Life Sciences Grade 10 March Test 2022 Paper & Memo

Downloaded Downloaded from from hlayiso.com testpapers.co.za KWAZULU-NATAL PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE '• � •• • • • • • • iiii • • a m a _. II I\ II II II II II II II II II II II II 11 II II II II II II II � � �--•••••••••••••••••• •••·• •···-···•···-··· • •e� MARKS: 60 TIME: 1 hour ,;:; oo� This question paper consists of B pages. ';Dpy1 igl 1I rese1 ved

Downloaded from hlayiso.com INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. Answer ALL the questions. 2. Write ALL the answers in the ANSWER BOOK. 3. Start the answers to each question at the top of a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. � 5. Present your answers according to the instructions of each quest� 6. Do ALL drawings in pencil and label them in blue or black �(J'?• 7. Draw diagrams, tables or flow charts only when ask�� so. 8. The diagrams in this question paper are NOT n asarily drawn to scale. r 9. Do NOT use graph paper. 10. You may use a non-programmable c �or, protractor and a compass. t 11. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 3 March 2022 Common Test SECTION A QUESTION 1 1 .1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1.1 to 1.1.4) in your ANSWER BOOK, for example 1.1.4 D. 1.1.1 Which part of light microscope provide a source of light so that the object can be viewed? A Stage B Clip C Diaphragm D Mirror 1.1.2 Which of the following describes the oe�ayiour of chromosomes during anaphase of mitosis? A e�'\ Chromosomes align themselv�tlong the equator of the cell B Each chromosome replica e�and now has two chromatids C Chromatids of each chrom9some separate and are pulled to opposite poles of the e� D Chromosome appe�as a chromatin network 1.1.3 The organelles ti-e,�nthesize proteins are called ... A Ribosoml\ B Mito���dria C CIJ!proplast D h,cleoli �o 1.1.4 *�hich of the following is CORRECT about osmosis? OO A Solutes moves from region of high concentration to low concentration. B Particles moves from region of low concentration to high concentration. C Water moves from high concentration area to low concentration area. D Water moves from low concentration area to high concentration area. (4x2) 8) Copyright reserved Please turn over

Downloaded from hlayiso.com ure ;::,c1ences 1.:,raae ·,v 4 Maren L'ULL' �ommon I est 1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.4) in your ANSWER BOOK. 1.2.1 Fats that are liquid at room temperature 1.2.2 The structure that holds two chromatids together Me brane that surrounds a plant vacuole r Profess by which molecules move from a region of high • on entration to a region of low concentration 4x1 (4) 1.3 Indicate whether each of the statements in COLUMN I applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write A only, B only, both A and B, or none next to the question number {1.3.1 to1.3.4) in the ANSWER BOOK. COLUMN I COLUMN II 1.3.1 Contains the pigment/s in a A: Chromoplast plant cell B: Chloroplast 1.3.2 Monomers of proteins A: Fatty acids B: Amino acids 1.3.3 Lack of this vitamin/s causes A: Vitamin A rickets B: Vitamin B 1.3.4 A model used to explain how A: Fluid mosaic model enzymes function B: Lock and key model (4 x2) (8) TOTAL SECTION A: 20 Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 5 March 2022 Common Test SECTION B QUESTION 2 2.1 Study the diagram below showing a phase of mitosis. _.------ ,. ,, ,. ... ' • • ; C- M > \ \ I ✓ - • -----e I I I --===-s::::=----+---1---c • I ✓ \ ' '' ,, ; - ____ _ ... ... .... 2.1.1 Identify parts Band C respectively. ( 2) 2.1.2 State ONE function of part A. (1) 2.1.3 Identify the above diagram and give a reason for your answer. (2) 2.1.4 How many chromosomes were present at the beginning of this cell division? (1) 2.1.5 Write down ONE visible feature in the diagram that shows the phase of mitosis is taking place in an animal cell. (1) 2.1.6 Explain the significance of DNA replication during interphase. (2) (9) Copyright reserved Please turn over

