# Agricultural Sciences Grade 11 P1 2020 Memo (Eng)

> Grade 11 Agricultural Sciences Paper 1 memorandum from the National Exemplar November Exam 2020 (English), 9 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/agric-sciences-p1-gr11-memo-nov2020-english/26e03b18-6990-486f-a6cf-e689dc5208b2
- Updated: 2026-09-27
- Subject: Agricultural Sciences
- Grade: Grade 11
- Language: English
- Document type: Memorandum
- Year: 2020
- Exam period: National Exemplar November Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 9

Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 11](https://www.hlayiso.com/library/grade-11) › [Agricultural Sciences](https://www.hlayiso.com/library/grade-11/agricultural-sciences) › [Agricultural Sciences Grade 11 P1 2020 Memo (Eng)](https://www.hlayiso.com/library/agric-sciences-p1-gr11-memo-nov2020-english/26e03b18-6990-486f-a6cf-e689dc5208b2)

## About this document

Agricultural Sciences · Grade 11 · National Exemplar November Exam · 2020 · English. Memorandum, 9 pages. Read online or download the PDF.

Read it free online on the page above; download the PDF from there.

## Matching paper and memo

- [AGRIC SCIENCES P1 GR11 QP NOV2020 English](https://www.hlayiso.com/library/agric-sciences-p1-gr11-qp-nov2020-english/173f049f-a685-4d1e-880b-1532d35e0c0e) — QP · 2020 · Eng

## Document text

Text extracted from the PDF. Layout, diagrams and tables may not survive extraction.

### Page 1

NATIONAL
                    SENIOR CERTIFICATE

                            GRADE 11

                      NOVEMBER 2020

               AGRICULTURAL SCIENCES P1
                  MARKING GUIDELINE
                      (EXEMPLAR)

MARKS:   150

                  This marking guideline consists of 9 pages.

### Page 2

2                          AGRICULTURAL SCIENCES P1           (EC/NOVEMBER 2020)

 SECTION A

 QUESTION 1

 1.1 1.1.1      C 
     1.1.2      D 
     1.1.3      C 
     1.1.4      A 
     1.1.5      C 
     1.1.6      D 
     1.1.7      A 
     1.1.8      B 
     1.1.9      D 
     1.1.10     B                                             (10 x 2)    (20)

 1.2 1.2.1      B only 
     1.2.2      A only 
     1.2.3      None 
     1.2.4      B only 
     1.2.5      Both A and B                                    (5 x 2)   (10)

 1.3 1.3.1      Halogen 
     1.3.2      Lewis structure 
     1.3.3      Loam 
     1.3.4      Nitrogen 
     1.3.5      Colloid                                         (5 x 2)   (10)

 1.4 1.4.1      Cation 
     1.4.2      Hygroscopic 
     1.4.3      Acid 
     1.4.4      Mycorrhiza 
     1.4.5      Illuviation                                      (5 x 1)        (5)

                                                      TOTAL SECTION A:           45

Copyright reserved                                            Please turn over

### Page 3

(EC/NOVEMBER 2020)                    AGRICULTURAL SCIENCES P1                          3

 SECTION B

 QUESTION 2: BASIC AGRICULTURAL CHEMISTRY

 2.1 Compounds

       2.1.1    Classification of compounds
                A – Organic 
                B – Inorganic                                                         (2)

       2.1.2    Reason
                A – Presence of carbon atom 
                B – Absence of carbon atom                                            (2)

       2.1.3    Name of compounds with the same molecular formula but
                different structure
                Isomers                                                               (1)

       2.1.4    Chemical formula of a compound represented by structure A
                 C4H10 
                                        OR
                 CH3 (CH2)2 CH3                                                     (2)

       2.1.5    Identification of the letter
                (a) C 
                (b) B                                                                 (2)

 2.2 Matter/elements/compounds/mixtures

       2.2.1    Identification of substances
                A – Compound 
                B – Homogeneous mixture 
                C – Heterogeneous mixture                                             (3)

       2.2.2    Difference between an element and a compound
                Element is a substance that cannot be broken down by chemical
                means 
                Compound is a substance formed when two or more elements are
                chemically combined                                                   (2)

       2.2.3    Distinguishing between homogeneous and heterogeneous
                mixtures
                Homogeneous – mixture in which the dissolved solute cannot be
                separated from the solvent by physical means 
                Heterogeneous – mixture in which the components can be
                separated by physical means                                           (2)

