WAEC Biology Practical questions and answers 2021. Many WAEC candidates find it difficult to answer the WAEC Practical Biology correctly due to not understanding the questions. I will show you the best way to answer WAEC Biology Practical questions PDF and make a good grade in your Biology examination.
You need to understand the WAEC Biology Practical making scheme before attempting any question so as to present your answers in such a way that it will look attractive to the examiner to earn you big marks.
Bear it in mind that every single procedure is awarded marks. So, ensure you do not skip any step while reporting and presenting your practical results. And do not forget to remember that neat labeling is very important.
You will be expected to carry out an experiment and report your observation. What you will see will not be far from the WAEC Biology Specimen given to your school.
Note: Scroll to the bottom for today’s practical Biology answers.
WAEC Practical Biology Questions and Answers
Today’s WAEC Biology Practical Answers Loading…
(1ai)
A – Neck region
B – Chest region
C – Upper abdomen region
(1aii)
A – It provides mobility and stability to the head while connecting it to the relatively immobile thoracic spine.
B – It holds the rib cage and protects the heart and lungs
C – It supports the weight of the body and allow certain movements, such as lifting objects.
(1bii)
(i) Transverse process – Functions as the site of attachment for muscles and ligaments of the spine as well as the point of articulation of the ribs
(ii) Centrum – IIt supports most of the body’s weight.
(iii) Neural spine – It receives sensory messages from tiny nerves
(iv) Neural canal – It allows the passage of the spinal cord
(1ci)
A – 7
B – 12
C – 5
(1cii)
(i) Sacral vertebrae
(ii) Caudale vertebrae
2a)
PLEASE TABULATE
= D
-Two observation-
(i) Gives greenish leaves
(ii) Gives a growing seedlings
-Results-
Positive growth
= E
-Two observation-
(i) No growth observed
(ii) Wet soil
-Results-
Negative growth
= F
-Two observation-
(i) No growth observed
(ii) Dey soil
-Results-
Negative growth
= G
-Two observation-
(i) No growth observed
(ii) Extremely dry soil
-Results-
Negative growth
(2bi)
E – Excess water
F – Depletion of soil nutrient
G – Absence of water or soil moisture
(2bii)
(i) Well ventilated soil
(ii) Good and rich in nutrient soil
(4ai)
Phylum
L – Arthropoda
M – Arthropoda
(ii)
Class
L – Insecta
M – Insecta
(4bi)
(i)They have an exoskeleton or a hard, shell-like covering on the outside of its body.
(ii)Insects have three main body parts: head, thorax, and abdomen.
(iii)Insects have a pair of antennae on top of their heads.
(4bii)
(i)myriapods
(ii)arachnids
(iii)crustaceans
(4ci)
L
(i) It carries disease vector that causes malaria
(ii) The larva serves as food to aquatic organisms
M
(i) The caterpillar of specimen M destroys vegetable crops
(ii) It helps in pollination
(4cii)
(i) Controlled by Mosquito Traps
(ii) Controlled by Space sprays
(iii) Controlled by Mechanical Barriers
(iv) Controlled by Vegetation Management.
(v) Controlled by outdoor measures.
(4d)
TABULATE PLS
– L (ADULT MOSQUITO)
(i) Smaller in size
(ii) A Pair of wings
(iii) Absence of hard hind wings
(iv) Absence of maxillary palp/maxilla
(iv) Absence of spines on legs
– M(BUTTERFLY)
(i) Big in size
(ii) Two pairs of wings
(iii) Presence of hard hind wings
(iv) Presence of maxillary palp/maxilla
(v) Presence of spines on legs
(4dii)
(i) Possession of wings
(ii) Possession of antenna
(iii) Possession of proboscis
(iv) Possession of segmented body
(4e)
L – Terrestrial
M – Terrestrial
BIOLOGY PRACTICAL
Study Specimen A and B and answer question 1(a) to 1(c). (a)
(i) Name the habitat of each of specimens A and B.
(ii) Name the adult stage into which each of specimens A and B would develop.
(iii) Name of the phylum and class common to the adult stage of specimens A and B.
(b) State three observations features of biological significance in;
(i) Specimen A;
(ii) Specimen B.
(c)(i) State four observable structural differences between specimens A and B.
(ii) State three observable similarities between specimens A and B.
- WAEC Physics Practical
- Check WAEC Timetable to know the next exam
2. Study Specimen C, D and F and answer questions 2(a) to 2(c).
(a) (i) Name the organism from which each of specimens C, D and E, are obtained.
(ii) State the function common to specimens C, D and E.
(iii) State three observable features which adapt specimen C to its function.
(b) (i) State two observable structural similarities in specimens C and D
(ii) State three observable structural differences between specimen C and D.
(c) Make a drawing, 6cm to 8cm long of specimen C an label fully.
3. Study specimens K and L, and answer questions 3(a) to 3.
(a)(i) Name the floral part of specimen K.
(ii) Indicate the number of floral parts in each whorl of specimen K.
(b) (i) Name the sex of specimen K.
(ii) Give one reason for the answer in 4(b)(i).
(c)(i) What is the symmetry of specimen K?
(ii) Give one reason for the answer in 4 (c) (i).
(d) Name one pollinating agent of each of specimens K and L.
(e) State four observable differences between specimens, K and L,
(f) Make a drawing 8cm to 10cm long of the longitudinal section of the specimen K and label fully.
