WAEC 2021 Biology Practical Answer – May/June Expo

WAEC Biology Practical Answer

The West African Examinations Council WAEC Biology Practical Questions Answers 2021 Update.

2a)
TABULATE

D:
(Two observations)
(i) Gives greenish leaves
(ii) Gives growing seedlings

-Results-
Positive growth

E:
(Two observations)
(i) No growth observed
(ii) Wet soil

-Results-
Negative growth

F:
(Two observations)
(i) No growth observed
(ii) Dey soil

-Results-
Negative growth

G:
(Two observations)
(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)


(1ai)
A: Neck region
B: Chest region
C: Upper abdominal region

(1aii)
A: It allows the head to be turned easily, i.e Twisting of the head
B: It aids the attachment of the ribs
C: It provides attachment for abdominal muscles.

(1bi)

(1bii)
(i) Neural Spine: It protects upwards dorsally for the attachment of muscles
(ii) Centrum: It gives strength to the lumbar vertebra
(iii) Transverse Process: It projects from the sides of lumbar vertebra for the attachment of muscles and ligaments

(1ci)
A: 7
B: 12
C: 5

(1cii)
(i) Sacral vertebrae
(ii) Caudale vertebrae


(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)
SPECIMEN L:
(i) It carries disease vector that causes malaria
(ii) The larva serves as food to aquatic organisms

SPECIMEN 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:

SPECIMEN 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

SPECIMEN 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) They both flies
(iv) Possession of segmented body

(4e)
L – Marshes
M – Grassland

GOODLUCK!!!

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