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2022 WAEC GCE - BIOLOGY ALTERNATIVE TO PRACTICAL QUESTIONS
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(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
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01-10: ABBADDBCDA
11-20: DCBDADCCAC
21-30: DDACDBABAD
31-40: DBADDBACCD
41-50: DCACBBDABD
*WAEC GCE BIOLOGY ANSWERS*
(1a)
(i) Incomplete metamorphosis; This refers to a type of insect development in which gradual changes occur in the insect during the development from the egg to the adult.
(ii) Complete metamorphosis; This is the type of insect development that includes egg, larva, pupal, and adult stages, which differ greatly in morphology.
(1bi)
(i) Cockroaches
(ii) Praying mantises
(iii) Termites
(1bii)
(i) Butterflies
(ii) Ants
(iii) fleas
(1c)
Diagram
(1d)
TABULATE
=BUTTERFLY=
(i) The life cycle of butterfly is of four stages: egg, pupa, larvae and adult
(ii) It undergoes complete metamorphosis
=COCKROACH=
(i) The life cycle of cockroach consist of three stages: egg, nymph and adult
(ii) It undergoes incomplete metamorphosis
(1e)
(i) Chrysalis; Butterfly
(ii) Ootheca; Cockroach
(iii) Maggot; Housefly
======================
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
*2b* DIAGRAM
*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
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
3a)
An ecosystem is a structural and functional unit of ecology where the living organisms interact with each other and the surrounding environment.
ii)
i) parasatism
ii) symbiosis
iii) commensalism
(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.
(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.
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