Waec Biology Practical Answers 2021 for 17th September

Waec Biology Practical Answers 2021 for 17th September 2021 Waec Biology Practical Questions and Answers – See all the answers and questions on Biology Practical for this year’s AUGUST/SEPTEMBER Waec Biology Practical exams Expo here. Check below for the questions and answers expo runz.

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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)

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

(4e)
L – Marshes
M – Grassland
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Waec Biology Practical Answers 2021 for 17th September 2021

Friday, 17th September 2021

  • Biology 3 (Practical) (Alternative A) 9:30 am. – 11:30 am. (1stSet)
  • Biology 3 (Alternative B) (Alternative to Practical Work) 9:30 am.–11:30 am.
  • Biology 3 (Practical)(Alternative A) 12:00noon.–2:00pm.(2ndSet)

EXAM TYPE: WAEC 2021


SUBJECT: BIOLOGY PRACTICAL


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