2011 WAEC (WASSCE) Biology Past Questions & Answers

Question 1

If a person has two alleles of the sickle cell anaemia gene, the person

Accepted Answer

C. has the disease

Answer

A. is a heterozygous carrier of the disease

Answer

B. is immune to the disease and cannot pass it on to an offspring

Answer

D. is probably of Asian ancestry

Question 2

The following are abiotic components of an ecosystem except

Accepted Answer

C. bacteria

Answer

A. temperature

Answer

B. oxygen

Answer

D. soil

Question 3

Which of the following cells are not regarded as specialized?

Accepted Answer

D. somatic cells

Answer

A. Sperm cells

Answer

B. Root up cells

Answer

C. Muscle cells

Question 4

In which of the following habitats is Paramecium no found

Accepted Answer

B. Aquarium

Answer

A. Pond

Answer

C. Lake

Answer

D. Puddle

Question 5

Which of the following pairs of cells carry out the same function?

Accepted Answer

B. Spermatozoan and ovum

Answer

A. Check cell and red blood cell

Answer

C. Palisade cell and epidermal cell

Answer

D. Root tip cell and guard cell

Question 6

A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a

Accepted Answer

C. protein

Answer

A. carbohydrate

Answer

B. fat

Answer

D. sugar

Question 7

Which of the following activities promotes forest conservation?

Accepted Answer

C. Afforestation

Answer

A. Lumbering

Answer

B. Use of firewood for cooking

Answer

D. Production of paper

Question 8

Which of the following statements is not true about continuous variation? It

Accepted Answer

D. is usually controlled by one or two pair(s) of genes

Answer

A. is usually controlled by several genes

Answer

B. can be influenced by environmental factors

Answer

C. follows a normal distribution curve

Question 9

The rate of decomposition of organisms is faster in the tropical rain forest than in other biomes because

Accepted Answer

C. of abundance of water

Answer

A. of the relatively constant daylight

Answer

B. there are more plants per square feet

Answer

D. of constant cool temperature

Question 10

Cells that utilise a lot of energy are characterized by the presence of a large number of

Accepted Answer

B. mitochondria

Answer

A. vacuoles

Answer

C. endoplasmic reticulum

Answer

D. ribosomes

Question 11

Vaccination results in

Accepted Answer

B. production of antibodies which destroy toxins of germs

Answer

A. aiding red blood cells to carry more oxygen

Answer

C. arresting excessive bleeding

Answer

D. production of white blood cells which engulf and digest bacteria.

Question 12

Some animals return to water bodies to reproduce because

Accepted Answer

B. water nourishes their embryos and their young ones

Answer

A. natural enemies destroy their eggs on land

Answer

C. they are close to their ancestors and imitate them

Answer

D. the temperature on land is not suitable for the development of their embryos

Question 13

Which of the following methods does not make water fit for drinking?

Accepted Answer

D. Addition of alum

Answer

A. Addition of chlorine

Answer

B. Boiling

Answer

C. Distillation

Question 14

ore sweat is produced during muscular exercise because

Accepted Answer

C. the temperature of the body rises

Answer

A. the contracting muscles produce water

Answer

B. fermentation occurs in muscles

Answer

D. the muscle fatigues

Question 15

The part labelled I is called the

Accepted Answer

B. centromere

Answer

A. nucleolus

Answer

C. centriole

Answer

D. spindle

Question 16

The conversion of glucose to starch in the leaf during the day principally

Accepted Answer

B. prevents osmotic problems

Answer

A. enables photosynthesis

Answer

C. enables the leaf to store the starch

Answer

D. enables glucose to be used up

Question 17

Natural selection is a consequence of

Accepted Answer

C. variation in organisms

Answer

A. distribution of organisms

Answer

B. adverse conditions

Answer

D. inbreeding

Question 18

The following organisms are producers except

Accepted Answer

B. Mushroom

Answer

A. Hibiscus

Answer

C. Cactus

Answer

D. Spirogyra

Question 19

Which of the following statements about photosynthesis is not true?

Accepted Answer

A. Plants can photosynthesize without an increase in dry weight

Answer

B. Carbon dioxide is absorbed by the leaves in bright light

Answer

C. oxygen is produced during photosynthesis from the breakdown of water

Answer

D. Photosynthesis occurs in green plants

Question 20

Assuming that a period of stable population size is followed by a period when natality increases by ten (1O) per cent and immigration increases by twenty (20) percent of population size. The population size will

Accepted Answer

C. begin to increase

Answer

A. be at equilibrium

Answer

B. increase by forty (40) per cent

Answer

D. begin to decrease

Question 21

During sexual reproduction in Paramecium, how many times does the zygote divide to produce eight nuclei?

