GRADE 11
AGRICULTURAL SCIENCES
31 AUGUST COMMON TEST 2 2016
19 MARCH 2012
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INSTRUCTIONS AND INFORMATION
1. Answer ALL questions from SECTION A and B
2. Section A and Section B must be answered in the ANSWER BOOK.
3. Start each question from SECTION B on a new page.
4. Study the questions carefully and make sure you answer what is asked.
5. Number your answers correctly.
6. Work neatly.
MARKS: 100 TIME: 1½ Hour
This question paper consists of 06 pages.
1
AGRSGR11ACTP1 [Year]
SECTION A
QUESTION 1
1.1 Four possible answers are given to each of the following statements or descriptions.
Choose the most correct answer and write only the symbol next to The appropriate
question number e.g. 1.1.11 D
1.1.1 Nutrients are more easily taken up from which portion of the root?
A The upper part, next to the ground
B The middle part
C The elongation zone
D The root cap
1.1.2 If a cost of a ton of urea (46% N) is R552.00, then its unit price will be …
A R9
B R 0.55
C R 1,80
D R 12
1.1.3 Which of the following is considered to be immobile within the plant, meaning
that nutrient cannot move from the lower to upper leaves?
A Phosphorus
B Nitrogen
C Calcium
D Molybdenum
1.1.4 Plants can only directly use nutrients that are in the soil solution, but
exchangeable nutrients are used to estimate plant availability. Why?
A It’s easier to measure exchangeable nutrients than soluble nutrients.
B It’s cheaper to measure exchangeable nutrients than soluble nutrients.
C The root prefers exchangeable over soluble nutrients.
D They are only weakly bonded and can easily leave the surface as
solution concentrations decrease.
1.1.5 Plants absorb mineral in the form of …
A Anions
B auxins
C atoms
D ions
AGRSGR11ACTP1 [Year]
1.1.6 The process of conversion of nitrogen from an organic form to an inorganic
form is called …
A nitrification
B mineralisation
C assimilation
D immobilisation
1.1.7 The concentric rings of the xylem which are used to estimate the age of a
tree are known as …
A tree rings
B trunk rings
C tree heart rings
D trunk middle rings
1.1.8 Nutrients from the soil are actively absorbed by crops by means of …
A osmosis
B transpiration pull
C a carrier molecule
D diffusion
1.1.9 Which one of the following is incorrect with regard to the uses of gypsum?
A Improve crop quality
B Helps to reclaim sodic soils
C Decrease the effect of toxic sodium chloride salinity
D Replenish lost nitrogen at planting time
1.1.10 Which one of the following fertilisers cannot be used for foliar sprays?
A Urea
B Ammonium sulphate
C Potassium nitrate
D Limestone ammonium nitrate (LAN)
(10 x 1 = 10)
AGRSGR11ACTP1 [Year]
1.2 In the table below, a statement and two answers are given. Decide whether the
statement in COLUMN B relates to ONE, BOTH or NONE of the items in COLUMN A,
and write A Only, B Only, A and B or None next to the appropriate question number.
e.g. 1.1.6 None
COLUMN A COLUMN B
1.2.1 A Light phase Light independent phase of photosynthesis
B Dark phase
1.2.2 A Temperature A factor that affect the rate of photosynthesis
B Water
1.2.3 A Osmotic flow Process that enable the water to move up a
B Root pressure plant from the roots to the stems and leaves
1.2.4 A Organic Fertilisers consisting of decomposed organic
B Inorganic matter
1.2.5 A LAN Is needed to flocculate clays in soil
B Rock phosphate
(5 x 2 = 10)
1.3 Supply the correct term or concept for each of the following statements. Write your
correct answer next to the appropriate question number.
