2020 Waec Biology Practical Questions And Answers 31st August 2020

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Monday, 31st August 2020

Biology 3 (Practical) (Alternative A) 9:30 am – 11:30 am

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Biology 3 (Practical) (Alternative A) – 09:30 a.m. – 11:30a.m. (1st Set)
Biology 3 (Practical) (Alternative A) – 12:00 p.m – 2:00 p.m. (2nd Set)

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(4a)
TABULATE
– Specimen P-
– Test: 2 drops of specimen P in water
– Observation time(seconds): 3-4 seconds before it dissolves
– Medium of spread: Water
– Sense organ: Eye

-Specimen Q-
– Test: Teaspoon of specimen Q + water
– Observation time(seconds): Dissolves within 65 seconds
– Medium of spread: Water
– Sense organ: Eye

-Specimen R-
– Test: Cut section of specimen R
– Observation time(seconds): 2 seconds or almost immediately
– Medium of spread: Air
– Sense organ: Nose

(4b)
The biological phenomenon occurred is diffusion

(4c)
(i)
– Stiring
– heating
(ii)
– Shaking
– Stiring
(iii)
– Size of medium
– Wind

(4di)
DRAWING

(4dii)
It is Whorl

(4diii)
– Loop
– Whorl
– Arch/Compound

(4div)
– It is used in crime detection
– It is used as mark of identity
– It is used to determine paternity of a child

(4dv)
It is physiological variation

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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 (Biuret test)

(1c)
(i)Additional income is obtained through quality mushrooms
(ii)They contain vitamins and proteins and Laos acts as antioxidants supporting the immune system

(1di)
Fungi

(1dii)
(i)Eukaryotic organism
(ii)Absence of chlorophyll
(iii)Cell walls made of chitin instead of cellulose

(1diii)
(i)Molds
(ii)Mildews
(iii)Smuts
(iv)Rusts
(v)Yeast

(1ei)
Mullosca

(1eii)
(i)Presence of tentacles
(ii)Possession of soft and unsegmented bodies
(iii)Body is covered by a mantle and she’ll
(iv)They are bilaterally symmetrical
(v)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
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(2a)
E: Succulent Fruit
F: Berry/Flesh Fruit
H: Legume/Pod

(2b)
E: Parietal Plancentation
F: Axile Plancentation

(2c)
E: Human
F: Animal
H: Explosive Mechanism

(2di)
(i)It is dispersed when ripe because of its attractiveness
(ii)It’s seed is succulent and edible

(2dii)
(choose any 2)
i. Vitamin C
ii. Potassium
iii. Amino acid
iv. Magnesium

(2e)
(i) green
(ii) It signifies that it’s still young.

(2fi)
Marginal placentation

(2fii)


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