2021/2022 GCE/WAEC EXPOSED QUESTIONS AND ANSWERS FOR BIOLOGY (OBJ /THEORY).
Biology WAEC Questions 2021 in this article, I will be screening you past Biology objective and theory random repeated questions for free.
You will also understand how WAEC Biology questions are set and many other examination guides. Stay focus and read through.
You will also understand how WAEC Biology questions are set and many other examination guides. Stay focus and read through.
WAEC GCE Biology Questions 2021
The West African Examinations Council (WAEC) is an examination board that conducts the West African Senior School Certificate Examination,
for University and Jamb entry examination in West Africa countries.
In a year, over three million candidates registered for the exams coordinated by WAEC
The West African Examination Council, WAEC, August/ September Gce Biology exam paper will be written on Tuesday, 4th September, 2018.
The Biology 2 (Essay) paper will start by 09:30am and will last for 1hr 40mins while the biology 1
(Objective) exam will commence 11.10am and will last for 50mins.
In this situation, we will be posting out samples of the waec biology
Questions for candidates that will partake in the examination from past questions.
Keep accessing this page as update will be made in a instantaneous
1-10: ABBCCCDCCA
11-20: AABAADBDBA
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31-40: CDADCCCBBB
41-50: CACAAABCAC
1a) Plants take in some compounds like carbon dioxide through their leaves.
They absorb some other materials such as compounds of nitrogen, phosphorus, etc.,
from the soil through their roots.
The transport system consists of tube like passages made up of vascular tissue.
There are two types of vascular tissues in plants—xylem and phloem.
The vascular system extends from the roots through the stem and continues up to the leaves.
In the leaves it is clearly seen as a pattern of veins.
Water and minerals are transported from the roots upwards through the xylem tubes.
2a) Enzyme is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
2a(i) all enzymes are proteins.
(Ii ) Enzymes possess great catalytic power.
(iii) Enzymes are highly specific
(iv) Enzymes show varying degree of specificities.
(v) Absolute specificity where the enzyme react specifically with only one substrate.
2b) pancreatic fluid or juice contains digestive enzymes that pass to the small intestine where they help to further
Break down the carbohydrates, proteins,
And lipids (fats) in the chyme. Pancreatic
Juice is a liquid secreted by the pancreas,
Which contains a variety of enzymes?
Including trypsinogen, chymotrypsinogen, elastase, carboxypeptidase, pancreatic lipase, nucleases, and andamylase.
Pancreatic juice is alkaline in nature due to the high concentration of bicarbonate ions. This is
useful in neutralizing the acidic gastric acid, allowing for effective enzymic action.
(2c) most importantly, sun provides vitamin D which helps the body absorb the minerals calcium and phosphorus from the food that the boy eat,
which is important for bone health. While milk is the main source of
dietary calcium. Calcium is a major bone mineral, mandatory for bone health.
2d) (i) Photosynthesis conducted by plants is also an important part of the carbon cycle.
(ii) It releases oxygen needed for breathing
(iii) It serves as source of food manufacturing for human rights
(iv) It provides sources for fuel through plants
(v)it help to balance the ecosystem
Q.3. Microoganism
light
Water pressure,
currents,
temperature
6a)(i) mimicry is a similarity of one species to another that protects one or both.
An example of this is the cuckoo bee.
(ii) Camouflage is the structural adaption that enables specie s to blend with theirSurroundings;
allows a species to avoid Detection by predators.
6b)(i) Their legs are adapted for running
(ii) They adapts the leathery forewings asTemina to provide a protective cover for the second set of wings.
(iii) They evolved mandibles to bite and chew solid food.
6c)(i) It reduces the quality and quantity of the crops
(ii)it reduces their productivity
6d)(I) by refrigerating
(Ii) By saltin
(iii) By drying]
(iv) By the use of silos
6e)(i) in medicin
(II) in crime detection
Section B [Essay].
Answer any FOUR questions.
Write your answers on the answer booklet provided.
1. (a) Describe briefly the role of the stomach in digestion.
(b) (i) Name three parts of plants in which food can be stored
(ii) Give one example in each case.
(c) Explain briefly how the level of sugar in the mammalian blood can be regulated.
2. (a)(i) What is sexual reproduction?
(ii) Name four organs in mammals that produce sex hormones.
(iii) Name one sex hormone produced by each of the organs named in 2(a)(i).
(b) In a tabular form outline three differences between reproductions in lizards and birds.
(c) (i) How are identical twins forms in humans?
