WAEC 2021 Biology Practical Question And Answer Now Available

WAEC 2021 Biology Answer-WakaGist.Com

(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)
[https://i.imgur.com/5vS8pBF.jpg]

(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

===========================

(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)
[img]https://i.imgur.com/r884Qna.jpg[/img]

================================

(4ai)
Phylum
SPECIMEN L – Arthropoda
SPECIMEN M – Arthropoda

(ii)
Class
SPECIMEN L – Insecta
SPECIMEN 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

SPECIMEN 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-

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

*(4ci)*
*L*
*(i) It carries disease vector that causes malaria*
*(ii) The larva serves as food to aquatic organisms*

*M*
*(i) The caterpillar of specimen M destroys vegetable crops*
*(ii) It helps in pollination*

(4e)
SPECIMEN L – Stagnant water
SPECIMEN M – Grasslands

Be the first to comment

Leave a Reply

Your email address will not be published.