Accepted Answer

C. 3

Answer

A. 1

Answer

B. 2

Answer

D. 4

Question 22

The falling off of leaves of deciduous trees is helpful to the plant because it

Accepted Answer

A. reduces the rate of transpiration

Answer

B. enables the plant to conveniently eliminate its excretory products

Answer

C. enables the plant to bear more fruits

Answer

D. ensures that the limited mineral salts get to only growing regions

Question 23

Which of the following structures produces the greatest variety of digestive enzymes?

Accepted Answer

B. Pancreas

Answer

A. Salivary glands

Answer

C. Stomach

Answer

D. Colon

Question 24

Which of the following practices improves crop yield in a clayey soil? Addition of

Accepted Answer

B. lime and humus

Answer

A. more water and humus

Answer

C. fertilizers

Answer

D. weedicides and fertilizers

Question 25

Filtrate in the Bowman’s capsule contains vitamins because

Accepted Answer

C. they have low molecular weight

Answer

A. only all le amount is required by the body

Answer

B. they can be reabsorbed into the blood

Answer

D. most of them are fat soluble.

Question 26

Adenine pairs with thymine because

Accepted Answer

D. one is a purine base and the other a pyrimidine.

Answer

A. the two occur in the same nucleic acid

Answer

B. one is a strong base and the other a weak base

Answer

C. two purine bases easily pair up

Question 27

Which of the following is not an effector organ?

Accepted Answer

C. Nose bridge

Answer

A. Tongue

Answer

B. Skin

Answer

D. Ear glands

Question 28

Inhaled air is made warm and moist in the

Accepted Answer

B. nasal cavity

Answer

A. epiglottis

Answer

C. trachea

Answer

D. mouth

Question 29

Which of the following structures is a tissue

Accepted Answer

B. Blood

Answer

A. Vessel element

Answer

C. Sieve tube element

Answer

D. Erythrocyte

Question 30

Which of the following methods is appropriate for the cultivation of cassava?

Accepted Answer

D. Stem cutting

Answer

A. Budding

Answer

B. Fragmentation

Answer

C. Root cutting

Question 31

A monocot root IS different from a dicot root by having

Accepted Answer

C. wide pith

Answer

A. endodermis

Answer

B. cambium

Answer

D. root hair.

Question 32

Which of the following neurons may not have myelin sheath?

Accepted Answer

B. Intermediate neurons

Answer

A. Effector cells

Answer

C. Motor neurons

Answer

D. Sensory neurons

Question 33

If Amoeba is placed in a salt solution. the contractile vacuoles would

Accepted Answer

C. be formed less frequently

Answer

A. be bursting more frequently

Answer

B. be more numerous

Answer

D. grow bigger before they burst

Question 34

Which of the following structures is not involve in respiration?

Accepted Answer

C. Stomach

Answer

A. Lung books

Answer

B. Mouth

Answer

D. Trachea

Question 35

The following processes are involved in water movement in the endodermis except

Accepted Answer

D. active transport

Answer

A. osmosis

Answer

B. vascuolar pathway

Answer

C. diffusion

Question 36

Use the information on capture-recapture method to calculate the total number of organisms in a habitat. First capture = 200 Second capture = 120 Number of organisms with mark in second capture = 40 The total number of organisms therefore is

A.200
B.360
C.600
D.800

Show answer

Answer: C. 600

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Accepted Answer

C. 600

Answer

A. 200

Answer

B. 360

Answer

D. 800

Question 37

Which of the following statements best describes protein synthesis?

Accepted Answer

B. translocation oft e ribosomes exposes a new codon for base pairing with an amino acid

Answer

A. DNA is directly involved in translation

Answer

C. Each tRNA with a particular anticodon always carries a different protein in the process

Answer

D. One amino acid is always carried by more than one

Question 38

Kreb’s cycle occurs in the

Accepted Answer

A. mitochondria

Answer

B. cytoplasm

Answer

C. nucleus

Answer

D. ribosomes

Question 39

What will be the chromosome number of the hybrid of two varieties of a plant with 36 chromosomes in the endosperm cell?

