Week 12: First Term Examination

Subject: Basic Science

Class: JSS 3

Term: First Term

Week: 12

Topic: First Term Examination

Instructions for the Examination

1. Answer all questions in every section of the exam.
2. Do not cheat or copy from others.
3. Keep quiet during the exam.
4. Ask for help by raising your hand if you have a question.
5. Write clearly and neatly in your answer booklet.
6. Submit your paper on time.
7. Do your best and avoid stress.

Examination Structure

• Part A: 30 Multiple-Choice Questions (Objective)
• Part B: 20 Short-Answer Questions (Theory)
• Part C: 10 True/False Questions

Part A: Objective Questions (30 Questions)

Choose the correct option (a, b, c, or d) for each question.

1. __________ is the uncontrolled cutting down of trees.
   a) Afforestation
   b) Reforestation
   c) Deforestation
   d) Irrigation
2. Which of these gases harms the ozone layer?
   a) Oxygen
   b) Chlorofluorocarbon (CFC)
   c) Nitrogen
   d) Carbon dioxide
3. A person with very light skin and hair may have __________.
   a) Albinism
   b) Dwarfism
   c) Obesity
   d) Asthma
4. The most common cause of soil erosion is __________.
   a) Rainfall and wind
   b) Air pollution
   c) Fertilizers
   d) Deforestation
5. __________ occurs when animals eat too much vegetation from one area.
   a) Irrigation
   b) Overgrazing
   c) Reforestation
   d) Crop rotation
6. __________ is the protective layer that absorbs ultraviolet radiation.
   a) Ozone layer
   b) Atmosphere
   c) Mesosphere
   d) Greenhouse
7. Which of these is a family trait?
   a) Height
   b) Favorite food
   c) School uniform
   d) Hobbies
8. Bush burning can lead to __________.
   a) Better farming
   b) Infertile soil
   c) More rainfall
   d) Cleaner air
9. __________ means planting trees to replace cut-down ones.
   a) Irrigation
   b) Reforestation
   c) Deforestation
   d) Overgrazing
10. Flooding happens when water __________.
    a) Soaks into the soil quickly
    b) Cannot flow away properly
    c) Is stopped by plants
    d) Falls as mist
11. __________ is a major effect of deforestation.
    a) Improved farming
    b) Soil erosion
    c) Lower temperatures
    d) Air purification
12. Which of these gases causes global warming?
    a) Helium
    b) Carbon dioxide
    c) Chlorine
    d) Oxygen
13. A __________ trait will always show, even if only one parent has it.
    a) Recessive
    b) Dominant
    c) Neutral
    d) Temporary
14. Bush burning can cause __________.
    a) Economic loss
    b) Soil improvement
    c) More trees
    d) Better roads
15. Which of these is a control measure for soil erosion?
    a) Leaving the soil bare
    b) Planting cover crops
    c) Using heavy machines
    d) Removing all plants
16. The effect of global warming includes __________.
    a) Reduced rainfall
    b) Melting of ice caps
    c) Cleaner air
    d) Thicker atmosphere
17. Desertification means __________.
    a) Turning farmland into forests
    b) Land becoming dry and barren
    c) Heavy rainfall over farmland
    d) Earthquakes in deserts
18. One way to prevent deforestation is __________.
    a) Cutting all trees
    b) Replanting trees
    c) Burning bushes
    d) Removing forest animals
19. The layer of air that contains the ozone is the __________.
    a) Stratosphere
    b) Troposphere
    c) Mesosphere
    d) Thermosphere
20. Which of these gases destroys the ozone layer?
    a) Nitrogen
    b) Methane
    c) CFCs
    d) Helium
21. Flooding can affect __________.
    a) Farmland and communities
    b) Only large rivers
    c) Air temperature
    d) Wind direction
22. __________ helps prevent soil erosion.
    a) Building terraces
    b) Burning forests
    c) Grazing animals
    d) Cutting down trees
23. A trait passed down from parents to children is called __________.
    a) Intelligence
    b) Favorite sport
    c) School uniform
    d) Dream job
24. Chlorofluorocarbons (CFCs) are found in __________.
    a) Refrigerators and air conditioners
    b) Solar panels
    c) Water taps
    d) Farming tools
25. The greenhouse effect is caused by __________ gases.
    a) Oxygen
    b) Greenhouse
    c) Hydrogen
    d) Nitrogen
26. Overgrazing leads to __________.
    a) Healthier plants
    b) Soil erosion
    c) Cleaner water
    d) More animals
27. __________ prevents the harmful effects of UV rays.
    a) The ozone layer
    b) Rainfall
    c) Global warming
    d) Soil erosion
28. A __________ trait will only appear if both parents have it.
    a) Dominant
    b) Recessive
    c) Neutral
    d) Random
29. The main cause of bush burning is __________.
    a) Clearing farmland
    b) Planting trees
    c) Reducing erosion
    d) Building terraces
30. __________ is one way to reduce desertification.
    a) Overgrazing
    b) Afforestation
    c) Bush burning
    d) Draining rivers

Part B: Short-Answer Theory Questions (20 Questions)

1. Define deforestation and explain its impact on the environment.
2. What is the role of the ozone layer in protecting life on Earth?
3. Explain how global warming affects the environment.
4. List two ways to prevent soil erosion.
5. Describe what bush burning is and give one reason people do it.
6. What is desertification?
7. How does afforestation help fight environmental problems?
8. Give one example of a family trait.
9. Explain how overgrazing causes desertification.
10. Mention one gas responsible for ozone layer depletion.
11. What is the greenhouse effect?
12. How does flooding affect farmland?
13. Describe the difference between dominant and recessive traits.
14. Why is intelligence considered a family trait?
15. List one regulation to control bush burning.
16. What are the effects of CFCs on the ozone layer?
17. How can students help prevent global warming?
18. Mention two causes of flooding.
19. Explain how terraces help control soil erosion.
20. What is one consequence of deforestation on animals?

Part C: True or False Questions (10 Questions)

1. The ozone layer absorbs harmful ultraviolet rays.
   • True
2. Overgrazing makes soil more fertile.
   • False
3. Flooding only happens during the rainy season.
   • False
4. Global warming causes the melting of ice caps.
   • True
5. Burning bushes helps prevent soil erosion.
   • False
6. A dominant trait is always expressed if one parent has it.
   • True
7. Intelligence is an example of a family trait.
   • True
8. Afforestation involves planting new trees.
   • True
9. CFCs are good for the ozone layer.
   • False
10. Deforestation helps improve air quality.

• False

Conclusion

The teacher will collect all answer sheets, mark them, and provide feedback to students. Students should review the results to understand areas that need improvement.