How to Get 2020 WAEC BIOLOGY PRACTICAL Question Paper.

WAEC biology practical
===
+++++++++++++++++++++++++++++++++
(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: Succulent Fruit
F: Berry/Flesh Fruit
H: Legume/Pod
(2b)
E: Parietal Plancentation
F: Axile Plancentation
(2c)
E: Human
F: Animal
H: Explosive Mechanism
2dii)
(choose any 2)
i. Vitamin C
ii. Potassium
iii. Amino acid
iv. Magnesium
2ei) green
===============================
(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)
Osmosis
(4c)
(i)
– Increase in temperature
– Difference in concentration
(ii)
– Molecular size
– Increase in temperature
(iii)
– Increase in temperature
– Difference in concentration
(4di)
(4dii)
It is Whorl
(4diii)
– Loop
– Whorl
– Arch/Compound
(4div)
– Crime detections
– Identification of individuals
– Genetic variation in man
(4dv)
Discontinuous variation
+++++++++++++++++++++++++++++++++