BIOLOGY PRACTICAL ANSWERS
1. (a) (i) Habitats of specimen A/ Larva of Mosquito: Stagnant water/swampy areas/poles/edge of stream. Specimen B/Maggot: Rotting/rotten/decaying/decomposing animals/decaying food/ human faeces/pit latrine.
(ii) Adult Stage of Specimen A/Larva of Mosquito: Mosquito/Anopheles mosquito/Culex mosquito/aedes mosquito. Specimen B/ Maggot; Housefly/Musca domestica.
(iii) Phylum and Class common to Specimen A and B phylum: Arthropoda. Class: Insecta
(b) Observable features of Biological significance in:
(i) Specimen A/ Larva of Mosquito:
- Presence of spiracles; for breathing/gaseous exchange
- presence of siphon/breathing trumpet/breathing tube; for breathing/ gaseous exchange
- Presence of antennae; for sensitivity
- Horny jaw/mouth; for chewing solid foods
- Mouth brushes; for sweeping food into its mouth
- Presence of bristles; to remain afloat/buoyancy/protection/defense
- Feather-like/feathery hair for defence
- Long/cylindrical body; for wriggling movement;
- Presence of eyes, for vision/sight/seeing.
(ii) Specimen B/Maggot:
- Hook at the mouth; for movement;
- Presence of eyes; for vision/
- (Small) spiny pad; for movement;
- (Small) mouth; for feeding, -Two pairs) of spiracles for breathing gaseous exchange.
(c)(i) differences between Specimen A and B
Specimen A/ Larva of Mosquito Specimen B/ Maggot
Mouth brushes present mouth brushes are absent
bristles present bristles are absent
anal gills present anal grills are absent
anterior end not pointed anterior end is pointed
posterior end not blunt/wide posterior end is blunt/wide
has antennae absence of antennae
three body divisions/Head, Thorax, Abdomen Two body divisions/head, and trunk
has one spiracle has two pairs of spiracles
hook absent hook is present
siphon/breathing trumpet/ siphon/breathing trumpet
tube present tube absent
pad absent pad present
eye present eye absent
(ii) Similarities between specimen A and B; – They both have segmented body;
they both possess spiracle
they both have mouth
both have elongated/long body/cylindrical
2(a)(i) Name of organism where specimens C/Gill, D/Lung and E/leaf are obtained, specimen C/ Gill; Tilapia/Catfish
Specimen D/Lung: Goat/Cow/Guinea pig
Specimen E/Leaf: -Mango plant/cashew plant/orange plant
(ii) Function common to specimen C/Gill, D/Lung and E/Leaf: -Gaseous exchange respiration
(iii) Observable features that adapt specimen C to its function: -it is moist; for diffusion of dissolved gases/gaseous exchange; -it is thin-walled/thin membrane; tomake diffusion easy; – it is richly supplied with blood vessels/blood capilaries/highly vascularized as diffusion medium/for gaseous exchange; -Has a large surface area; to increase the rate of diffusion of gases.
(b)(i) Observable Similarities Between Specimens C, and D: -Both have a mouth of capillaries/are highly vascularized; -Both are pink/red in colour/Have minted surfaces; -are thin-walled membrane -Have large surface area.
(ii) Observable structural differences between specimens C and D
Specimen C/Gill Specimen D/Lung
Gill Rakers Present Gill Rakers Absent
Gill Arch/Bar Present Gill Arch/Bar Absent
Gill Lamella Present Gill Lamella Absent
Gill Filaments Present Gill Filaments Absent
Pleural Membrane Absent Pleural Membrane Present
Pleural Cavity Absent Pleural Cavity Present
Not Fluffy Fluffy/Soft
3(a)(i) Floral parts of Specimen K/Pride of Barbados flower: -Sepals/calyx; -Petals/corolla: – Stamen/androecium; -Pistil/gynoecium/carpel. (ii) Number of Floral parts of Specimen K/Pride of Barbados flower: -Sepals/Calyx: 5/4 + 1 -Petals/corolla 5/4 + 1 -Stamen/androecium: 10 -Pistil/gynoecium/carpel 1
(b)(i) Sex of Specimen K/Pride of Barbados flower; Hermaphrodite/bisexual (ii) Reason for the answer in b (i) it has both stamen and pistil/male and female organs/androecium and gynoecium.
(c)(i) Symmetry of Specimen K/Pride of Barbados flower: Bilateral/bilaterally symmetrical.
(ii) Reason for the answer in (c)(i): it can be cut into two equal halves along only one plane. (d) Name of pollinating agent of specimens K/Pride of Barbados flower and L/Elephant grass: Specimen K/Pride of Barbados: Butterfly/Bees, Specimen L/Elephant grass: Wind
(c) observable differences between Specimens K and L
Specimen K/Pride of Barbados flower Specimen L/Elephant grass
Flowers are conspicous/large Flowers are inconspicous/small
Brightly coloured flowers/yellow/red Dull coloured flowers/green
Scented flowers Not scented flowers
large/sticky pollen grains small/light pollen grains
stigma is sticky stigma is not sticky
The 2021 WAEC Biology Practical Questions and Answers (expo) will be posted here on the day of the Practical Biology exam before the exam starts. The above questions and answers are strictly for practice showing how to present your answers
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Today’s WAEC Biology Practical answers.
(1ai) (2020 Answers)
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
(2di)
Specimen E attract birds, squirrels, and other small mammals. Consumption of the fruit will lead to dispersal of the seeds in feces (by human)
(2dii)
(i)Vitamin C
(ii)Magnesium
(2ei)
Green
(2eii)
It signify that they are still young
(2fi)
Marginal placentation
(2fii)
=====================
(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
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