1.3.1 A green pigment in plants which is able to absorb radiant energy or sunlight
1.3.2 Elements which occur in the soil in small quantities and plants use minute
quantities of them
1.3.3 Organism capable of manufacturing own food
1..3.4 Application of fertilisers in bands or strips on one or both sides of the rows in a
cropping land
1.3.5 A pressure developed against a cell wall due to an increase in water volume
(5 x 1 = 5)
1.4 Change the underlined word/term to correct the statements given below. Write the
correct answer next to the question number (1.4.1 - 1.4.5) in your answer book.
1.4.1 Organic fertilisers have been blamed for environmental damage, including
poisoning of birds and animals
1.4.2 The deficiency disease of molybdenum is known as little leaf disease in fruit
trees and dwarfing of maize plants
1.4.3 The phloem is the transport system of water in plants
1.4.4 Photosynthesis is a catabolic process
1.4.5 A green pigment in plants is located in plant cell structures called leucoplasts
(5 x 1 =5) [30]
AGRSGR11ACTP1 [Year]
SECTION B
QUESTION 2
2.1 Study the illustration below and answer the questions that follow.
2.1.1 Define the process illustrated above. (3)
2.1.2 Identify parts labelled A, B and C. (3)
2.1.3 Explain three reasons why this process is so important for all life on earth. (3)
2.1.4 Briefly discuss how the following factors influence the rate of photosynthesis:
(a) water (2)
(b) temperature (2)
(c) light intensity (2)
2.2 Study the illustration below and answer the questions that follow.
2.2.1 Name the cells which make up the root hair (1)
AGRSGR11ACTP1 [Year]
2.2.2 Mention THREE features of the epidermis of the root hair that make it suitable
for water absorption. (3)
2.2.3 Briefly describe how active absorption of nutrients occurs in plants. (3)
2.3 Mention TWO factors that affect the availability of nutrients to plants. (2)
2.4 Briefly explain why it is important for farmers to conduct nutrient analysis in crop
production. (3)
2.5 Fertiliser application rates in Africa are the lowest in the world and show little increase
over the past two decades. In the sub-Sahara Africa, the situation is of particular
concern as average fertiliser nutrient application rate is at about 10 kg per hectare
compared to south Africa’s 100 kg per hectare and most of the world countries. Use
the information on the bag of multi-nutrient fertiliser below to answer the questions
that follow:
2.5.1 Describe what the numbers 3;2:1(25) stand for, as seen on the multi-nutrient
fertiliser bag. (4)
2.5.2 The numbers on the bag supply important information on plant nutrients.
Calculate the percentage of phosphorus in this multi-nutrient fertiliser mixture. (2)
2.5.3 If a farmer wants to apply 10 kg of phosphorus, how many kilograms of this
multi-nutrient fertiliser mixture should s/he apply? (2)
[35]
AGRSGR11ACTP1 [Year]
QUESTION 3
3.1 In South Africa nitrogen recommendations are currently generally based upon the
target yields. The data in the table below is widely used by agronomists as the basis
of nitrogen fertilisation of maize as recommended to farmers.
Yield target in Recommended
tons/ha nitrogen application
in kg/ha
2 20
3 45
4 70
5 95
6 120
7 145
8 170
9 195
10 220
3.1.1 Draw a bar graph using data above to show the relationship between the
recommended nitrogen to target yields (6)
3.1.2 List TWO forms in which nitrogen is absorbed from soil by a maize plant (2)
3.1.3 Name THREE uses of urea as a straight nitrogen fertiliser (3)
3.2 Study the fertiliser pictures below and answer the questions that follow
3.2.1 Provide chemical compositions of each fertiliser, which are commonly used (4)
by crop farmers in South Africa from the pictures above.
3.2.2 Outline briefly how a farmer would know if he has to apply agricultural lime to (4)
the cropping field.
AGRSGR11ACTP1 [Year]
3.2.3 Describe THREE disadvantages of over-liming the field. (3)
3.3 Distinguish between the following
3.3.1 broadcasting and foliar application (4)
3.3.2 top dressing and side dressing (4)
3.4 Outline any TWO effects of water on fertilisers in the soil. (2)
3.5 Mention THREE disadvantages of kraal manure as a fertiliser (3)
[35]
