2012 NECO REAL PHYSICS, CHEMISTRY, BIOLOGY, AGRIC SCIENCE PRACTICAL QUESTIONS AND ANSWERS

[MR. BRAIN]

FIRST AND FOREMOST, WE WILL START BY POSTING THE AGRICULTURAL SCIENCE, PHYSICS, CHEMISTRY AND BIOLOGY SPECIMENs

2012 NECO AGRICULTURE SCIENCE SPECIMEN

• A - GO TO heLL
  
• B - HOE
  
• C - EGG TRAY
  
• D - feeding trough
• E - Wood shavings
  
• F - arrow/pins
  
• G - snail
  
• H - termite
  
• I - earthworm
  
• J - NPK fertilizer
  
• K - poultry droppings
  

(Xbrainsforum.tk)

• L - lime (calcium carbonate CaC0)
  
• M - tomatoes frult
• N - citrus frult
  
• O - Cassava tuber
  
• P - onion
  
• Q - milk (evaporated)
  
• R - egg
  
• S - animal skin.
  

 


2012 NECO BIOLOGY SPECIMEN

• A - rat
  
• B - earthworm
• C - spider
  
• D - snail
  
• E - weevil
  
• F - margarine
• G - glucose solution
• H - sucrose   or maltose solution

(Xbrainsforum.tk)

• I - egg albumen
  
• J - molar tooth
  
• K - incissors
  
• L - canine
  
• M - dry pod of pride of barbados
• N - guava frult
  
• O - orange frult
  
• P - mango frult
  
• Q - dry okro frult
  
• R - benedict solution
• S - iodine solution
  
• T - millon's solution
  
• U - Dilute HCL

2012 NECO PHYSICS SPECIMEN
:

A  --- GENERAL APPARATUS:
*Mathematical table/calculators

.
*Graph paper.
*Geometrical instrument

B --- SPECIFIC APPARATUS
:

Question One
*Metre rule.

*Knife edge
.
*About 1.5m length of thread
50g mass covered and labeled M.
*Masses of 10, 20, 30 and 40g.

Question Two
*500cm3 Measuring cylinder.
*Water.
*Two optical pins
*Two split corks.
*Retort stand with clamp and boss.
*Metre rule.

Qestion Three
*2V accumulator OR 2 x 1.5V dry Leclanch' cell.
*Plug key.
*Five connecting wires.
*Ammeter ( 0 - 3A  or 0 - 5A)[/color]

Xbrainsforum.tk

2012 NECO CHEMISTRY PRACTICAL SPECIMEN


LOADING.....

NOW LET GO.....

[megax]

NECO  BIOLOGY & AGRIC SPECIMEN, PROBABALE QUESTION AND ANSWER

BIOLOGY

A - Rat B - Earthworm C - Spider
D -Snail E - Weevil F - Margarine G - Glucose solution
H - Sucrose or Maltose solution I - Egg albumen
J - Molar tooth K - Incissors L - Canine
M - Dry pod of pride of barbados N - Guava fruit
O - Orange fruit P - Mango fruit Q - Dry okrofruit
SOLUTIONS: R - Benedict solution. S - Iodine solution
T - Millon's solution U - Dilute HCl

Kingdom, Phylum and Class of Specimen ABCDE

A-Animalia, Vertebrate, Mammalia.
B-Animalia, Annelida, Oligochaeta
C-Animalia, Arthropoda, Oligochaeta
D-Animalia, Mollusca, Gasctropoda
E-Animalia, Arthropoda, Insecta


Features of Specimen ABCDE

A(RAT):
1.   Body covers with hair/fur
2.   Has a pair of pinna(external ear)
3.   Has two pairs of pentadactyl limbs
4.   Has long furless, scaly tail

B(Earthworm):
1.   It  is segmented
2.   Has chitallium
3.   Has cheata/setae
4.   Has two openings i.e mouth and anus
5.   Has moist skin

C(spider):
1.   Body is divided into two i.e cephalothorax
2.   Has four pairs of leg
3.   Has a pair of chelicerae

D(snail):
1.   Body covered with shell
2.   Has a pair of upper and a pair of lower tentacle
3.   Has foots
4.   Has anus
5.   Has genital pore