Copyright reserved                                                  Please turn over

### Page 4

4                            AGRICULTURAL SCIENCES P1                         (EC/NOVEMBER 2020)

 2.3 Fatty acids

       2.3.1    Identification of the fatty acid
                A – Unsaturated fatty acid 
                B – Saturated fatty acid                                                        (2)

       2.3.2    Indication of the letter representing the fatty acid

                (a) Originating from plants   – A
                (b) Solid at room temperature – B 
                (c) Has a high melting point – B 
                (d) Liquid at room temperature – A                                              (4)

       2.3.3    TWO importance of fats in living organisms
                 Provide a source of stored energy 
                 Source of insulation and temperature control 
                 Vital part of membrane structure 
                 Play a role in the flow of energy in and out of living cells 
                 Assist in signal transduction                                 (Any 2)         (2)

 2.4 pH values

       2.4.1    Indicating the pH of substances

                Baking powder – Alkaline 
                Orange juice – Acidic 
                Milk          – Neutral 
                Battery acid  – Strongly acidic                                                 (4)

       2.4.2    Indicating the substance with a high concentration of
                (a) Hydroxide ion – Baking powder 
                (b) Hydrogen ion – Battery acid                                                 (2)

 2.5 Monosaccharide

       2.5.1    Names of the structures
                A – Fructose 
                B – Glucose                                                                     (2)

       2.5.2    Indication of the compound formed from fructose and glucose
                Sucrose                                                                         (1)

       2.5.3    TWO elements that are basic composition of carbohydrates
                 Carbon 
                 Hydrogen 
                 Oxygen                                             (Any 2)                (2)
                                                                                            [35]

Copyright reserved                                                            Please turn over

### Page 5

(EC/NOVEMBER 2020)                    AGRICULTURAL SCIENCES P1                                  5

 QUESTION 3: SOIL SCIENCE

 3.1 Soil texture

       3.1.1    Indication of the sample
                (a) Sample B 
                (b) Sample A 
                (c) Sample B 
                (d) Sample A                                                                  (4)

       3.1.2    Commenting on the pore space of soil sample B by referring to
                bulk density
                Soil sample B has a high bulk density / 3,2 g/cm3 and therefore lower
                pore space                                                                    (2)

 3.2 Soil structure

       3.2.1    Identification of the structure
                A – Platy 
                B – Prism-like/columnar/prismatic 
                C – Crumb/spheroid                                                            (3)

       3.2.2    Indicating the letter representing the structure
                (a) A 
                (b) C                                                                         (2)

       3.2.3    TWO malpractices leading to the destruction of structure
                 Flood irrigation 
                 Cultivation of soil when it is too dry or wet 
                 Ploughing and other tilling methods 
                 Overgrazing / burning / removal of plant material 
                 Movement of animals and equipment over wet soil 
                 Irrigation leading to salt accumulation                      (Any 2)        (2)

 3.3 Soil moisture

       3.3.1    Naming the term
                A – Saturation point 
                B – Field water capacity                                                      (2)

       3.3.2    Reason
                A – Soil is completely filled with water 
                B – Amount of water held in soil after saturation and drainage                (2)

       3.3.3    Plant response grown in soils in Container C and D
                (a) B – Plants will grow optimally 
                (b) C – Plants will wither/die                                                (2)

       3.3.4    Differentiation between temporal and permanent wilting points
                Temporal wilting – The point when plants appear wilted only
                                    during the hottest part of the day and recover 
                Permanent wilting – Plants do not recover from wilting                        (2)

Copyright reserved                                                          Please turn over

### Page 6

6                            AGRICULTURAL SCIENCES P1                        (EC/NOVEMBER 2020)

 3.4 Soil colour

       3.4.1    Differentiation between homogeneous and non-homogeneous
                soil colour
                Homogeneous – Single dominant colour in soil 
                Non-homogeneous – Mixture of soil colours                                      (2)

       3.4.2    TWO factors determining the colour of soil
                 Presence of water 
                 Gleying conditions 
                 Organic material 
                 Presence of oxides 
                 Presence of carbonates                                      (Any 2)          (2)

 3.5 Soil gas

       3.5.1    Indication of the gas deficient in experiment 1
                Oxygen                                                                         (1)

       3.5.2    Role the gas could have played if not deficient
                Influenced seed germination                                                    (1)

       3.5.3    Gas high in soil as a result of activities in experiment 2
                Carbon dioxide                                                                 (1)

