Section A — 1 Mark Questions
1. Define environmental health. [1 Mark]
Answer: Environmental health is the branch of public health concerned with all aspects of the natural and built environment that affect human health.
2. State one major determinant of environmental health. [1 Mark]
Answer: Access to clean drinking water.
3. What is an occupational health hazard? [1 Mark]
Answer: It is any factor in the workplace that can cause injury, illness, or disease to employees.
4. Identify one primary air pollutant. [1 Mark]
Answer: Carbon monoxide.
5. Name one respiratory disease caused by air pollution. [1 Mark]
Answer: Asthma.
6. What is the main source of water pollution related to agriculture? [1 Mark]
Answer: Runoff containing pesticides and fertilizers.
7. State the unit used to measure noise pollution. [1 Mark]
Answer: Decibels (dB).
8. What is the primary health risk associated with long-term exposure to high noise levels? [1 Mark]
Answer: Hearing loss or impairment.
9. Define land pollution. [1 Mark]
Answer: Land pollution is the degradation of the Earth's surface caused by human activities and the misuse of land resources.
10. What is a common psychological stressor in modern society? [1 Mark]
Answer: Work-related pressure.
11. Define depression. [1 Mark]
Answer: Depression is a mood disorder characterized by persistent feelings of sadness and loss of interest.
12. State one benefit of yoga for mental health. [1 Mark]
Answer: It helps in reducing cortisol levels.
13. What is a physical symptom of psychological stress? [1 Mark]
Answer: Headaches or muscle tension.
14. How does water pollution affect health? [1 Mark]
Answer: It causes waterborne diseases like cholera and typhoid.
15. Name one pollutant found in industrial waste. [1 Mark]
Answer: Heavy metals like lead or mercury.
16. What is the role of the environment in health? [1 Mark]
Answer: It provides the resources needed for life and can also act as a source of disease exposure.
17. Define occupational stress. [1 Mark]
Answer: Stress resulting from the demands and pressures of the workplace.
18. What does the term 'built environment' refer to? [1 Mark]
Answer: Man-made surroundings that provide the setting for human activity.
19. How can noise pollution affect sleep? [1 Mark]
Answer: It causes sleep disturbance and insomnia.
20. Why is yoga considered a holistic approach to stress management? [1 Mark]
Answer: It integrates physical postures, breathing exercises, and meditation to calm the mind and body.
Section B — 2/3 Mark Questions
1. Differentiate between physical and biological environmental hazards. [2 Marks]
Answer: Physical hazards include factors like noise, radiation, and extreme temperatures, whereas biological hazards involve living organisms such as bacteria, viruses, and parasites that can cause disease.
2. List three major health impacts of air pollution on human health. [3 Marks]
Answer: 1. Reduced lung function. 2. Increased risk of cardiovascular diseases. 3. Irritation of the eyes, nose, and throat.
3. Briefly explain how industrial waste contributes to land pollution. [2 Marks]
Answer: Industrial waste contains toxic chemicals and heavy metals. When disposed of improperly on land, these substances leach into the soil, poisoning plants and contaminating groundwater sources.
4. What are the primary symptoms of depressive disorders? [3 Marks]
Answer: 1. Persistent sadness or low mood. 2. Loss of interest in daily activities (anhedonia). 3. Significant changes in appetite, sleep patterns, and energy levels.
5. How does noise pollution affect the nervous system? [2 Marks]
Answer: Chronic exposure to loud noise triggers the release of stress hormones like adrenaline, which can lead to anxiety, irritability, and hypertension.
6. Explain two ways in which yoga assists in stress reduction. [2 Marks]
Answer: 1. It promotes deep, rhythmic breathing which activates the parasympathetic nervous system. 2. It encourages mindfulness, helping individuals detach from ruminative thoughts.
7. Describe the link between environmental pollution and waterborne diseases. [3 Marks]
Answer: Pollution, such as sewage discharge, introduces pathogens into water bodies. When this contaminated water is consumed or used for daily needs, it leads to the spread of infectious diseases like diarrhea, cholera, and dysentery.
8. What are the key determinants of a healthy occupational environment? [3 Marks]
Answer: 1. Adequate ventilation and lighting. 2. Ergonomically designed workspaces. 3. Safety protocols to prevent exposure to hazardous chemicals or loud noise.
9. Why is stress considered a significant factor in modern health? [2 Marks]
Answer: Unmanaged chronic stress weakens the immune system and increases the risk of both mental health disorders like depression and physical ailments like heart disease.
10. Suggest two measures to control land pollution. [2 Marks]
Answer: 1. Proper waste management through segregation and recycling. 2. Reducing the use of non-biodegradable materials such as single-use plastics.