Downloaded from hlayiso.com ure �c1ences l>raae 7 u March 2022 Common Test 2.2 An investigation was carried out to determine the effect of pH on enzyme activity, The results of the investigation are shown in the table below pH Enzyme activity (%) 6.0 3 6.5 20 7.0 60 7.5 98 8.0 40 8.5 3 9.0 0 2.2.1 What is the optimum pH for functioning of this enzyme? (1) 2.2.2 Identify the: (a) dependent variable (b) independent variable (2) 2_2_3 Use the information provided on the table to draw a line graph to present the results of the investigation. (6) 2.2.4 List TWO ways in which the reliability of this investigation could be increased. (2) (11) TOTAL QUESTION 2 (20) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 7 March 2022 Common Test QUESTION 3 3.1 Diagrams below show two types of cells. i.�··.. '/j' .•. • C X y 3.1.1 Which structure (X or Y) represent plant cell? (1) 3.1.2 Provide TWO visible reasons for your answer in QUESTION 3.1.1 (2) 3.1.3 Name the type of nucleic acid found at A (1 ) 3.1.4 Write ONLY the letter of the part that is the site for cellular respiration (1) 3.1.5 Explain what will happen to the cell if part B becomes impermeable (4) 3.1.6 Describe the events that will result in a cell if part D loses too much water (2) (11) Copyright reserved Please turn over

Downloaded from hlayiso.com Lite Sciences Grade 1 u March L'UZ! c;ommon I est 3.2 Study the micrograph of a cell organelle below. It was viewed under an ey e piece of 1Ox and objective lenses of 40x. 3.2.1 Identify the above diagram. (1) 3.2.2 Calculate the total magnification of this micrograph. (2) (3) 3.3 Proteins and carbohydrates are essential organic compounds in a human body need. A shortage on these compounds can cause serious illness. 3.3.1 Give TWO elements found in both proteins and carbohydrates. (2) 3.3.2 Describe the importance of proteins in a human body. ( 4) (6) TOTAL QUESTION 3: (20) TOTAL SECTION B: (40) GRAND TOTAL: [60] Copyright reserved

Downloaded from hlayiso.com 1 KWAZULU-NATAL PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE [ GRADE 10 ] /4,, � - ..-. - - --- - ------- - ..-. - - --- - ------- - ..-.--.. - --- - - ---- - ..-.--.. - --- - - ---- � � � � 1f LIFE SCIENCES MARCH2022 COMMON TEST 11 MARKING GUIDELINE ,, � � ����������������������������������������������� MARKS: 60 N.B This marking guideline consist of 7 pages.

