WAEC GCE Biology Answers 2022

Today 9th December, We Posted WAEC GCE Biology Answers 2022.

WAEC GCE Biology Answers 2022

(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 – Grasshopper

(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.

(2b)
DIAGRAM

(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

(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