WAEC 2022 - BIOLOGY  ANSWER


BIOLOGY OBJ:
1-10: DCADABCADB
11-20: ABDBABDAAA
21-30: ACBABBCBCB
31-40: ABDDDBDACA
41-50: ACCADCDBBA


(1)


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(2a)
CHECK TABLE BELOW

(2bi)
TABULATE

HERBIVORE:
(i) Incisors are sharp and used mainly to cut, gnaw and bite
(ii)Molars and premolars have flat grinding surfaces and grow continuously throughout their lifetime
(iii) Dental formula I 2/3 C 0/0 PM 3/2 M3/3 = 28

CARNIVORE:
(i)Incisors are pointed and are used to catch prey
(ii)Molars and premolars are flattened with uneven edges and do not grow continuously throughout life.
(iii)Dental formula I 3/3 C1/1 PM 4/4 M 2/3 = 42

(2bii)
TABULATE

HUMAN:
(i)Dental formula I2/2 C1/1 PM2/2 M3/3 = 32
(ii)Molars and premolars do not grow continuously
(iii)Canines are conical
(iv)Teeth for feeding on plants and flesh

GOAT:
(i)Dental formula I2/2 C0/0 PM3/2 M3/3 = 28
(ii)Molars and premolars grow continuously
(iii)Have no canines
(iv)Teeth for feeding on only plants

(2c)
Milk teeth are the first set of teeth that grows when a child is a few months old and ready to feed on solid food. It lasts for only a short time.


(2)



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(5a)
TABULATE
=EARTHWORM=
(i) Straight
(ii) Simple
(iii) It feeds on fluid

=COCKROACH=
(i) Curve
(ii) More enveloped
(iii) It feeds on both fluid and solid

(5aii)
(i)Possession of crop
(ii)Possession of gizzard
(iii)Possession of pharynx

(5b)
(i) Water cycle
(ii) - Plant contribute through transpiration
- Animals contribute through respiration
- Animals contribute through perspiration
(iii)
- X: Condensation
- Y: Transpiration
- Z: Evaporation

(5c)
TABULATE

=ORGAN=
(i) Kidney
(ii) Skin

=DISEASES=
(i) Kidney stones, diuresis and oedema
(ii) Eczema, acne, vitiligo

(5di)
This is a process whereby heterotrophic organisms utilize the remains of one living tissue as a source of nutrition

(5dii)
(i) Fungi
(ii) Bacteria

(5diii)
Temperature

(5div)
Carbon cycle

(5e)
They exhibit heterotrophic nutrition known as carnivorous or insectivorous feeding. They have attractive colours that attracts insects to them. Once the insect lands in their spine, they are killed and digested