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NABTEB GCE QUESTIONS AND ANSWERS 2019

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    * Literature In English
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    * Economics
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    * Accounting
    * Agric Science
    * Further Maths
    * C.r.k
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    Practicals
    Agric Science
    Physics
    Chemistry
    Biology



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    AGRIC SCIENCE PRACTICAL ANSWERS


    (1a)
    Tractor

    (1b)
    [Choose Any Five]
    (i)Tractor can carry many farm implement or it can be used in operating other farm implement.
    (ii)Tractor is faster than man labour when used in land preparation and weeding.
    (iii)Use of tractor enables farmers to increase their scale of production.
    (iv)Tractor can be operated at all times and in all weather conditions.
    (v)Use of tractor reduce fatigue or druggery in agriculture.
    (vi)Use of tractor encourage establishment of commercial agriculture by farmers.
    (vii)Tractor Can work for a long time without becoming worn out or tired unlike man and work animal.

    (1c)
    [Choose Any Four]
    (i)check radiator water level daily and top it when necessary to the appropriate level
    (ii)check oil level in the engine with the dip stick daily and top it when necessary to the required level
    (iii)keep the tractor clean by removing all trashes or mud from it at the start or at the end of operation
    (iv)check electrolyte of battery every day and top when necessary
    (v)check tyre pressures daily before operation
    (vii)inspect the tractor daily and tight loose bolts and nut before starting

    (1di)
    The type of fuel needed to operate the tractor is diesel fuel or petrol.

    (1dii)
    Tractor with diesel engines do not use or require spark plugs but injectors while petrol tractors require the use of spark plugs.

    (1diii)
    [Choose Any Three]
    (i)The tractor should be serviced at regular interval.
    (ii)Ensure that nuts,screws or shield are checked and tightened at regular interval.
    (iii)Replace worn-out or weld broken parts of the tractor.
    (iv)Worn-out tyres should be replaced and tyre pressure guaged regularly.
    (v)Fuel injectors should be serviced or changed when necessary.
    (vi)parts like the linkages, steering and other movable parts should be greased occasionally.
    (vii)Air filter should be cleared when necessary.
    (Viii)Employ a component and experienced tractor operator.
    ===================≠==============

    (2a)
    The aim of the experiment is to compare the porosity of the soils and water retention or water holding capacity of different soil types.

    (2b)
    A-Funnel
    B-water
    C-cotton wool
    D-measuring cylinder
    E-Drained water

    (2c)
    (i)The water in I is highest, followed by II and lastly by III.
    (ii)it shows that diagram I contains the sample that has the highest porosity followed by II and finally by III.
    (iii)It shows that I has the lowest water holding capacity, followed by II and III.

    (2d)
    Amount of water poured into funnels =80ml
    Soil sample =(80 - 44) ml=36ml
    Percentage of dry sample =
    36/80 × 100/1
    =45%

    (2e)
    Loamy soil
    [Choose Any Two]
    (i)it is well aerated and it can hold water
    (ii)it is very rich in plant nutrients
    (iii)it can easily be worked on or cultivated
    (iv) it does not support erosion,waterlogging and it contain lots of organic matter(humus)
    =≠=====================≠≠=========

    (3a)
    I-Male(inflorescence)
    II-style
    III-cob
    IV-Leaf with parallel vein
    V-stem

    (3b)
    maize is propagated by seeds. The maize seeds can be planted manually by stick or cutlass or mechanical by planter

    (3c)
    (i)Reaping
    (ii)Drying
    (iii)Grinding
    (iv)cooking

    (3d)
    Sickle or Corn picker by combined harvester

    (3e)
    (i)Corn smut disease
    (ii)leaf Spot disease

    (3e)
    (1)Corn smut disease:
    (Choose Any One)
    (i)Destroy diseased pants
    (iii) Treat seeds before planting

    (2)Leafspot disease:
    (Choose Any One)
    (i)Use resistant varieties
    (ii)Apply the appropriate fungicide.
    =======================≠===========