Section C — 5 Mark Questions
1. Explain the major environmental pollutants and their associated health hazards. [5 Marks]
Answer:
Introduction
Environmental pollution involves the introduction of harmful contaminants into the natural environment, which leads to adverse health outcomes.
Main Pollutants and Hazards
- Air Pollution: Caused by particulates, sulfur dioxide, and nitrogen oxides. It leads to chronic respiratory diseases, heart attacks, and lung cancer.
- Water Pollution: Caused by industrial effluents, sewage, and agricultural runoff. It results in waterborne diseases such as cholera, hepatitis A, and skin infections.
- Land Pollution: Caused by solid waste, pesticides, and heavy metals. These chemicals contaminate the food chain, leading to long-term toxicity and organ damage in humans.
- Noise Pollution: Caused by industrial, traffic, and urban noise. It leads to stress, sleep deprivation, and permanent hearing loss.
Conclusion: Addressing these pollutants requires a combination of strict industrial regulation and individual awareness to safeguard public health.
2. Discuss the determinants of environmental health in detail. [5 Marks]
Answer:
Introduction
Environmental health is determined by the complex interplay between the natural, social, and built environments.
Key Determinants
- Access to Clean Water and Sanitation: A fundamental determinant that prevents the spread of infectious diseases and supports basic hygiene.
- Air Quality: The presence of clean air is essential for respiratory health; poor quality due to emissions is a major health threat.
- Housing and Shelter: Proper ventilation, overcrowding control, and protection from elements are vital for preventing the spread of diseases and mental wellbeing.
- Chemical Safety: Control of hazardous chemicals in food, air, and water is crucial for preventing chronic poisoning.
- Workplace Conditions: Occupational factors such as safety gear, toxic exposure limits, and ergonomic design directly influence the health of the workforce.
Conclusion: Improving these determinants is essential for sustainable development and the prevention of both communicable and non-communicable diseases.
3. Elaborate on the relationship between psychological stress and depressive disorders. [5 Marks]
Answer:
Introduction
Stress is the body's natural response to environmental demands, but chronic exposure can lead to severe mental health conditions.
Explanation
When an individual is under constant stress, the body releases high levels of cortisol. If this continues, the brain's ability to regulate mood is compromised.
Key Points
- Biological Link: Prolonged activation of the 'fight or flight' mechanism depletes neurotransmitters like serotonin, which are linked to mood stability.
- Psychological Impact: Constant pressure leads to a sense of helplessness, which is a primary trigger for the onset of major depressive episodes.
- Behavioral Changes: Stress often causes social withdrawal and sleep disturbances, which are also classic symptoms that exacerbate depression.
Conclusion: Recognizing the signs of chronic stress early is critical in preventing the progression toward clinical depression.
4. Describe the role of yoga in stress management and mental well-being. [5 Marks]
Answer:
Introduction
Yoga is a multi-dimensional practice that combines physical poses, controlled breathing, and meditative techniques to enhance mental equilibrium.
Mechanism of Action
- Regulation of Nervous System: Deep breathing techniques (Pranayama) shift the body from the sympathetic (stress) to the parasympathetic (relaxation) mode.
- Physical Benefits: Performing asanas (poses) releases muscular tension built up due to stress, reducing physical pain that often accompanies mental fatigue.
- Mindfulness: The practice encourages staying in the present moment, which helps reduce anxiety about the future and regret regarding the past.
- Hormonal Balance: Regular practice is shown to reduce cortisol, the primary stress hormone, leading to improved mood and stability.
Conclusion: Yoga serves as an effective, non-pharmacological tool for long-term stress management, improving overall quality of life.
5. Elaborate on the various occupational health and safety concerns. [5 Marks]
Answer:
Introduction
Occupational health focuses on the physical and mental well-being of employees within their workplace environment.
Key Concerns
- Physical Hazards: These include heavy machinery, noise, lighting, and temperature extremes that can lead to acute injuries or chronic health issues.
- Chemical Hazards: Exposure to toxic chemicals, vapors, or dust in factories can result in long-term respiratory problems and skin conditions.
- Ergonomic Hazards: Poor workstation design leads to musculoskeletal disorders like back pain, repetitive strain injuries, and carpal tunnel syndrome.
- Psychosocial Hazards: Excessive workload, lack of control, and lack of support lead to occupational stress and burnout.
- Biological Hazards: In specific sectors like healthcare, exposure to viruses and pathogens remains a constant risk.
Conclusion: Effective occupational safety requires hazard identification, regular risk assessment, and the implementation of protective measures to ensure a healthy working environment.