1. Biological control of malaria involves
A. draining breeding grounds of mosquitoes
B. spraying surfaces on which mosquitoes settle with insecticides
C. introducing fish into ponds to feed on larvae of mosquitoes
D. burying empty cans
2. A feeding association in which one partner benefits while the other loses is called
A. commercialism
B. mutualism
C. parasitism
D. symbiosis
3. The contraction of the biceps muscles in humans is likely to result in
A. straightening of the forearm
B. bending of the forearm
C. contraction of the triceps
D. movement of the scapula inwards towards the sternum
4. The role of oxygen in seed germination is to
A. provide energy for cell division and growth
B. soften the seed coat
C. dissolve the stored food
D. transport food substances to site of growth
5. Ectopic pregnancy in humans may result in
I. rupture of the fallopian tube
II. bleeding
III. weakness of the abdominal walls
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
6. One of the functions of the human vertebral column is to
A. enclose and protect the brain
B. form a hollow to accommodate the heart
C. hold the lungs in position
D. support the head
7. The function of the pancreatic juice in the digestive system of humans is to breakdown
I. starch to sugars
II. proteins to peptides
III. fats to fatty oils and glycerol
IV. peptides to amino acids
Which of the statements above are correct?
A. I and II only
B. III and IV only
C. I, II and III only
D. II, III and IV only
8. Grafting is a technique in crop production in which a
A. scion and a bud are joined together
B. scion and a root stick are joined together
C. stem and a root stick are joined together
D. stem and scion are joined together
9. Nerve impulses are carried into a nerve cell in humans by the
A. synapse
B. dendrite
C. mitochondrion
D. myelin sheath
10. Which of the following functions is/are associated with the endoplasmic reticulum of a living cell?
I. supports the ribosomes
II. provides large surface area for chemical reaction
III. provides mechanical support in the cytoplasm
A. I only
B. I and II only
C. II and III only
D. I, II and III
11. An organism used in the production of alcoholic beverages is
A. bacterium
B. protozoan
C. virus
D. yeast
12. Which of the following groups of characteristics in humans is classified as phenotype?
A. Eye colour and height
B. Eye colour and blood group
C. Height and sickle cell
D. Blood group and height
13. Which of the following plant seeds undergo hypogeal germination?
A. Cowpea
B. Flamboyant
C. Maize
D. Castor oils
14. The volumetric flask is used in the laboratory to
A. prepare standard solution
B. separate a mixture of immiscible liquids
C. carry out simple distillation
D. dry substances
15. Water is referred to as universal solvent because it
A. dissolves most substances
B. changes blue litmus solution to red
C. reacts with base to produce
D. has pH of 7
16. Alpha decay involves the emission of
A. electrons
B. neutrons
C. helium nuclei
D. gamma rays
17. Hydrolysis of fats and oils in the presence of a base results in the production of
A. soapy detergent and glycerol
B. soapless detergent and glycerol
C. soapy detergent and alcohol
D. soap and fatty acids
18. Radio isotopes ae used in
I. treatment of cancer
II. food preservation
III. pest control
IV. plant breeding
Which of the statements above are correct?
A. I, II and III only.
B. I, II and IV only
C. II, III and IV only
D. I, II, III and IV
19. Given that the Avogadro's constant is 6.02 × 1023, determine the number of atoms in 0.01 moles of a substance
A. 6.02 × 1020 atoms
B. 6.02 × 1021 atoms
C. 6.02 × 1023 atoms
D. 6.02 × 1024 atoms
20. An object is placed 150 cm in front of a vertical plane mirror. The image formed is
A. same size as the object
B. situated 150 cm from the object
C. real and erect
D. diminished
