First Term Examination
Class : JSS 3
Subject: Basic Science
Duration :
Instruction: Answer all questions.
Section A : Objective Questions
Read the question carefully and pick from the options lettered (a – d), the best that is suitable.
1. The sum total of gene inherited from parent to offspring is called ___________. (a) Phenotype (b) Chromosome (c) Genotype (d) Cell formation
2. In sex determination the first 22 parts are called __________ chromosomes. (a) Somatic (b) Real (c) Fertilized (d) Somatatic
3. __________ occur when the too soil is removed evenly over an area by rain water. (a) Sheet erosion (b) Rill erosion (c) Gully erosion (d) Suspension erosion
4. Herbivores animal feed on _____________. (a) Decayed matter (b) Sewage material (c) Plant only (d) Flesh only
5. The respiratory organ in plant is the _______. (a) Flower (b) Stem (c) Bud (d) Stomata
6. Cochlea nerve is found in the ___________ (a) Ear (b) Eye (c) Mouth (d) Nose
7. Ultraviolet radiation from the sun converts some oxygen molecule to _________________. ( a) Ozone (b) Photosynthesis (c) Erosion (d) Channelization
8. If an (AS) man marries an (AS) woman, the ratio for the four offspring normal, carrier and sickle cell will be ____________. (a) 1:2:1 (b) 1:1:2 (c) 1:3:1 (d) 2:1:1
9. All except one is not method of preventing deforestation. (a) Reafforestation (b) Afforestation (c) Legislation (d) Channelization
10. Which of the gland is also refers to as MASTER GLAND? (a) Thyroid (b) Glandular (c) Sweat gland (d) Pituitary gland
11. The symbol for sodium is represented as _______. (a) Si (b) Ca (c) Na (d) Mg
12. All except one is not method of preventing erosion. (a) Mulching (b) Deforestation (c) Strip cropping (d) Terracing of slopes
14. ____________ occurs as a result of the abnormal build up of carbon(iv) oxide in the atmosphere. (a) Global warming (b) Afforestation (c) Bush burning (d) Global melting
15. Unwanted material in our environment is called _________. (a) Sanitation (b) Sewage (c) Waste (d) Landmass
16. A boy of mass 20kg stands on a building floor 12m above the ground level. Calculate his potential energy. (g = 10m/s2). (a) 2400 (b) 40 (c) 188 (d) 250
17. The Ozone layer is located in the lower ___________. (a) Hydrosphere (b) Ionsphere (c) Stratosphere (d) Troposphere
18. Microphone changes ___________ energy to ___________. (a) Sound to electrical (b) Light to sound (c) Electrical to sound (d) Heat to electrical
19. Calculate the power required to lift 200kg of water through a vertical height of 6m in 2seconds. (take g=10m/s2) (a) 218W (b) 260W (c) 6000W (d) 1200W
20. The under secretion (insufficient secretion) if the thyroid hormone in children which cause growth abnormality is referred to as ___________. (a) Gigantism (b) Goiter (c) Getinism (d) Dwarfism
21. Which of these symbols represent Ozone? (a) O (b) O2 (c) O3 (d) O4
22. Organism that feeds on decayed matter are called _____________________. (a) omnivores (b) carnivores (c) saprophytes (d) herbivores
23. The type of relationship whereby the large organisms feeds on the smaller organism in an ecosystem is called ____________. (a) parasitic (b) predators and preys (c) saprophytism (d) commensalism
24. Petrol is used in generator to give light. What energy changes took place in the process? (a) Heat to Light (b) Chemical to Electrical (c) Sound to Electrical (d) Nuclear to Light
25. The act of cutting down trees from the forest is known as __________________. (a) Afforestation (b) desertification (c) deforestation (d) devastation
26. In a neutral atom ____________________. (a) The number of neuron is equal to the number of electron (b) The number of neutron is equal to the number of proton (c) The number of proton is equal to the number of electron (d) The number of proton is greater than the number of electron.
27. When atom gains electron it becomes _________. (a) a positive ion (b) a negative ion (c) a neural ion (d) a neutral atom
28. __________ are positively charged atomic particles found in the nucleus of atoms. (a) Protons (b) Electrons (c) Neutrons (d) Ion
29. What is the chemical formula of Trioxonitrate (v) acid? (a) H2SO4 (b) HCl (c) HNO3 (d) H2CO3
30. The Central nervous system consist of _________. (a) Auditory nerves and brain (b) brain and limb (c) brain and spinal cord (d) nerves and limb
31. In the human brain, ________ is the seat of reasoning, memory and intelligence. (a) Cerebrum (b) Cerebellum (c) Medulla oblongata (d) Hypothalamus
32. The brain after interpretation of information sends out signals for appropriate action through __________. (a) sensory neurone (b) motor neurone (c) autonomic nervous system (d) Central nerve
33. The hormone responsible for the development of secondary sexual characteristics in males is secreted by ___________. (a) adrenal gland (b) pituitary gland (c) glands of the gonads (d) thyroid gland
34. The part of the eye where images are formed is called __________. (a) choroids layer (b) cornea (c) lens (d) retina
35. Short sightedness can be corrected by using ___________. (a) convex lens (b) concave lens (c) plain mirror (d) vertical lens
36. External ear of human being consists of ________. (a) pinna and auditory meatus (b) auditory nerve and semi- circular canal (c) ear ossicles and pinna (d) cochlear and ear ossicles
37. The outermost layer of the skin is called __________. (a) Dermis (b) Epidermis (c) Horny layer (d) Sebaceous gland
38. Objects that does not allow the passage of light through them are said to be __________. (a) Luminous (b) Opaque (c) Transparent (d) Translucent
39. ___________ is the bending of light rays as it passes from one medium to another. (c) Reflection (b) Refraction (c) Dispersion (d) Propagation
40. The balances chemical equation for for the reaction between nitrogen and oxygen to produce nutrogen(IV) oxide is _________. (a) N2 + O2 => 2NO (b) 2N2 + O2 => 2N2O (c) N2 + 2O2 => 2NO2 (d) N2 + O2 => 2NO2
Section B: Theory questions
Instruction : Answer all questions in this section.
1a. Define Living things.
1b. State the characteristics of living things
2a. What is family trait?
2b. Write short notes on the following:
i. Gene
ii. Chromosomes
iii. Dominant gene
iv. Recessive gene
3a. Define erosion
3b. State four causes of erosion.
4a. What is environmental hazard?
4b. State two causes of environmental hazard.