       3.5.4    Reason for the high amount of carbon dioxide
                Released during respiration  of plant roots and soil
                micro-organisms                                                                (2)

 3.6 Soil temperature

       3.6.1    Indication of the letter
                (a) A 
                (b) C 
                (c) A                                                                          (3)

       3.6.2    TWO methods to manipulate soil temperature
                 Irrigation 
                 Mulching 
                 Clear plastic covers 
                 Shading                                                      (Any 2)     (2)
                                                                                           [35]

Copyright reserved                                                           Please turn over

### Page 7

(EC/NOVEMBER 2020)                   AGRICULTURAL SCIENCES P1                                   7

 QUESTION 4: Soil science

 4.1 Soil horizons

       4.1.1    Sketching the soil profile

                           A
                           B 
                           C
                           R                                                                   (2)

       4.1.2    Indication of the horizon
                (a) E 
                (b) G                                                                         (2)

       4.1.3    TWO diagnostic horizons of A horizon
                 Humic 
                 Vertic 
                 Melanic 
                 Orthic                                                       (Any 2)        (2)

 4.2 Soil classification

       4.2.1    THREE reasons for classification of soil
                 Optimal utilisation of country’s natural resources 
                 Scientific planning of farm 
                 Determining the crop production potential of the soil 
                 Improved soil science communication 
                 Development of new regions 
                 Valuation of soils                                           (Any 3)        (3)

       4.2.2    System used in South Africa to classify soil
                Binomial system                                                               (1)

Copyright reserved                                                          Please turn over

### Page 8

8                                                          AGRICULTURAL SCIENCES P1                (EC/NOVEMBER 2020)

 4.3 Soil pH

       4.3.1    Line graph

                                                           Effect of soil pH on availability of
                                                                      Molybdenum

                     Availability of Molybdenum (g)
                                                      16
                                                      14
                                                      12
                                                      10
                                                       8
                                                       6
                                                       4
                                                       2
                                                       0
                                                           2        4       6             8   10       12
                                                                                Soil pH

       Criteria/rubric/marking guideline
        Correct heading 
        X-axis: Correctly calibrated and labelled (Soil pH) 
        Y-axis: Correctly calibrated and labelled (Availability of molybdenum) 
        Line graph 
        Accuracy 
        Correct unit (g)                                                                                            (6)

       4.3.2    Deduction of the influence of acidity and alkalinity on the
                availability of molybdenum
                In acid soil/low pH molybdenum is not available 
                In alkaline soil / high pH molybdenum is more available                                              (2)

       4.3.3    Measures to solve problems of:
                (a) Decreased availability of molybdenum in soils with a pH of
                    between 2 and 4
                    Application of basic fertilisers such as lime/CaCO3                                              (1)
                (b) Toxic quantities of molybdenum in soil with pH of 14
                    Application of gypsum/CaSO4                                                                      (1)

 4.4 Soil colloid

       4.4.1    Deduction of the process
                A – Cation adsorption 
                B – Cation exchange                                                                                  (2)

       4.4.2    Reason for cation exchange
                Potassium cation from the soil solution exchanges with the hydrogen
                adsorbed in the colloid                                                                              (1)

Copyright reserved                                                                                 Please turn over

### Page 9

(EC/NOVEMBER 2020)                    AGRICULTURAL SCIENCES P1                                  9

       4.4.3    Indication of the hydrogen cation having an effect on plants
                Hydrogen in the soil solution                                                  (1)

       4.4.4    TWO types of colloids
                Organic colloid
                Inorganic colloid                                                              (2)

       4.4.5    Differentiation between sodic and saline soils with regard to
                dominant salts
                Sodic soil – Sodium carbonates 
                Saline soil – Chlorides and sulphates of sodium, calcium and
                              magnesium                                                        (2)

 4.5 Soil organisms

       4.5.1    Classification of the worms into groups of soil organisms
                Macro-organisms                                                                (1)

       4.5.2    TWO conditions for the survival of worms
                 Organic nutrients 
                 Mineral nutrients (nitrogen/phosphorus/potassium) 
                 Soil moisture close to field water capacity 
                 Soil air for respiration
                 Optimum temperature (temperature between 25 °C and 30 °C 
                 Optimum soil pH                                        (Any 2)               (2)

