==> 2020 WAEC BIOLOGY PRACTICAL ANSWERS
TAKE NOTE: ✔️✔️✔️
NUMBER 1 2 AND 4 IS FOR CANDIDATE IN NIGERIA
WHILE NUMBER 3 IS FOR CANDIDATE IN GHANA ONLY
DONE FOR TODAY
GOOD LUCK
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(1ai)
TABULATE
- TEST: Specimen B + 2drops of iodine solution
- OBSERVATION: No precipitate is found (No reaction is occurring)
INFERENCE: It indicates specimen B contains no starch content
(1aii)
TABULATE
- TEST: Specimen B + 2ml of NaOH(aq) + 3 drops of CuSO4 + shake
- OBSERVATION: The mixture will turn to purple or violet colour
- INFERENCE: Protein is present
(1b)
(i) Test for starch
(ii) Test for protein (Biurets test)
(1c)
- Additional income is obtained through quality mushrooms
- They contain vitamins and proteins and Laos acts as antioxidants supporting the immune system
(1di)
Fungi
(1dii)
- Eukaryotic organism
- Absence of chlorophyll
- Cell walls made of chitin instead of cellulose
(1diii)
- Molds
- Mildews
- Smuts
- Rusts
- Yeast
(1ei)
Mullosca
(1eii)
- Presence of tentacles
- Possession of soft and unsegmented bodies
- Body is covered by a mantle and she’ll
- They are bilaterally symmetrical
- They are triploblastic with three layers
(1fi)
- Specimen C (mushrooms) are decomposers breaking down surface waste releasing nitrogen back into the soil in form of ammonium nitrate, a nutrient essential for plant survival
(1fii)
Saprophytic mode of nutrition
(2a)
E – Berry
F – Berry
H – Dry Dehiscent Fruits
(2b)
E – Parietal placentation
F – Axile placentation
(2c)
E – Animals
F – Animals
H – Self dispersal
(2di)
Birds, squirrels, and other small mammals consumes the fruit which will lead to dispersal of the seeds in faeces or as they carry them from the tree to their habitats
(2dii)
(i) Vitamin such as vitamin C
(ii) Mineral such as Potassium, magnesium, iron
(2ei)
Green
(2eii)
It signifies that the pod is young and immature
(2fi)
Marginal placentation
(2fii)
DRAWING
(4ai)
TABULATE:
-TEST: 2 drops of specimen P in a Beaker of water, allowed to stand
-OBSERVATION TIME (seconds): A trail of it’s purplr colour goes to the bottom and difuses in 605secs
-MEDUIM OF SPREAD: Liquid (slow difusion)
-SENSE ORGAN: EYES
(4aii)
-TEST: A levelled spoonful of specimen Q in a beaker of water, stir
-OBSERVATION TIME (seconds):197 seconds
-MEDUIM OF SPREAD: Liquid (moderate difussion)
-SENSE ORGAN: EYES
(4aiii)
-TEST: Specime R cut open and notice the time odour was smelt
-OBSERVATION TIME (seconds): 2 Seconds
-MEDUIM OF SPREAD: Air (fast difussion)
-SENSE ORGAN: Nose
(4b)
Diffusion of gases
(4ci)
(i) Stirring
(ii) Heating
(4cii)
(i) Shaking
(ii) Stirring
(4ciii)
(i) Size of medium
(ii) Wind
(4d)
PLACE YOUR THUMPRINT IN UR PAPER PLS
(4dii)
PLS NAME YOUR PATERN OF UR FINGERPRINT(SEE THE TYPES BELOW)
(4diii)
[Choose ANy THREE]
(i) Loop
(ii) Arch
(iii) Compound
(iv) Whorl
(4div)
(i) It is used in crime detection
(ii) It used as mark of identity
(iii) It is used to determine paternity of a child
(4dv)
Morpholigical variation