Accepted Answer

B. 24

Answer

A. 12

Answer

C. 35

Answer

D. 48

Question 40

A sample of wet garden soil of known weigh was heated to constant weight. The loss of weight is due to loss of

Accepted Answer

A. water

Answer

B. organic matter

Answer

C. water and organic matter

Answer

D. water and inorganic matter

Question 41

The branch of Biology that deals with the principles of classification of organisms is known as

Accepted Answer

C. taxonomy

Answer

A. biological index

Answer

B. nomenclature

Answer

D. ecology

Question 42

Ecological investigation in a habitat includes the following procedures except

Accepted Answer

C. determining the genetic makeup of specimens

Answer

A. choosing a habitat

Answer

B. identification of specimens

Answer

D. measuring abiotic and biotic factors

Question 43

The removal of all the phloem tissues of the stem of a plant close to the root system for a long period of time is likely to

Accepted Answer

D. cause the p ant to wither and die

Answer

A. provide more energy to the roots

Answer

B. accumulate more starch in the roots

Answer

C. cause the underground roots to develop buds

Question 44

Which of the following substances when lost from the body of a mammal will not be returned to the ecosystem?

Accepted Answer

C. Heat energy

Answer

A. Sweat

Answer

B. Urea

Answer

D. Carbon dioxide

Question 45

Acquired characters are

Accepted Answer

C. caused by the environment

Answer

A. received from parents

Answer

B. passed to offspring

Answer

D. caused by mutation

Question 46

Which of the following enzymes is active in the duodenum?

Accepted Answer

C. Trypsin

Answer

A. Pepsin

Answer

B. Renin

Answer

D. Amylase

Question 47

A vestigial structure in humans is

Accepted Answer

C. tail bone

Answer

A. earlobe

Answer

B. toe bone

Answer

D. spleen

Question 48

Which of the following groups of substances are not six-carbon compounds?

Accepted Answer

D. Pyruvate and cellulose

Answer

A. Glucose and lactose

Answer

B. Lactose and cellulose

Answer

C. Glucose, Lactose and Pyruvate

Question 49

Differences in characteristics observed between individuals of the same species is known as

Accepted Answer

D. variation

Answer

A. trait

Answer

B. phenotype

Answer

C. mutation

Question 50

Leguminous crops are incorporated into crop rotation in order to

Accepted Answer

B. promote nitrogen fixation

Answer

A. improve aeration of the soil.

Answer

C. increase the rate of soil formation

Answer

D. improve upon the water holding capacity of the soil

Question 51

A man with blood group It IA IA is married to a woman with blood group IA IO. The blood group of their son is likely to be

Accepted Answer

A. A

Answer

B. O

Answer

C. B

Answer

D. AB

Question 52

Which of the following components of Larmark’s theory of evolution is considered faulty?

Accepted Answer

D. Changes that result in individuals of the same species are transmitted to offspring

Answer

A. Individuals of the same species growing under different environmental conditions differ from each other

Answer

B. Use of certain organs result in development of those parts

Answer

C. Unused organs degenerate

Question 53

The testes in male mammals descend into the scrotal sac because

Accepted Answer

D. they require a relatively low temperature

Answer

A. there is congestion in the lower abdomen

Answer

B. they run the risk of being destroyed

Answer

C. they need special support

Question 54

The process whereby electrons are emitted from chlorophyll and returned to it unchanged is known as?

Accepted Answer

D. cyclic photophorylatlion

Answer

A. non-cyclic phosphorylation

Answer

B. photochemical reaction

Answer

C. photophorylation

Question 55

Which of the following statements best describes haemoglobin? It is

Accepted Answer

C. an oxygen carrying pigment

Answer

A. yellowish in colour

Answer

B. a red blood cell

Answer

D. needed for blood clotting

Question 56

Secondary growth is brought about by the activities of the

Accepted Answer

D. vascular cambium and phellogen

Answer

A. phellogen and phelloderm

Answer

B. phellogen and procambium.

Answer

C. vascular cambium and phelloderm

Question 57

What is the probability? of a man of blood group AB married to a woman of blood group O producing a child of blood group O?

Accepted Answer

A. 0%

Answer

B. 25%

Answer

C. 50%

Answer

D. 75%

Question 58

A xerophyte conserves water by possession of the following features except

Accepted Answer

C. broad leaves

Answer

A. thick cuticle

Answer

B. sunken stomata

Answer

D. fleshy stem

2011 WAEC (WASSCE) Biology Past Questions

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