E(Weevil):
1.   Body divided into three i.e head thorax, abdomen.
2.   Has 3 pairs of walking legs
3.   Has a pair of antenna
4.   Has compound eye

DIFFERENCES BETWEEN C AND E
C(SPIDER): 1. Body divided into two i.e cephalothorax and abdomen. 2. Has four pairs of legs. 3. No antenna
E(weevil): 1. Body divided into 3 i.e Head, thorax and abdomen. 2. Has 3 pais of leg. 3. Has a pair of antenna.
Economic importance  of specimen ABCDE
A(rat): 1. Pest of crops. 2.source of human protein. 3.vector of disease (fever)
B(Earthworm): 1. Enrich the soil. 2. Form soil cast. 3. Serves as food for fish, bird, etc.
C(Spider): 1. Vector of disease. 2. Biological control of insect.3.  destroys hmes material
D(snail): 1. Vector of disease. 2. Source of animal protein. 3. Shell used in dye making
E(weevil): 1. Pest of crops. 2. Food for birds.

TEST FOR CARBOHYDRATE:

1.   Solution G+ solution R+ Heat then allow to cool (Reducing sugar tes). Observation: Red/Orange precipitate. Observation: glucose is present.
2.   SOLUTION G+ 3 drops of S. Blue/Black colur Precipitate. Observation: reducing sugar is present.
3.   SOLUTION H+ drops of u + solution R+ heat then allow to cool (test for non-reducing sugar). Observation: Brick red colour. Conclusion: reducing  sugar is present.

TEST FOR FATS AND OIL:

1.   Small amount of F + filte paper (paper marked test). Observation: transluscent spot.  Conclusion: oil or fat is present.

TEST FOR PROTEIN:

1.   Millon?s test: solution I+  solution I + heat: observation: brick red colour. Conclusion: protein is present.
FUNCTION OF SPECIMEN J: For crushing and breaking food/grinding
FUNCTION OF SPECIMEN  k: for cutting food
FUNCTION OF SPECIMEN l: for cutting and tearing of food

FEATURES OF SPECIMEN J K L

j:   cusped, has oneroot
L:  1.long, strong, curve and sharp pointed, 2. Has one root.
K:  1. Rectangular, flat, chisel-like,, 2. Has one root.

EXAMPLES OF ANIMALS WHRE SPECIME JKL CAN BE OBTAINED

FEATURES OF M N O P Q
FRUIT GROUP, NATURE, NO OF SEED, PLACENTATION

1.   M:Legume, simple, Dry Dehiscent, many, pariental
2.   N:Berry, simple, succulent, many, pariental,
3.   O:Berry, simple, succulent, axile.
4.   P:  drupe, simple,succulent,one, basal
5.   Q: capsule, simple, dry dehiscent, many, central

DIFFERENCES BETWEEN O AND P

O: many seeds present, fused pericarp, edible endocarp
P(mango fruit): only one seed present, separate pericarp, endocarp not edible.
CLASSES OF FOOD OF A D I N O P Q
A: protein:  repairs wornout tissues, produce enzymes
D, I,: protein repairs wornout tissues, produce enzymes
N,O,P,Q: vitamins: protects body against disease.

DRAWINGS: LEARN HOW TO LABEL AND DRAW
1.   Rat-terrestial habitat
2.   Earthworm-moist soil
3.   Snail-terrestial habitat
4.   Spider
5.   Weevil
6.   Mango(longitudinal section)
7.   Orange(transverse section).



AGRRICULTURE:


AGRIC SPECIMEN:A - Go To HellB - Hoe C - Egg tray
D - Feeding trough E - Wood shavings F - Arrow/pins
G - Snail H - TermiteI - Earthworm J - NPK fertilizer
K - Poultry droppings L - Lime (Calcium carbonate)
M - Tomatoes fruitN - Citrus fruitO - Cassava tuber
P - OnionQ - Milk(Evaporated) R - EggS - Animal skin.


USES OF SPECIMEN A, B, C, D, E AND F.

A:  1. It is used for harvesting some crops like orange, cocoa, oil palm, kolanut e.t.c. 2. It is used for light pruning.
B: 1. For harvesting some crops. 2. For making ridges and heaps.
C:  1. For collection of eggs. 2. For arrangement of eggs in batches in the incubator.
D:  1.  For feeding birds. 2. For storing livestocks feeds.
E: 1. For flowing brooder.  2.  For collecgting poultry.
F: 1. it is used for making stations. 2. It is  used during chaining for mark off chain length as measured.

