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BIOLOGY (Objective Questions And Answers)


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THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2005

Objectives



1. Which of the following groups embraces the rest?

A. Class

B. Kingdom

C. Phylum

D. Species


2. The group mollusca is characterized by the presence of

A. Jointed appendages

B. Star-shaped bodies.

C. Backbones

D. Soft, non-segmented bodies


3. A virus can sometimes be regarded as a living organism because it

A. Causes disease in plants and animals.

B. Exists in a variety of shapes

C. Reproduces in living cells

D. Is easily visible with the aid of an electron microscope.


4. A major difference between plants and animals is that

A. There is free movement in animals while this is limited in plants

B. There is indefinite growth in animals only

C. Animals consume inorgan materials as food, while plants consume organic materials.

D. Animals give up carbon-dioxide as a waste product of respiration while plants do not.


5. Which of the following adaptation is not found in fruits and seeds dispersed by the wind?

A. Small and light body

B. Spongy coats

C. Turfs of hairs

D. Wings on pericarp


ANSWERS

6. The main similarity between unicellular and multicellular organisms is that both

A. Perform all life activities

B. Exist as filaments

C. Are plants

D. Exist as colonies


7. One important characteristic of green plants is that they

A. Possess specialized sense organs

B. Are usually motile

C Are autotrophic

D. Respond slowly to stimuli


8. A serious disadvantage of complexity in higher organisms is

A. A high demand for food and energy

B. Ability to function in many specialized roles

C. Little amount of energy dissipated in functioning

D. Specialization of parts of the body.


9. Which of these organs can be considered vestigial in humans but functional in other mammals? The

A. Liver

B. Appendix

C. Rectum

D. Stomach


10. Which of the following pairs of organisms are photosynthetic?

A. Amoeba and Paramecium

B. Volvox and Rhizopus

C. Chlamydomonas and Euglena

D. Nostoc and Plasmodium


ANSWERS

11. Which of the following pairs of organisms exists as colonies?

A. Obelia and Euglena

B. Pandorina and Volvox

C. Chlamydomonas and Amoeba

D. Hydra and Spirogyra


12. Which of the following best explains why it is difficult to see clearly in dim light?

A. Initially the eye cannot operate when the light is dim

B. The choroid reflect all the light that enters the eye

C. Too little light reaches the retina and so the cones may not be stimulated at all

D. Dim light causes the pupil to close up so that not much light enters the eye.


13. In active transport, molecules move against a concentration gradient, therefore,

A. Molecules move from a region of low concentration to a region of high concentration

B. Molecules move from a region of high concentration to a region of low concentration

C. The concentration gradient has little effect on the movement of molecules

D. Molecules force their way through special channels


14. Which of the following substances pass through the root cell membrane by osmosis?

A. Cell sap

B. Carbon dioxide

C. Oxygen

D. Water


15 Which of the following statements defines plasmolysis?

A. Shrinking of a plant cell in a solution

B. Shrinking away of cytoplasm from an animal cell membrane

C. Shrinking away of the cytoplasm from the plant cell wall

D. Shrinking of the vacuole and leaving the cytoplasm attached to the cell wall.


ANSWERS

16. Raw materials required by green plants to manufacture their food are

A. Mainly fluids

B. Inorganic Substance

C. Living materials

D. Mainly


17. The role of ATP include all the following activities except

A. Provision of energy to do work in living organisms .

B. Transmission of nerve impulse

C. keeping the body warm in homoeothermic animals

D. producing water during aerobic respiration.


18 The basis of growth involves the following processes except

A. Cell reduction

B. Cell division

C. Cell differentiation

D. Cell enlarge


19. Which of the following statements is true about movement of the forearm? In

A. Bending the arm, the biceps relax and the triceps contract

B. Bending the arm, the biceps contract and the triceps relax

C. Straightening the arm the biceps contract and triceps relax

D. Straightening the arm, both biceps and triceps contract


20. Only specially adapted micro-organisms are found in

A. Salty water

B. Humid air

C. Moist soil

D. Mouth cavities.


ANSWERS

21. Which of the following organism causes syphilis?

A. Mycobacterium tuberculosis

B. Bordetella pertusis

C. Treponema pallidum

D. Clostridium tetani


22. In plants, respiration occurs in

A. Mesophyll cells only

B. The root only

C. The stomata and lenticel only

D. All living cells.


23 A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one, indicates that

A. Sunlight slows down water loss from the upper surface.

B. The lower surface of the leaf has more stomata

C. Sunlight causes the stomata on the upper surface to close

D. Stomata are not present on the upper surface of a


24. Which of the following takes place when a person's temperature rises above 37°C?

A. Sweating and vasoconstriction

B. Panting and vasoconstriction

C. Sweating and vasodilatation

D. Panting and vasodilatation.


25. Which of the following glands secretes a substance into the blood stream of a frightened person?

A. Adrenal glands

B. Salivary glands

C. Gastric glands

D. Parathyroid


ANSWERS

26. Reading the verdict of a case by a judge or magistrate is example of

A. A reflex action

B. An instinct

C. A conditioned reflex

D. A voluntary action


27. Which of the following describes an example of fertilization in higher organisms?

A. Fusion of sperm and egg nuclei

B. Ejaculating of sperm into a female body

C. Male gametes germinating in the pollen tude

D. A pollen grain landing on a sticky stigma.


28. When both ovaries of the human female ovulate simultaneously and both ova are fertilized, then

A. Identical twins are produced

B. Fraternal twins are produced

C. Siamese twins are produced

D. The children produced are genetically identical.


29. Which of the following statement is not the true of the light stage of photosynthesis? A. Chlrophyll is energized by sunlight