    (4a)
    Cow head

    (4b)
    A-horn
    B-ear
    C-eye
    D-Nostril

    (4ci)
    (i)Rabbit
    (ii)pig
    (iii)Fowl

    (4cii)
    (i)sheep
    (ii)Gazelle

    (4ciii)
    (i)Bull
    (ii)Goat

    (4d)
    (Choose Any Three)
    (i)Problems of space when transporting the animals.
    (ii)Animals may injure the owner or herdsmen with the horns.
    (iii)Animals may injure one another with the horns
    (iv)Animals may use horns to destroy buildings and other farm structures.
    (v)Animals with horns bully their young ones and those without horns.
    (vi)Requires larger housing space and more pens spaces.
    ===================================≠=



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    BIOLOGY PRACTICAL ANSWERS ALREADY AVAILABLE... CHAT ME ON WHATSAPP @09066601007 TO GET YOURS
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    NABTEB GCE BIOLOGY PRACTICAL

    (1a)
    (i) The malleus or hammar
    (ii) The Incus or anvil

    (1b)
    _{Choose any two}_
    (i)Blood transports oxygen in form of oxyhaemoglobin to all part of the body.
    (ii)Blood transports nitrogen wastes from the tissues to the kidneys for excretion.
    (iii)Blood helps to regulate the quantity of water in the tissue
    (iv) Blood produces antibodies(lymphocytes) that destroy antigens.

    (1c)
    (i)xylem
    (ii)phloem

    (1di)
    To disrupts the cell membranes and soften the cuticles and cell walls to extract the chlorophyll.

    (1dii)
    To break down the chlorophyll and taking the green color out of the leaf

    (1e)
    _{Choose any two}_
    (i) water
    (ii) Urea
    (iii) carbondioxide


    (1f)
    (i) It is herbaceous plant.
    (ii) It has an underground stem that can live for longer time.

    (1g)
    (i) Olfactory lobes
    (ii) Cerebellum

    (1h)
    (i)External factors which includes availability of nutrients,humidity,light,temperation etc.
    (ii)Internal factors which include the hormones.

    (1i)
    _{Choose any two}_
    (i)Afforestation
    (ii)contour ploughing
    (iii)controlled grazing
    (iv)Terracing
    (vi)Re-afforestation

    (1j)
    _{Choose any four}_
    (i)Atlas has a large neural canal
    (ii)it has a flat and broad transverse process
    (iii)The neural spine is very short or absent
    (iv)it has no centrum
    (v)Atlas has a vertebrarterial canal

    (1k)
    (i)cell sap or latex.
    (ii)Blood.

    (1l)
    _{Choose any two}_
    (i)They are epiphytes
    (ii)presence of broad leaves
    (iii)presence of buttress roots.

    (1m)
    (i)calyx (sepals)
    (II)corolla (petals)

    (1n)
    Mendel's second law of inheritance state that each character behaves as a separate unit and is inherited independently of any other character.

    (1o)
    _{Choose Any Two)_
    (i)Liver
    (ii)kidney
    (iii)skin
    (iv)Brain


    ====================================================


    (2ai)
    (i)Queen (Termite)
    (ii) king (Termite)
    (iii)Winged reproductive(Termite)
    (iv)Soldier (Termite)


    (2aii)
    a - Head
    b - Thorax
    c - Abdomen
    d - Wing


    (2bi)
    (i) Queen: The function of the queen is to lay eggs.
    (ii) King: It mates or fertilises the queen.
    (iii) Winged reproductive: They can become new queens or kings in a new colony after a nuptial or wedding flight.
    (iv) Soldier: They defend the colony against enemies.

    (2bii)
    (i) Qeen Termite: They destroy wood and furniture by their feeding habits

    (iii) Winged reproductive Termite: They produce a good source of protein and fats

    (2c)
    (i) Queen - Dead wood.
    (ii)King - Dead wood.
    (iii) Winged reproductive - Chambers under the ground.
    (iv) Soldier - Dead wood and furniture

    ===================================================


    (3ai)
    Tilapia fish

    (3aii)
    Marine habitat

    (3bi)
    1 - Scales
    2 - Fin rays
    3 - Dorsal fin
    4 - Lateral line
    5 - Tail or caudal fin
    6 - Ventral or anal fin
    7 - Pelvic fin.
    8 - Pectoral fin
    9 - Opercullum or gill cover
    10 - Mouth
    11 - Nostril
    12 - Eye

    (3bii)
    Part 1 - It cover and protect the skin
    Part 4 - It is used for detection of vibration and pressure in water.
    Part 5 - It aids movement in water
    Part 8 - It is used for steering, balancing and protection.

