WAEC 2021 - BIOLOGY PRACTICAL ANSWER


(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.

(1bi)


(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

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(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

(2c)


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(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)moveable head
(ii)stagnant water

M
(i)oversized compound eyes
(ii)grasslands

(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

- H (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