(ii) State three characteristics features of identical twins.
3.(a) Explain the following terms:
(i) disease;
(ii) symptoms of diseases
(b) (i) List two physical and two chemical barriers that prevent pathogens from penetrating the body of an organism.
(ii) Explain how vaccination protects the body from contracting infectious diseases.
(c) Distinguish between an antibody and an antigen.
(d) Name the causative agents of: (i) Malaria; (ii) Cholera; (iii) AIDS.
4. (i) What is respiration?
(ii) In a tabular form, state four differences between gaseous exchange and aerobic respiration
(b) (i) Explain the term residual air.
(ii) What is the importance of residual air to mammals?
(iii) State four characteristic features associated with respiratory structures.
(c) (i) What is oxygen debt?
(ii) Outline three activities that can result in oxygen debt.
5. (a) (i) What is conservation?
(ii) State six factors responsible for the decline of the abundance and variety of wildlife.
(b) Outline six ways in which the government can improve the situation in 5(a) (ii) above.
(c) (i) What is Eutrophication?
(ii) State two causes of eutrophication.
6. (a) What is photosynthesis?
List: (i) four external factors;
(ii) two internal factors; that affect the rate of photosynthesis.
(b) (i) List the major products of the light dependent stage of photosynthesis.
(ii) State the importance of each of the products listed in 6(c) (i) above.
(c) (i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants.
7. (a) (i) What is a gene?
(ii) Differentiate between the terms genotype and phenotype.
(b) Explain the following terms: (i) hybrid; (ii) pure breeding; (iii) nucleotide.
(c) In garden pea seeds, smooth seed coat is dominant over rough seed coat.
With the aid of a genetic diagram, determine the result expected if a homozygous rough pea is
crossed with a smooth seed coat plant whose parent were rough coated. .
Section B [Essay].
Answer any FOUR questions.
Write your answers on the answer booklet provided.
1. (a) Describe briefly the role of the stomach in digestion.
(b) (i) Name three parts of plants in which food can be stored
(ii) Give one example in each case.
(c) Explain briefly how the level of sugar in the mammalian blood can be regulated.
2. (a)(i) What is sexual reproduction?
(ii) Name four organs in mammals that produce sex hormones.
(iii) Name one sex hormone produced by each of the organs named in 2(a)(i).
(b) In a tabular form outline three differences between reproductions in lizards and birds.
(c) (i) How are identical twins forms in humans?
(ii) State three characteristics features of identical twins.
3.(a) Explain the following terms:
(i) disease;
(ii) symptoms of diseases
(b) (i) List two physical and two chemical barriers that prevent pathogens from penetrating the body of an organism.
(ii) Explain how vaccination protects the body from contracting infectious diseases.
(c) Distinguish between an antibody and an antigen.
(d) Name the causative agents of: (i) Malaria; (ii) Cholera; (iii) AIDS.
4. (i) What is respiration?
(ii) In a tabular form, state four differences between gaseous exchange and aerobic respiration
(b) (i) Explain the term residual air.
(ii) What is the importance of residual air to mammals?
(iii) State four characteristic features associated with respiratory structures.
(c) (i) What is oxygen debt?
(ii) Outline three activities that can result in oxygen debt.
5. (a) (i) What is conservation?
(ii) State six factors responsible for the decline of the abundance and variety of wildlife.
(b) Outline six ways in which the government can improve the situation in 5(a) (ii) above.
(c) (i) What is Eutrophication?
(ii) State two causes of eutrophication.
6. (a) What is photosynthesis?
List: (i) four external factors;
(ii) two internal factors; that affect the rate of photosynthesis.
(b) (i) List the major products of the light dependent stage of photosynthesis.
(ii) State the importance of each of the products listed in 6(c) (i) above.
(c) (i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants.
7. (a) (i) What is a gene?
(ii) Differentiate between the terms genotype and phenotype.
(b) Explain the following terms: (i) hybrid; (ii) pure breeding; (iii) nucleotide.
(c) In garden pea seeds, smooth seed coat is dominant over rough seed coat.
With the aid of a genetic diagram, determine the result expected if a homozygous rough pea is
crossed with a smooth seed coat plant whose parent were rough coated. .
8. (a) (i) Describe epigeal germination of a seed.
(ii) In a tabular form, state three differences between epigeal germination and hypogeal germination.
(b) (i) What is seed dormancy?
(ii) State three ways by which dormancy in seeds can be broken.
(c) State six advantages of using contraceptives in human populations.
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