Plotted 0 to 3 bars bars correctly bars correctly correctly If the wrong type of graph is drawn, marks will be lost for correct type of graph and plotting of bars. (5) 3.5 The rate of photosynthesis increases from 06:00 to 12:00√, remains stable to 15:00√ and then decreases thereafter until it stops √ any (2) [15] Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences/P3 (Practical) 5 DBE/2013 NSC – Grade 11 Exemplar – Memorandum QUESTION 4 4.1.1 A – Pelvis  B – Urether C – Medulla E – Cortex  F – Renal pyramid√ (5) 4.1.2 D – Renal capsule to protect the kidney (2) 4.1.3 Insulates the kidneys /keeps them in position/prevents injury any (1) (8) 4.2 Drawing of a moss plant √ illustrating the gametophyte and sporophyte Capsule√ Seta/Stalk √ Sporophyte√ ‘Leaves’√ Gametophyte√ ‘Stem’√ Rhizoids√ Allocation of marks: Caption: 1 mark Drawing: 1 mark for including the sporophyte and gametophyte in the drawing Labels: 5 marks for any 5 labels (7) [15] TOTAL: 60 Copyright reserved