Possible WAEC objective test and answers for revision in elective biology.
Objective test for revision (elective biology)
1. Temporary slides prepared to be examined under the microscope are always covered with a cover slip in order to:
A. avoid breaking the slide B. make the object appear clearer.
C. prevent the object from falling. D. avoid wetting the objective lens.
2. A prepared slide to be observed under the microscope must be on the:
A. condenser B. Stage
B. diaphragm D. nose piece.
3. The factor being tested in an experiment is the:
A. Data B. Variable
B. Hypothesis D. Theory
4. A major difference between plant and animal 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 inorganic materials as food
D. animals give out carbon dioxide as waste product of respiration whiles plants do not
5. The main similarity between unicellular and multicellular organism is that both:
A. perform all life activities B. exists as filament
C. are plants D. exists as colony
6. All the following are examples of asexual reproduction except:
A. Conjugation B. Budding
C. spore formation D. Fragmentation
7. Which of the following parts of an organism is a tissue?
A. Blood of a mammal B. Flower of a plant
C. Leaf of a plant D. Neurone of a man.
8. The structure of the cell membrane is
A. double lipid layer and double protein layer.
B. middle bi–layer of protein with a lipid layer on either sides.
C. protein layer with two inner lipid layers
D. middle bi–layer of lipid with a protein layer on either sides.
9. Which of the following structures differentiate plant cell from an animal cell?
A. Ribosome B. Cell membrane
C. Chloroplast D. Mitochondria
10. Centrioles play specific role during division of the
A. ribosome B. nucleus C. mitochondrion D. chloroplast
11. The organelle of the cell usually referred to as the ‘power house’ is the
A. mitochondrion B. Golgi apparatus
C. endoplasmic reticulum D. ribosome
12. DNA formation is associated with
A. Golgi bodies B. Lysosomes
C. Mitochondria D. Nucleus
13. Which of the following plant cells can differentiate into other cell types?
A. Collenchyma B. Chlorenchyma
C. Parenchyma D. Sclerenchyma
14. When red blood cell is placed in distilled water for a long, the cell will:
A. burst B. increase in size
C. remain the same D. shrink
15. A cell is said to be plasmolysed if
A. it loses its water content and dries up
B. it imbibes water and swells up
C. the cytoplasm pulls away from the cell wall
D. the nuclear membrane raptures to release its content
16. Turgor pressure is essentially important because it:
A. is responsible for water storage in plants
B. keeps the plants cool
C. provides supports for the plant
D. prevents attack by pests
17. A student accidentally placed a fresh water fish into marine water. Which of the following responses is likely to be observed after about 48 hours?
