*WAEC 2020 PRACTICAL SPECIMEN FOR PHYSICS, CHEMISTRY, BIOLOGY, AGRIC, ANIMAL HUSBANDRY PRACTICALS*
Retort stand and clamp;
Ray box with illuminated object(cross wire);
Convex lens(f = 15cm)
Dry cells(1 pair = 2×1.5v);
Ammeter(0 – 3A);
Resistor P = 1ohms(value concealed);
Seven connecting wires.
+In addition to the fittings and reagents normally contained in a chemistry laboratory, the following apparatus and materials will be required by each candidate:
(a) One burette of 50cm³ capacity;
(b) One pipette, either 20cm³ or 25cm³. All candidates at one centre must use pipettes of the same volume. These should be clean and free from grease.
(c) The usual apparatus for Titration;
(d) The usual apparatus and reagents for qualitative work including the following with all reagents appropriately labelled.
(i) Red and blue litmus paper,
(ii) aqueous ammonia,
(iii) dilute hydrochloric acid,
(iv) dilute sodium hydroxide solution,
(v) barium chloride solution,
(vi) dilute trioxonitrate(v) acid,
(vii) silver trioxonitrate(v)solution,
(viii) Lime water
(e) glass rod;
(f) filtration apparatus,
(h) two boiling tubes,
(i) four test tubes,
(j) wash bottle containing distilled/deionized water,
(k) mathematical table/calculator.
+Each candidate should be supplied with the following, where ‘n’ is the candidate’s serial number.
(a) 150cm³ of potassium tetraoxomanganate(VII)solution in a corked flask or bottled labelled ‘A’n. These should all be the same containing 7.7g of KMnO4 per dm³ of solution.
(b) 150cm³ of iron(II)chloride solution in a corked flask or bottle labelled ‘Nn’. These should all be the same containing 19.1g of FeCl2 per dm³ of solution.
NB- FeCl2 solution should be freshly prepared.
– Each candidate should be provided with 150cm³ 2M H2SO4.
(c) One spatulaful of copper(II)chloride in a specimen bottle labelled ‘Cn’ and one spatulaful of ammonia carbonate in a specimen bottle labelled ‘Dn’.
Group I ( For all candidates)
Specimen A – Fresh/wet preserved mosquito larva in a petri dish containing water.
Specimen B – Fresh/wet preserved maggot in a petri dish containing water.
Specimen C – Gill of fish (freshly procured) in a petri dish containing water.
Specimen D – Lung of a small mammal(freshly preserved).
Specimen E – Dicotyledonous leaf (freshly plucked).
Specimen F – Membranous wing of a cockroach.
Group III (For candidates in Nigeria and the Gambia only)
Specimen K – Flower of pride of Barbados or caesalpinia
Specimen L – Mature Elephant grass or Guinea grass.
Specimen M – Flower of Hibiscus plant.
(i) All specimens can be provided as group specimens for five(5) to ten(10) candidates.
(ii) All specimens in each group must carry individual labels (Eg A, B, C, D, E and F in Group I)
+It is essential that each candidate should be provided with the following materials;
(i) glass jar cover or petri dish,
(ii) a beaker containing water,
(iii) a pair of forceps,
(iv) a hand of lens/magnifying lens,
(v) scalpel OR razor blade/knife
LIST OF SPECIMEN:
D: Hand trowel
F: Hand fork
For specimens G, H and I, you are requested to get some quantity of Sandy soil. Divide the quantity of Sandy soil into three portions.
Wash the first portion which is to be labelled G with a neutral solution(water) until the soup is neither acidic nor alkaline then air-dry the soil.
To the second portion which is to be labelled H, add some quantity of Hydrochloric acid(HCL) and air-dry.
To the third portion which is to be labelled I, add some quantity of sodium Hydroxide(NaOH) solution and air-dry.
Then supply to each candidate, samples of specimens G, H and I each in a beaker, some quantity of water, blue litmus paper, red litmus paper and a
J: Maize grain damaged by weevils
K: Yam tuber damaged by yam beetles
L: Cassava leaves showing mosaic disease symptoms
M: Tomato fruits showing fruit rot symptoms
N: Liver fluke(preserved/picture/diagram)
P: Trypanosome parasite(diagram/picture)