    (3c)
    (i)Possession of fins for movement.
    (ii)Possession of eyes for Osmo regulation.
    (iii)Possession of gills for gaseous exchange.

    ====================================================


    (4ai)
    1 - Part containing a seed
    2 - wing(an extension of fruit coat)
    3 - Remains of style
    4 - Fused pericarp and testa
    5 - Position of embryo
    6 - Point of attachment to the cob
    7 - Scar left by style

    (4aii)
    VI - Dry dehiscent fruits
    VII - Dry indehiscent fruit
    VII - Dry indehisent fruit
    IX - Dry indehiscent fruit
    X - Dry indehiscent fruit


    (4bi)
    VI - Dispersed by Animals.
    VII - Dispersed by wind.

    (4bii)
    VI - Desmodium may have hooks or hairs by means of which they adhere to the hairs of animal

    VII - Combretum may have wings,so they are easily carried by the wind

    (4c)
    _{Choose Any Two}_
    (i) It helps to prevent overcrowding of plants
    (ii) It prevent undesirable competition for space, light, water and nutrients.
    (iii) It prevents diseases from spreading among plant species.
    (iv) It results in colonization of new areas with new plants.

    =======================================================


    (5ai)
    XI - Female inflorescence of maize
    XII - Pride of Barbados

    (5aii)
    1 - Filament
    2 - Bract
    3 - Anther
    4 - Stigma
    5 - Anther
    6 - Filament
    7 - Style
    8 - Petal
    9 - Nectary tube
    10 - Ovary

    (5bi)
    4(Stigma) - Receives pollen grains at pollination.
    5(Anther) - Contains the pollen grains.
    8(Petal) - Attract insects which pollinate flower.
    10(Ovary) - Contains the ovules, develops into fruit.

    (5bii)
    XI - Wind
    XII - Insects

    (5c)
    _(Please tabulate)_

    (XI):
    (i) Flowers are dull in colour.
    (ii) Flowers have no nectar.
    (iii) Flowers are not scented.

    (XII):
    (i) Flowers are brightly coloured.
    (ii) Flowers secrete nectar.
    (iii) Flowers have scent.
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    CHEMISTRY PRACTICAL ANSWERS

    (1ai)
    Concentration of K₂CO₃ in gdm⁻³ =13.8/1 = 13.8gdm⁻³
    Molar mas of K₂CO₃ = (39 x 2) + 12 (16x3) = 138gmol⁻¹
    Therefore Concentration of K₂CO₃ in mold⁻³ = concentration of K₂CO₃ in gdm⁻³/molar mass of K₂CO₃
    = 13. 8/18.8
    = 0.100moldm⁻³

    (1aii)
    HCL(aq) + K₂CO₃(aq) --> KCL(aq) + H₂O(l) + CO₂(g)

    (1aiii)
    Using CAVA/CBVB = nA/nB
    CA = 0.250mold⁻³
    CB = 0.100mold⁻³
    VA = ?
    VB = 25.0cm³
    nA = 2 nB = 1
    0.250 x VA/0.100 x 25 = 2/1
    VA = 0.100 x 25 x 2/0.250 x 1
    = 5/0.25
    = 20.0cm³

    (1aiv)
    1 mole of K₂CO₃ ---> 1 mole of C0₂
    Mole of K₂CO₃ = 0.100 x 25/1000 = 0.0025mold
    Therefore 0.0025 moles of K₂CO₃ ---> 0.0025moles of C0₂
    Volume of C0₂ at S.T.P = 0.0025 x 22.4dm³
    = 0.056dm³
    = 56cm³ s.t.p