Downloaded from hlayiso.com Life Sciences Grade 10 2022 2 KZN March Marking Guideline PRINCIPLES RELATED TO MARKING LIFE SCIENCES 1. If more information than marks allocated is given Stop marking when maximum marks is reached and put a wavy line and 'max' in the right-hand margin. 2. If, for example, three reasons are required and five are given Mark the first three irrespective of whether all or some are correcUincorrect. 3. If whole process is given when only a part of it is required Read all and credit the relevant part. 4. If comparisons are asked for but descriptions are given Accept if the differences/similarities are clear. 5. If tabulation is required but paragraphs are given Candidates will lose marks for not tabulating. 6 If diagrams are given with annotations when descriptions are required Candidates will lose marks. 7. If flow charts are given instead of descriptions Candidates will lose marks. If sequence is muddled and links do not make sense 8. Where sequence and links are correct, credit. Where sequence and links are incorrect, do not credit. If sequence and links become correct again, resume credit. 9. Non-recognised abbreviations Accept if first defined in answer. If not defined, do not credit the unrecognised abbreviation but credit the rest of the answer if correct. 10 Wrong numbering If answer fits into the correct sequence of questions but the wrong number is given, it is acceptable. 11. If language used changes the intended meaning Do not accept. 12. Spelling errors If recognisable, accept the answer, provided it does not mean something else in Life Sciences or if it is out of context. Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 2022 3 KZN March Marking Guideline 13. If common names are given in terminology Accept, provided it was accepted at the national memo discussion meeting. 14. If only the letter is asked for but only the name is given (and vice versa) 15. If units are not given in measurements Candidates will lose marks. Memorandum will allocate marks for units separately. 16. Be sensitive to the sense of an answer, which may be stated in a different way. 17. Caption All illustrations (diagrams, graphs, tables, etc.) must have a caption. 18. Code-switching of official languages (terms and concepts) A single word or two that appear(s) in any official language other than the learners' assessment language used to the greatest extent in his/her answers should be credited if it is correct. A marker that is proficient in the relevant official language should be consulted. This is applicable to all official languages. SECTION A QUESTION 1 1.1 1.1.1 D✓✓ 1.1.2 C✓✓ 1.1.3 A✓✓ 1.1.4 C✓✓ (2X4) (8) 1.2 1.2.1 Unsaturated fats✓ 1.2.2 Centromere✓ 1.2.3 Tonoplast✓ 1.2.4 Diffusion ✓ (lx4) (4) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 2022 4 KZN March Marking Guideline 1. 3 q:��ni-'1¥6� 1.3.3 None ✓ ✓ 1.3.4 B ✓ ✓ (2x4) (8) TOTAL SECTION A: 20 SECTION B QUESTION 2 Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 2022 5 KZN March Marking Guideline 2.1 2.1.1 j:i- �11Jll�brane� · uown�a�fnthnt>[Bm (2) 2.1.2 Part A transport substances in and out of the cell ✓ It surrounds the contents of the nucleus ✓ (MARK FIRST ONE ONLY) (1 ) 2.1.3 Telophase* ✓, because: Two daughter cells are present✓ OR Nucleolus reforms ✓ OR Nuclear membrane reforms ✓ Any 1 (2) *compulsory mark 2.1.4 21 two ✓ (1 ) 2.1.5 There is a cleavage furrow indicating the division of cytoplasm/ there is no cell plate dividing the cytoplasm ✓ (1 ) (MARK FIRST ONE ONLY) 2.1.6 It doubles genetic material ✓ To ensure that there are two copies of genetic material to be shared between the two resulting daughter cells ✓ (2) (9) 2.2 2.2.1 7,5 ✓ 2.2.2 (1 ) (a) Enzyme activity ✓ (b) pH ✓ (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 2022 6 KZN March Marking Guideline iJb nl -- 100 '$. 80 ·s: ·.;::: 60 Q,) 40 Q,) 20 0 6 6,5 7 7,5 8 8,5 9 pH Marking allocation of the graph Criteria Marks Correct type of qraph (TI 1 Caption ( C) 1 Correct labels with units in both Y & X-axis (L) 1 Correct scale in both Y and X- axis,(S) 1 Correct plotting (P) 1: 1- 5 points plotted correctly 2: all 7 points plotted correctly (6) 2.2.4 Increase sample size✓ Repeat investigation✓ (MARK FIRST TWO ONLY) (2) (11) TOTAL QUESTION 2 20 Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences Grade 10 2022 7 KZN March Marking Guideline QUESTION 3 3.1 3.1.1 X✓ (1) 3.1.2 large vacuoles present✓ has chloroplast ✓ has cell wall✓ has regular shape ✓ (MARK FIRST TWO ONLY) (2) 3.1.3 Nucleic acids ✓ (1) 3.1.4 C✓ (1) 3.1.5 Substances won't be able to go inside and outside of the cell ✓ Waste substances will accumulate inside the cells ✓ Resulting in a cell dying ✓ Useful substances won't be able to enter the cell ✓ Cause the shortage of useful substances inside the cell ✓ Leading to a cell becoming inactive or dying ✓ any4 (4) 3.1.6 The cell contents will shrink ✓ Pulling away the cell membrane from the cell wall✓ And that can lead to death of the cell / plant ✓ any2 (2) (11) 3.2 3.2.1 Mitochondrion✓ (1) 3.2.2 Total magnification= 10 x40✓ =400x✓ (2) (3) 3.3 3.3.1 Carbon✓ Hydrogen ✓ Oxygen ✓ (MARK FIRST TWO ONLY) (2) 3.3.2 Proteins act as an energy reserve✓ They are important in cell communication ✓ Helps repair and build body tissues✓ Allows metabolic reactions to take place✓ Catalysis reactions ✓ any (4xl) (4) (6) [20] TOTAL SECTION B: 40 GRAND TOTAL: 60 Copyright reserved