WAEC Biology Practical Questions and Answers 2021 Free Theory and Objective

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BIOLOGY PRACTICAL ANSWERS
(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
(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)
(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
[17/09, 10:24] Ogabido: (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

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