       4.5.3    Explanation of how worms will assist farmers
                 Break down plant and animal remains  to liberate plant nutrients 
                 Improve soil structure  for increased water retention capacity 
                 Worm casts is rich in organic matter  which improves soil fertility 
                 Maintain CO2 concentration  which is used by plants during
                  photosynthesis                                               (Any 1)         (2)

 4.6 Nutrient cycle

       Nutrient cycle increasing nutrient content in plants
       (a) Protein content – Nitrogen cycle                                                    (1)
       (b) Carbohydrate content – Carbon cycle                                                 (1)
                                                                                               [35]

                                                                  TOTAL SECTION B:             105
                                                                     GRAND TOTAL:              150

Copyright reserved                                                          Please turn over

## Related documents

- [AGRIC SC P2 MEMO GR11 NOV 2020 English](https://www.hlayiso.com/library/agric-sc-p2-memo-gr11-nov-2020-english/c5679e70-255a-4479-8b01-4d70151940ab) — Agricultural Sciences · Memo · 2020 · Eng
- [AGRIC SCIENCES P1 GR11 QP MEMO NOV2020 AFR D](https://www.hlayiso.com/library/agric-sciences-p1-gr11-qp-memo-nov2020-afr-d/10c36ada-93d2-4204-92ee-2ba7816c1eff) — Agricultural Sciences · Memo · 2020 · Afr
- [AGRIC SCIENCES P1 GR11 QP MEMO NOV2020 ENG D](https://www.hlayiso.com/library/agric-sciences-p1-gr11-qp-memo-nov2020-eng-d/264dc1eb-7c35-4f73-91ef-7086aaa88ec6) — Agricultural Sciences · Memo · 2020 · Eng
- [AGRIC SC P2 MEMO GR11 NOV2020 AFR D](https://www.hlayiso.com/library/agric-sc-p2-memo-gr11-nov2020-afr-d/f0474d0c-1f61-497c-bc0f-1c22266c2303) — Agricultural Sciences · Memo · 2020 · Afr
- [AGRIC SC P2 QP MEMO GR11 NOV2020 AFR D](https://www.hlayiso.com/library/agric-sc-p2-qp-memo-gr11-nov2020-afr-d/09159f67-bcfa-4e7a-992c-a85b09160aaf) — Agricultural Sciences · Memo · 2020 · Afr
- [AGRIC SCIENCES P1 GR11 MEMO NOV2020 ENG D](https://www.hlayiso.com/library/agric-sciences-p1-gr11-memo-nov2020-eng-d/ed277de7-e17c-494b-b6d9-b09f4904e8b8) — Agricultural Sciences · Memo · 2020 · Eng

## More from Grade 11 Agricultural Sciences

- [Gr 11 Agric Sci ATP 2023-24](https://www.hlayiso.com/library/gr-11-agric-sci-atp-2023-24/06bad6ac-81c6-4c4f-95ed-6a17594131f0) — ATP
- [AGRICULTURAL SCIENCES P1 GR11 QP NOV2025 English watermark](https://www.hlayiso.com/library/agricultural-sciences-p1-gr11-qp-nov2025-english-watermark/a0d7791e-a982-4fac-bbc7-e165ae1824d4) — QP · 2025 · Eng
- [AGRIC SCIENCES P2 QP GR11 NOV 2025 ENG watermark](https://www.hlayiso.com/library/agric-sciences-p2-qp-gr11-nov-2025-eng-watermark/2bc88d06-6d78-4e49-82e4-f8d8bd1bf767) — QP · 2025 · Eng
- [NW 11 AGRICULTURAL SCIENCES P1 ENG QP NOV 2024](https://www.hlayiso.com/library/nw-11-agricultural-sciences-p1-eng-qp-nov-2024/d22ddfcd-c05f-4498-9502-5499160abf3a) — QP · 2024 · Eng
- [NW 11 AGRICULTURAL SCIENCES P2 QP ENG NOV 2024](https://www.hlayiso.com/library/nw-11-agricultural-sciences-p2-qp-eng-nov-2024/d52e073b-9f61-47c0-884b-07d65f183daa) — QP · 2024 · Eng
- [AGRIC SCIENCES P1 QP GR11 NOV 2023 English](https://www.hlayiso.com/library/agric-sciences-p1-qp-gr11-nov-2023-english/821c2694-4b74-453f-b23b-954c53091012) — QP · 2023 · Eng

## Collection

- [Grade 11 past papers](https://www.hlayiso.com/grade-11/past-papers)

---

Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. When citing, link the page URL above, not a PDF or /api/ URL.