2021 WAEC BIOLOGY PRACTICAL ANSWERS

BIOLOGY PRACTICAL ANSWERS

(1ai)
A – Neck
B – Chest
C – Upper abdominal region of the body

(1aii)
A – It aids the odontoid process of the head
B – It aid the attachment of ribs
C – It bears majority of body weight

(1bi) loading

(1bii)
(i) Neural canal; It allows the passage of the spinal cord
(ii) Centrum; It is a solid piece of bone found below the neural canal
(iii) Transverse process; It aids the attachment of muscle and ligaments
(iv) Neural spine; The aids the attachment of muscles

(1ci)
A – 7
B – 12
C – 6

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

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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)
Specimen 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