B. Water molecules split into hydrogen and hydroxyl ions

C. Carbon (IV) oxide is reduced by hydrogen atoms in NADPH

D. Waters is formed.


30. Which of the following elements is required in large by plants?

A. Molybdenum

B. Boron

C. Copper

D. Phosphorus


ANSWERS

31. Which of the following substances has the highest of amount energy in joules per unit weight?

A. Carbohydrates

B. Proteins

C. Fats

D. Vitamins


32. Which of the following juices contains the enzyme ptyalin?

A. Gastric juice

B. Pancreatic juice

C. Succus

D. Saliva


33. Trees in savannah habitats usually have heavy thick bark which mainly

A. Reduces the rate of transpiration

B. Protect them from scorching sun

C. Protect them from heavy winds

D. Resist bush fires.


34. In the marine food webs, the source of energy to the producer comes from

A. See waves

B. Sea water

C. Sun

D. Air


35. A population is best described as

A. A group of the same species of organisms living together

B. A group of animals and plants living together

C. A group of insects and grasses

D. Different species of wild animals.


ANSWERS

36. Possession of strong adhesives is a feature of animals living in/on

A. Sandy beaches

B. Rocky shores

C. Benthic zones

D. Deserts


37. Self sustaining environment produced by an interaction between the biotic and abiotic components is best described as

A. A niche

B. A community

C. An ecosystem

D. A habitat


38. Which of the following factors is not associated with aquatic habitats ?

A. Salinity

B. Turbidity

C. Temperature

D. Edaphic


39. Which of the following instruments is used to measure the speed of a stream?

A. Simple float

B. Secchi disc

C. Quadrate a drat frame

D. Rain guage


40. In an ecosystem the organism which changes light energy stored chemical energy is the

A. Consumer

B. Decomposer

C. Producer

D. Carnivore


ANSWERS

41. Which of the following processes does not contribute to the maintenance of the nitrogen content of the soil?

A. Decomposition

B. Denitrification

C. Nitrification

D. Nitrogen fixation


42. Which of the following organisms is well adapted for fluid feeding?

A. Cockroach

B. Mosquito

C. Grasshopper

D. Ants


43. The density-dependent factors that operate to regulate a population size may include the following except

A. Shortage of food supply

B. Fire outbreak

C. Spread of diseases

D. Increased competition


44. Which of the following infections is unlikely to respond to antibiotic treatment?

A. Typhoid fever

B. Ring worm

C. Measles

D. Tetanus


45. Algal bloom depletes oxygen content of bodies of water polluted by

A. Industrial effluents

B. Thermal plant discharge

C. Sewage disposal

D. Crude oil spillage


ANSWERS

46. Conservation of wild life is necessary mainly because

A. Wild species cannot resist disease better than their domesticated species

B. Many predator wild animals help in control of pests

C. Many people derive pleasure from observing wild animals

D. It helps to prevent extinction of species


47. Which of the following is not a means of conservation?

A. Controlling excessive deforestation

B. Prevention of poaching

C. Replacing harvested mature trees with seedlings

D. Burning of vegetation before cropping


48. Which of the following statements about mutation is true?

A. The genotype is not affected

B. The genotype is affected.

C. The phenotype is not affected

D. It cannot be induced by artificial means.


49. Variation which exhibits a wide range from one extreme to the other with very little difference between the intermedi-ates is described as

A. Phenotypic

B. Discontinuous

C. Continuous

D. Genotypic


50. Which of the following is an example of physilogical variation?

A. Blood groups

B. Skin colour

C. Finger prints

D. Human height


ANSWERS

51. A person with blood group B can only donate blood to individuals with blood groups

A. A and

B B. B and AB

C. O only

D. B only


52. If the pink colour of a petal is dominant over white what would be the colour of the flower of the F1 generation when a pure pink flowered plant is crossed with a white flowered plant?

A. Purple

B. Pink

C. White

D. Yellow


53. If two parents are sickle cell carriers then tfieir genotypes would be

A. HbA HbA and HbS HbS

B. HbS HbS and HbS HbS

C. HbA HbS and HbA HbS

D. HbA HbA and HbA HbA


54. Which disease is sex-linked and mainly afflicts male offspring?

A. Sickle cell anaemia

B. Haemophilia

C. Diabetes

D. Malaria


55. In a living cell, factors which are responsible for inheritance are located

A. On the nuclear membrane

B. On the nucleolus

C. On the chromosomes

D. In the nucleoplasm


ANSWERS

56. Which of the following is not a correct base pairing on the DNA strand?

A. Adenine, Thymine

B. Cytosine, Guanine

C. Guanin, Cytosine

D Uracil, Thymine


57. Which of the following organisms is a social insect?

A. Grasshopper

B. Honey bee

C. Butterfly

D. Housefly


58. Territoriality is a phenomenon among.

A. Lower organisms

B. Plants of different species

C. Male animals with a group of females

D. Animals and plants.


59. A honey bee worker communicates with others on locating a source of food by

A. Dancing

B. Stinging

C. Instinct

D. Flares.


60. Which of the following is not an evidence of evolution?

A. Fossil records

B. Comparative embryology

C. Polymorphism

D. Comparative anatomy.



WASSCE JUNE 2005 BIOLOGY

OBJECTIVE TEST ANSWERS

1. B 2. D 3. C 4.A 5. B 6. A 7.C 8. A 9. B 10. C

11. B 12. C 13. B 14. D 15. C 16.B 17. D 18. A 19. B 20. A

21. C 22. D 23. B 24.C 25. A 26. D 27. A 28. B 29. C 30. D

31. C 32 D 33. D 34. C 35. A 36. B 37. C 38. D 39. A 40.C

41. B 42. B 43. B 44. D 45. A 46. D 47. D 48.B 49. C 50. A

51. B 52. B 53. C 54. B 55. C 56.D 57. B 58. C 59. A 60. C


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