WAEC GCE 2022 - BIOLOGY  ANSWER


BIOLOGY PRACTICAL  ANSWER

(1ai)
Lizard

(1aii)
I - Eye
II - Ear drum
III - scales
IV - Digits with claws
V - Hind limb
VI - Tail

(1bi)
(PICK ANY ONE)
(i) Rocky areas
(ii) Trees
(iii) Forest

(1bii)
(PICK ANY THREE)
(i) Presence of limbs for movement
(ii) Presence of eye for sight
(iii) Presence of scales for protection and warmth.
(iv) Presence of claws for grasping of preys

(1biii)
Territoriality

(1ci)
Female

(1cii)
(i) The absence of the gular fold in the organism.

(1di)
Reptalia

(1dii)
The presence of dry scally skin

(1diii)
(i) Snake
(ii) Crocodile
(iii) Wall gecko

(1e)
Holozoic mode of nutrition

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(2)



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(3ai)
Aquatic habitat or fresh water habitat

(3aii)
I - Littoral zone
II - Littoral zone
III - Littoral zone
IV - Benthic zone
V - Benthic zone

(3aiii)
I ---> II ---> III ---> V

(3bi)
Serves as a source of energy i.e solar energy altimate source of energy

(3bii)
There will be shortage of food in the habitat or there will be no energy flow

(3ci)
-Tadpoles
-Fish (shark)

(3cii)
-Water
-Sunlight

(3d)
I - Photosynthetic or authotrophic
II - Herotrophic i.e Herbivorous
III - Heterotrophic i.e Carnivorous

(3e)
(i) Presence of waxy cuticles on leaves for evapotranspiration
(ii) Presence of breathing roots for gaseous exchange

(3f)
-Mud



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BIOLOGY OBJ
1-10: ABBADDBCDA
11-20: DCBDADCCAC
21-30: DDACDBABAD
31-40: DBADDBACCD
41-50: DCACBBDABD



(1ai)
Metamorphosis is a series of gradual changes in forms and structures of an insect from egg stage to adult stage or imago.

(1aii)
In a tabular form:

Two types of Metamorphosis:
I. Complete netamorphosis

II. Incomplete metamorphosis

Three examples each of insects that undergo the type of Metamorphosis:

Complete metamorphosis:
(i) House fly
(ii) Mosquito
(iii) Butterfly

Incomplete metamorphosis:
(i) Cockroach
(ii) Grasshopper
(iii) Termite

(1aiii )
I. Complete metamorphosis is a form of metamorphosis that involves four different stages that is from egg - larva - pupa - adult.

II. Incomplete metamorphosis is a form of metamorphosis that involves two or three different stages, that is from egg - nymph - adult.

(1b)
(i) Maggot - Housefly.
(ii) Chrysalis- Aphid
(iii) Caterpillar - Butterfly
(iv) Nymph - Grasshoppers

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(2ai)
As the meal passes through the mouth. The meal remain unaffected because there is no chemical substances to act on them.

(2aii)
As it passes through the duodenum, the meal is been converted from fat to fatty acid.



(2ci)
It is the wavelike movement of bolus (food substance) through the oesophagus down to the stomach.

(2cii)
(i) Tongue
(ii) Stomach
(iii) Small intestine


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(5ai)
Cell theory

(5aii)
Robert Hooke: He was the first to discover the honeycomb like structure of a cell.

Theodor Schwann: He discovered that the bodies of all animals are made up of cell in 1839

(5bi)
In a tabular form:

TEST:
Urine + Benedict solution + heat.

OBSERVATION:
The colour of urine becomes brick red or orange.

INFERENCE:
Glucose is present.
C6H12O6

(5bii)
Diabetes Insipidus

(5biii)
Insulin

(5biv)
Pancreas

(5ci)
(Pick any TWO)
(i) High birthrate
(ii) Availability of food.
(iii) Availability of basic infrastructural amenities.

(5cii)
(Pick any TWO)
(i) Natural disasters.
(ii) Increase in high rate of diseases.
(iii) Insufficient food supply.

(5di)
Primary succession is a community of pre-existing organisms that have been in existence follow by the immediate replacement of those organism in a particular habitat.

(5dii)
(i) Community of monkeys/baboons.
(ii) Community of tilapia fish and cat fish.
(iii) Population of grasshoppers and locust

(5e)
(i) Oesophagus: It allowed the paristaltic movement or passage of food from the mouth to the crop.
(ii) Stomach: It stores food temporarily for digestion.
(iii) Intestine: It is an area where digestion is complete and digested food are absorbed.
(iv) Anus: It is a part were undigested food eh faeces are removed.
(v) Gizzard: It is the part where food particles, sand and grits are been grinded for proper digestion.

(5f)
(i) skin
(ii) kidney
(iii) liver