A. the fish will become more energetic and swims faster
B. The fish would lose water from its body into the marine water.
C. Water will move into the fish’s body and makes it appear larger.
D. the fish would become more buoyant and float on the surface of the water body.
18. Which of the following resources is renewable?
A. Soil B. Air C. wild life D. Crude oil
19. Conservation of the ecosystem means
A. no destruction of animal species
B. elimination of harmful species
C. rational utilization of natural resources.
D. prohibition of the use of pesticides
20. In order to protect endangered species, it is important for countries to
A. export wildlife B. domesticate wildlife
C. conserve wildlife D. control wildlife export
21. When a substance is said to be biodegradable, it means
A. it is easily broken down by microorganisms
B. it is easily digested in the stomach
C. its effect persisted in the environment
D. it is a by-product of no biological importance.
22. Which of the following gases is a pollutant of the air?
A. Hydrogen sulphide B. Nitrogen
C. Water vapour D. Oxygen
23. Which of the following gases is hazardous to human even when present in minute quantity?
A. Carbon dioxide C. Hydrogen
C. Carbon monoxide D. Nitrogen
24. Hygienic condition refers to the one that tends to:
A. eliminate flies from the environment.
B. provides basic medical facilities
C. encourage the use of modern insecticide
D. promotes the health of individuals
25. Which of the following diseases is caused by a bacterium?
A. Ringworm B. Poliomyelitis
C. Malaria D. Syphilis
26. People who are fond of bathing in dirty water are likely to contract
A. trypanosomiasis B. onchocerciasis
C. elephantiasis D. schistosomiasis
27. Malaria and coccidiosis are both caused by:
A. Protozoa B. Fungus
C. Bacterium D. Virus
28. Self-medication should be avoided because
A. it makes the mind and body healthy.
B. it makes the individual addicted to drug.
C. individual may become over productive.
D. physicians are denied the chance of practice
29. In the formation of mRNA molecule, thymine is replaced by:
A. adenine B. cytosine
C. guanine D. Uracil
30. The pyrimidine bases found in DNA are:
A. adenine and guanine
B. adenine and cytosine
C. cytocine and guanine
D. cytosine and thymine
31. In protein synthesis, the anticodon of tRNA pairs with a comlimentary codon on the molecule of:
A. DNA B. mRNA C. RNA D. rRNA
32. Which of the following substances in not present in the DNA strand?
A. Phosphate B. Cytosine
C. Thymine D. Uracil
33. Meiosis takes place
A. during growth and development
B. during gamete formation
C. during asexual reproduction
D. in somatic cells
34. The haploid number of chromosomes in man is
A. 46 B. 42 C. 24 D. 23
35. A newly developed rice has a chromosome number of 12 in the zygote. What is its diploid chromosome number?
A. 6 B. 12 C. 18 D. 24
36. In flowering plants, meiosis is likely to take place in the:
A. leaf B. ovule C. root D. Stigma
37. The first stage in respiration is:
A. Krebs’ cycle B. Glycolysis C. Exhalation D. Aerobic
38. Which of the following is not true of a respiratory surface? It is
A. thick – walled B. well supplied with blood
C. permeable D. Moist
39. An apple plant can produce sexually and asexually. It has 40 chromosomes in its leaf cells. How many chromosome would be in each gamete and somatic cell?
A. 20 chromosome in the gamete and 10 in the somatic cell
B. 40 chromosome in the gamete and 20 in the somatic cell.
C. 20 chromosome in the gamete and 40 in the somatic cell
D. 40 chromosome in the gamete and 40 in the somatic cell
40. The fate of pyruvic acid in a cell depends mainly on the amount of:
A. hydrogen ions present B. respiratory enzymes present
C. oxygen present D. ATP present.
41. During glycolysis, a glucose molecule is split to produce two molecules of
A. succinic acid B. pyruvic acid
C. oxalo-acetic acid D. oxalic acid
42. Aestivation in mammals enables them to:
A. withstand drought B. regain energy
C. Undergo internal changes D. withstands cold.
43. Urine moves from the kidneys to the bladder through the
A. renal vein B. ureter
C. collecting duct D. urethra
44. Ultra filtration in the kidney takes place in the
A. renal vein B. Bowman’s capsule
C. Loop of Henle D. Medulla
45. Deamination of amino acids in the liver produces:
A. Blood sugar B. Glycogen
C. Bile D. Urea
46. In hot weather, the body can be cooled through
A. shivering B. vasoconstriction
C. hair standing on end D. relaxation of erector muscles
47. The function of the cervical vertebra is to:
A. allow the sliding movement
B. protect the heart and the lungs.
C. provide support to the skull.
D. provide surface for attachment of the thoracic muscles.
48. The safest method of birth control is
A. The use of intra-uterine device
B. The use of contraceptives
C. The regular intake of pills
D. The use of condoms
49. In human males and females, gametogenesis takes place respectively in
A. testis and womb
B. fallopian tube and testis
C. epididymis and ovary
D. testis and ovary
50. Which of the following is a secondary sexual characteristic in human females?
A. facial hair B. rounded hip
C. deep voice D. broad shoulder
ANSWERS:
- D. avoid wetting the objective lens.
- B. Stage
- B. Variable
- A. there is free movement in animals while this is limited in plants
- A. perform all life activities
- A. Conjugation
- A. Blood of a mammal
- D. middle bi–layer of lipid with a protein layer on either sides.
- C. Chloroplast
- B. nucleus
- A. mitochondrion
- D. Nucleus
- C. Parenchyma
- A. burst
- C. the cytoplasm pulls away from the cell wall
- C. provides supports for the plant
- B. The fish would lose water from its body into the marine water
- C. wild life
- C. rational utilization of natural resources.
- C. conserve wildlife
- A. it is easily broken down by microorganisms
- A. Hydrogen sulphide
- C. Carbon monoxide
- D. promotes the health of individuals
- D. Syphilis
- D. schistosomiasis
- A. Protozoa
- B. it makes the individual addicted to drug.
- D. Uracil
- D. cytosine and thymine
- B. mRNA
- D. Uracil
- B. during gamete formation
- D. 23
- B. 12
- B. 12
- B. Glycolysis
- A. thick – walled
- C. 20 chromosome in the gamete and 40 in the somatic cell
- C. oxygen present
- B. pyruvic acid
- A. withstand drought
- B. ureter
- B. Bowman’s capsule
- D. Urea
- D. relaxation of erector muscles
- C. provide support to the skull.
- D. The use of condoms
- D. testis and ovary
- B. rounded hip
About Author