GENERAL  MAINTENANCE OF SPECCIMEN A,B,C, D AND F.

i.   All instruments must be cleaned after use.
ii.   Keep instruments in good and dry place.
iii.   Keep them away from rain and heat (sun).
iv.   The metal parts should be oiled or greased.

Characteristics of Specimen G,H and I

Specimen G
i.   They reproduce sexually.
ii.   Possession of calcerous shells secreted by  the mantle for protection, damage and the predators.

Specimen H
i.   Possession of segmented body.
ii.   Possession of jointed limbs or legs for movement

Specimen I
i.   Long segmented body is present.

CULTURAL PRACTICES OF SPECIMEN M,N AND O:

M: 1. Weeding. 2. Watering. 3. Staking
N: 1. Pest and diseases control. 2. Fertilizer application. 3. Weeding.
O: 1. Harvesting. 2. Weeding. 3.fertilizer application.
Pest of M:  1. Cricket.2. birds
Disease of M: 1. Eusarium wilt. 2. Leaf Spot.
Symptom: gradual  dropping of leaves followed by witting and drying up of the whole plants.
Control:  1. Treat with copper fungicides 2. Practice crop rotation.
Pest of Specimen N:  1. Aphids. 2. Scale insects..  Control: spray with insecticides e.g  gamalin 4o.
Symptom of tristeza(viral):  1. Phloem swelling at bud union.
Control: use resistant varieties.
Symptom :  1. scab i.e citirus scab(fungal disease) . 2. Yellowish of leaves plant especially at nursery stage.
Control: treat with fungicide e.g Bordeaux mixture.
Pest of Specimen O:    1.Rodents 2. Grasshoppers, Control:  1. Trapping 2. Shooting with gun. 
Disease of Specimen O:
1. Cassava mosaic.  Symptoms: 1. Vein  clearing. 2. Stunted growth.. Control:  grow resistant varieties.
2.   Bacterial blight: symptom:  water soaked at area of coloured leaves tissues. Control: use clean and disease free stem cuttings.
 
ANIMALS FROM WHICH SPECIMEN Q, R AND S CAN BE DERIVED:

Q:  1. From female cattle (cow). 2. From female sheep(ewe)
R: 1. Female fowl(hen). 2. Female guinea fowl.
S: 1. From skin of cattle. 2. From skin of sheep.

ECOMONOMIC IMPORTANCE OF SPECIMEN Q, R, AND S:
Q:  1. Source of protein in food. 2. It supplies  mineral to livestock. 3. It can be used to raise foster calves, lambs or children. 4. It is used as extender in an artificial insemination.
R: 1. It is used in cosmetics industries. 2. It is used for reproduction. 3. It is used in production of adhesives. 4. It is a source of protein in human diet or food.
S:  1. It is used in clothing materials e.g jacket. 2. It can be processed into meat e.g pormon(skin) . 3. It can be processed into leather for the manufacture of bags, shoes, ropes, foot wears, e.t.c.

QUESTION: With the aid of anointed diagrams show the external features of both specimen G and I(snail and earthworm respectively.

ANSWER:  1. Draw snail showing shell, collar, eyes, tentacles, muscular foot. 2. Draw earthworm showing mouth, chetae, male opening, female opening, clitellium, anus, body segments

IMPORTANCE OF SPECIMEN G, H and I in agriculture:  1. They help to decompose  organic materials in the soil to form humus. 2. They improve soil water percolation. 3. They improve soil structure.

ADVANTAGES OF SPECIMEN J, K and L:  1
J:  1: it helps to improve yield of crops. 2. It improves the structure of the soil. 3. It increases the fertility of the soil. 4. It increases the growth of planktons in the fish-ponds.
K:  1. As organic manure, it usually Improves aeration of the soil. 2. It improves the water holding capacity of the soil. 3. It reduces soil temperature fluctuations. 4. It also improves activities of soil micro organisms in the soil.
L: 1. It reduces soil acidity 2. It improves soil structure. 3. Lime increase the rate of water percolation in the in the clay soil.