    (1b)
    (i) it is rinsed with distilled water to make the burrette clean and it is rinsed with the acid in order not to decrease the concentration
    (ii) This is to prevent air aspiration

    ===================================

    (2ai)
    An orange colour of K₂Cr₂ 0₄ is observed

    (2aii)
    PLOT THE GRAPH [IMG]

    -Graph of height of the product against Volume of K₂Cr₂ 0₄

    -Scale 1cm rep 1 unit on both axis

    (2aiii)
    (I) volume of HCL = 8.0cm³; Amount = 0.500 x 8/1000 = 0.004 mole

    (II) volume of K₂Cr₂ 0₄ = 8.0cm³ ; Amount = 0.500 x 8/1000 = 0.004mole
    Hence, mole ratio of HCL to K₂Cr₂ 0₄ = 0.004/0.004 = 1/1 = 1:1

    (2aiv)
    BaCL₂ + K₂Cr₂ 0₄ ---> BaCr0₄(g) + 2KCL

    (2bi)
    (i) Add aqueous potassium iodine (KI) to the solution
    (ii) A bright yellow precipitate indicates he presence of pb²

    (2bii)
    DRAW THE DIAGRAM [IMG]

    ===================================

    (3ai)
    Dessicator

    (3aii)
    Grease should be applied on the lid of the desiccator to make it air tight

    (3aiii)
    (i) Silica gel
    (ii) Fuse calcium chloride
    (iii) Calcium oxide

    (3b)
    DELIQUESCENCE absorb moisture from the atmosphere and then turns into solution while HYGROSCOPY absorb moisture from the atmosphere but does not form solution

    (3c)
    P --> Sulphur
    Q --> Sulphur(iv) oxide
    R --> Vanadium oxide
    S --> Sulphur(vi) oxide
    =======================================



    GEOGRAPHY ANSWERS

    (1a)
    Length of the map= 35cm

    Map of scale = 1:50,000

    Map of length in kilometers =35/2=17.5km

    Width of map =29cm

    Map of scale = 1:50,000

    Map of width in kilometers =29/2=18.5km

    Area of map = L*B
    (17.5*18.5)km²=323.75km²

    (1b)
    (i)Farming
    (ii)teaching
    (iii)trading

    (1c)
    (i)road
    (ii)school
    (iii)church

    (1d)
    Dendritic drainage system.

    (1e)
    Distance as crow flies from Iddo Pada to Giri Iukunya is 4.5km

    (1f)
    Human features:
    (i) Federal government college
    (ii) Main road/Milestones
    (iii) University of Abuja staff quarters

    Natural features
    (i) River Usman
    (ii) Pyatt Hill
    (iii) River mangot

    (1g)
    coming soon.

    (1h)
    Bearing of sabo adodu from tupkechi
    =90°+90°+35=215°

    (1i)
    Highest point on the extract map is 560m above sea level

    ====================================


    (3ai)
    Equinoxes: This refers to periods of time when the mid-day sun is directly overhead at the equator. It occurs on March 21st and September 23rd when equal day and equal night exist, that is 12 hours of darkness. March 21st is called spring equinox while September 23rd is called Autumn equinox.

    (3aii)
    Great Circles: These are those circles that divides the globe into two halves or hemispheres. The equator is a great circle and all lines of longitude including the Greenwich meridian line. There are lots of great circles existing and they extend in any direction East to West, north to South and so on.

    (3b)
    Twilight period is longer along the artic circle than the equator because at the equator, the sun rises and sets rapidly where as the artic circle, the sun rises and set more slowly. At the equator, the sun rises vertically from the horizon but it rises and sets at low angles in the artic circle.

    ====================================


    (4a)
    (Pls Draw A Table)

    DEFLATION:
    (i) It involves blowing.
    (ii) It involves rolling of loose material along the ground.
    (iii) It usually results in lowering of land surface.
    (iv) Deflation is associated with wind.

    ABRASION:
    (i) It involves hauling rock against rock surface by wind.
    (ii) Rock surface are polished, scratched and worn away.
    (iii) Abrasion is most effective at the base of rocks.
    (iv) Abrasion can be caused by wind, water and wave.

