WAEC GCE BIOLOGY (OBJ&ESSAY EXPO ANSWERS;-ExamgrandComNg

WAEC GCE BIOLOGY:-ExamgrandComNg
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WAEC GCE BIOLOGY ANSWERS;-ExamgrandComNg!!!!!  

(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.

2ai)
Mouth
The digestion process begins when you start chewing your food.

Your teeth break the food into smaller pieces, and your saliva moistens the food so that it’s easier for it to move through your esophagus and into your stomach. Your saliva also contains enzymes that begin breaking down the fat in your food.

(ii) Deodenum

Bile grabs onto the fats, and the emulsifiers increase their surface area, making them easier for digestive enzymes to act on. Following this, enzymes break apart fatty acids. Lipase from the pancreas further digests fats into monoglycerides and fatty acids

(Ci)
Peristalsis refers to the contraction and relaxation of the food in the oesophagus and the food pipe and the food is forced down the track to the stomach

(Cii) 
i) salivary glands
ii) liver 
iii) gall bladder, 
iv)ancreas

(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

(3)

USE THIS 3B BELOW 👇
(3b)
(i) It is the base or the primary structure as well as the functional unit of ecology.

(ii) The structure of an ecosystem mainly depends upon the diversity in species it has.

(iii) The main function of the ecosystem is the energy flow and the passing of nutrients in and out of the system.

(3c)

(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