PROPAGATION METHODS OF SPECIMEN M,N,O and P:
M- sexual(seeds).
N-both sexual and asexual propagation.
D-  asexual (stem cutting).
P- asexual .

[Walexcy]

Ans 4 physics practical.

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[MR. BRAIN]

PHYSICS PRACTICAL SOLUTION:

1. Suspend a meter rule horizontally on the knife edge supplied. Adjust the meter rule carefully until it settler horizontally.
Repeat and record the point of balance G of the meter rule.
Keep the knife edge at the point G throughout the experiment.
Suspend the object labelled Q at the 20cm mark of the meter rule.
On the other side of G, suspend the mass M= 10g and adjust its position until the meter rule settler horizontally.
Read off the position R of the mass M on the meter rule.
Record the distance y between G and R. Also, record the value of M.
Repeat the  procedure keeping the knife edge at G and the object Q at the 20cm mark but using the masses M, 10,20,30 and 40g On the other side of G. In each case, record the distance y and corresponding value of M.
Determine the value of 1/y and tabulate your readings.
Plot a graph of m against 1/y. Determine the the slope of the graph. Evaluate s/x.
State two Precautions.
Explain what is meant by the center of gravity of a body.
State how this is related to the stability of the body.

SOLUTION:
TABLE:
------------------------------------------
S/N|M(g)|y(cm)|1/y(cm^-1)
1.   |10.00   |56.40 |0.0189
2.   |20.00   |52.68 |0.019
3.   |30.00   |35.12 |0.028
4.   |40.00   |26.34 |0.038
5.   |50.00   |21.07 |0.047
-----------------------------------------
PRECAUTIONS:
1. I ensured the reading was taking when my meter rule is balanced.
2. I avoided Parallex error.

Bi) The center of gravity of a body is the point at which the resultant weight of the body appears to act.

QUESTION 2.
Using the diagram as a guide, carry out the following instructions.
(i) Place the pin,O, horizontally inside the cylinder provided.
Pour some water on the pin in the cylinder such that the length of the water column, l = SO = 10.0cm. Where S represent the water meniscus.
(ii) Insert another pin P in the cork help by the boss of the retort stand.
(iii) Adjust the position of P vertically upward or O formed by refraction at S.
(iv) Read and Record the distance h = PO.
(v) Repeat the procedure for four other values of I = 15, 20, 25 and 30cm.
(vi) In each case, measure and record the corresponding value of h. Tabulate your readings (vii). Plot a graph of h on the vertical axis against I on the horizontal axis.
(viii)Determine the slope S of the graph.
 (ix) Evaluate (a)K1= I-S (b) K2=1/k
(x) State two precautions taken to ensure accurate result.

(Bi) Explain total Internal reflection of light.
(ii) A rectangular glass prism of thickness 6cm and refractive index 1.5 is placed on the page of a book. The prints on the book are viewed vertically downwards from above.
Determine the apparent upward displacement of this prints.

SOLUTION:
TABLE OF VALUES:
S/N| Icm^3| h(cm3)
 1.    |  10.00   |  7.50
 2.    |  15.00   |  11.25
 3.    |   20.00  |  15.00
 4.    |   25.00  |  18.75
 5.    |   30.00  |  22.50

(x) PRECAUTIONS
1. The lower level of meniscus of water is read at eye level.
2. I avoided error due to parallex.
3. Zero error of meter rule is noted.

(Bi) Total internal reflection occurs when light travel from a dense medium to a less dense medium such that angle of incidence is greater than critical angle.
(ii) Let the apparent upward displacement of points b t, real depth, D = 6cm. Therefore apparent depth = D - t = 6 - t
Refractive index a?g = 1.5 = Realdepth/Apparent depth.
1.5=6/6-t
(6-t)1.5=6cm
9-1.5t=6
-1.5t=6-9
 t=6 - 9/2.0cm
R.I = R.D/A.D
.A.D = R.D/R.I = 6/1.5 = 4cm.
Displacement = Realdepth -
Apparent depth = 6-4=2.0cm



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QUESTION NO 3(ELECTRICITY) is for my Direct Mobile Candidates, to belong, visit XBRAINS 2012 NECO RUNS (EXPO) - REAL QUESTIONS AND ANSWERS
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