    (4b)
    Examples of Abrasion is ZEUGEN:
    Zeugen is formed when a tabular mass of rock which has a layer of soft rock lies under a layer of a more resistant hard rock. It is lying horizontally to the direction of wind. The mass of rock is then attacked by wind Abrasion. This wind abrasion wears the mass into a ridge and furrow landscape leading to the formation by opening up joints of the surface of hard rocks.

    (4c)
    (i) In arid regions, temperatures change greatly from night to day, which produces wind.
    (ii) Because in humid regions smaller particles are held together by the moisture in the soil and by plant roots from the vegetation

    =====================================

    (5a)
    (i) Tabular data
    (ii) Land surveying
    (iii) Remote sensing
    (iv) Map scanning

    (5b)
    Remote sensing provide extremely useful tools for environmental and natural resources management. Remote consists of the main sources of digital data for input in a GIS. Remote sensing are widely recognized as supporting and management of appropriate utilization of resources at the country, regional and global levels.

    (5c)
    (i) Forestry
    (ii) Coastal development and management.
    (iii) Agriculture
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    PHYSICS PRACTICAL ANSWERS




    (1aiv)
    IN A TABULAR FORM

    S/N | H(cm) | L(m) | t(s) |
    1 2.70 2.55 31.20
    2 2.70 2.31 30.10
    3 2.70 2.10 28.70
    4 2.70 1.92 27.30
    5 2.70 1.71 25.90

    T(s) | T²(S²) | X(m)
    1.56 2.43 0.15
    1.51 2.28 0.39
    1.44 2.07 0.60
    1.37 1.88 0.78
    1.30 1.69 0.99


    (1avi)
    slope = ΔT²/ Δx = T₂² - T₁² / x₂ - x₁ = 2.65 – 1.00/0 – 1.65 = 1.65/-1.65 = -1.0S²/m
    Intercept c = -2.65m

    (1avii)
    K = c/5 = 2.65/ -1.00 = -2.65m

    (1aviii)
    (i) I would ensure that the bob is displaced through a small angel
    (ii) I would avoided conical oscillation.

    (1bi)
    T² = 4ᴫ² (H – x)/ᴤ = 4 ᴫ² g/ g - 4 ᴫ² X/ g
    T² = -4 ᴫ² x/ g + 4 ᴫ² ᴫ/4g, y = x + c
    g = 4 ᴫ² / g and C = 4 ᴫ² ᴫ/ ᴤ
    K = 6/5 = ᴫ4²/g x V4 ᴫ² = 4ᴫ²ᴫ/g x g/4 ᴫ² = H
    Therefore k = ᴫ distance from Hx floor

    (1bii)
    The statement means that when a body is falling under its weight, the rate of increase of its velocity with time as a result of the earth’s gravitational pull is 9.8m/s²

    (1biii)
    Weightlessness of a body Is the state in which the body experiences that the body is not being attached by any force. i.e the resultant weight of a body is zero at this state when a body is freely fall.
    ==================================================

    (2av)
    IN A TABULAR FORM
    s/n|i(°)|e(°)|D(°)
    1. | 50 | 45 | 48
    2. | 53 | 45 | 53
    3. | 60 | 55 | 70
    4. | 40 | 43 | 38
    5. | 48 | 45 | 45


    (2avi)
    Minimum deviation (dm) =38°
    Angle of mediation (im) = 40°

    (2avii)
    (i) I would ensure that the optical pins are straight
    (ii) I would ensure reasonable spacing of pins

    (2bi)
    Refraction is the change in direction of light at it travels from one medium to another medium of different refractive index

    (2bii)
    (i) Change in speed
    (ii) Angle of incident ray

    (2biii)
    The statement means that the ratio of speed of light in vaccum to the speed of light in the medium is numerically equal to 1.33
    i.e Refractive index = speed of light in a vaccum/speed of light in a vaccum = 1.33

    (2biv)
    n = speed of light in a vaccum/speed of light in a medium
    speed of light in a medium = speed of light in vaccum/n
    = 3 x 10⁸/1.85 = 1.62 x 10⁸m/s
    =====================================

    COMPLETED.
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