Climate Change and Health Practice Questions

Q: Which of the following is a non-natural gas causing the greenhouse effect?

Hydrofluorocarbons. **Explanation:** The greenhouse effect is a natural process where certain gases trap heat in the earth's atmosphere, maintaining a temperature suitable for life. These gases are categorized into **natural** (occurring naturally in the environment) and **anthropogenic/synthetic** (man-made). **1. Why Hydrofluorocarbons (HFCs) is the Correct Answer:** HFCs are entirely **synthetic, man-made chemicals** primarily used in refrigeration, air conditioning, and foam blowing. Unlike CO2 or water vapor, they do not exist naturally in the atmosphere. While they were introduced to replace ozone-depleting substances (CFCs), they are potent greenhouse gases with a "Global Warming Potential" (GWP) thousands of times higher than CO2. **2. Analysis of Incorrect Options:** * **Carbon dioxide (CO2):** The most abundant natural greenhouse gas released through natural processes like respiration and volcanic eruptions (though significantly increased by human activity). * **Water vapor (H2O):** The most prevalent natural greenhouse gas. it acts as a feedback mechanism rather than a direct driver of climate change. * **Ozone (O3):** Found naturally in the stratosphere (protects from UV rays) and the troposphere (acts as a greenhouse gas). It is formed by natural photochemical reactions. **3. High-Yield Clinical Pearls for NEET-PG:** * **Kyoto Protocol:** An international treaty aimed at reducing the emission of six specific greenhouse gases: CO2, Methane (CH4), Nitrous Oxide (N2O), HFCs, PFCs, and Sulphur Hexafluoride (SF6). * **Global Warming Potential (GWP):** CO2 is the reference gas (GWP = 1). SF6 has the highest GWP among common gases. * **Health Impact:** Global warming expands the geographical range of **vector-borne diseases** (e.g., Malaria, Dengue) and increases the frequency of heat-related illnesses and respiratory conditions due to increased ground-level ozone.

Q: Which of the following is/are the greatest contributor(s) to global warming as a consequence of human activities and lifestyle?

Carbon dioxide. **Explanation:** The Greenhouse Effect is the process by which certain gases trap heat in the Earth's atmosphere, leading to **Global Warming**. While several gases contribute to this phenomenon, their impact is measured by their concentration and atmospheric lifetime. **Why Carbon Dioxide (CO₂) is the Correct Answer:** CO₂ is the single largest contributor to global warming, accounting for approximately **60% of the greenhouse effect** resulting from human activities. Its primary sources include the burning of fossil fuels (coal, oil, and natural gas), deforestation, and industrial processes. Although other gases may have a higher "Global Warming Potential" (GWP) per molecule, the sheer volume of CO₂ emissions makes it the dominant driver of climate change. **Analysis of Incorrect Options:** * **Methane (CH₄):** The second largest contributor (~15-20%). It is more potent than CO₂ but exists in much lower concentrations. Sources include livestock, rice cultivation, and landfills. * **Chlorofluorocarbons (CFCs):** These are highly potent but contribute less to the overall volume (~12%). Their primary clinical significance is **Ozone Layer Depletion**, leading to increased UV radiation and skin cancers (Basal/Squamous cell carcinoma and Melanoma). * **Ozone (O₃):** While tropospheric (ground-level) ozone acts as a greenhouse gas, its contribution is significantly lower than CO₂. **High-Yield NEET-PG Pearls:** 1. **Kyoto Protocol:** An international treaty aimed at reducing greenhouse gas emissions. 2. **Health Impacts:** Global warming expands the geographical range of **vector-borne diseases** (e.g., Malaria, Dengue) to higher altitudes and latitudes. 3. **Order of Contribution:** CO₂ (60%) > CH₄ (20%) > CFCs (12%) > Nitrous Oxide (6%).

Q: Which of the following is a direct health impact of climate change?

Heat-related illnesses. ***Heat-related illnesses*** - Heat-related illnesses such as **heat stroke, heat exhaustion, and heat cramps** are direct health impacts of climate change resulting from increased frequency and intensity of **heat waves**. - Rising global temperatures directly increase the risk of **hyperthermia**, particularly among vulnerable populations including the elderly, children, outdoor workers, and those with chronic diseases. - This is considered a **primary direct health impact** as it results immediately from temperature changes without intermediate pathways. *Increased vector-borne diseases* - While vector-borne diseases (malaria, dengue, chikungunya) do increase with climate change due to expanded geographic range and breeding seasons of vectors, this is considered an **indirect health impact**. - Climate change affects vector ecology through temperature, rainfall, and humidity changes, which then influences disease transmission - involving an intermediate biological pathway. *Food insecurity and malnutrition* - Food insecurity and malnutrition are significant health consequences of climate change but are classified as **indirect impacts**. - They result from climate change effects on **agricultural productivity**, crop yields, food distribution systems, and water availability - multiple intermediate pathways exist between climate change and the health outcome. *Injuries from extreme weather events* - While injuries and deaths from extreme weather events (floods, cyclones, droughts) are important health impacts of climate change, they are often categorized differently from heat-related illnesses. - Heat-related illnesses represent the most **direct physiological response** to the primary manifestation of climate change (rising temperatures), making it the best answer for a "direct" health impact.

Q: Which of the following gases is a significant contributor to the greenhouse effect?

All of the options. ***All of the options*** - All listed gases (CO2, Methane, and Sulfur hexafluoride) are recognized as significant **greenhouse gases**, contributing to the **greenhouse effect** and **climate change**. - While they differ in their **global warming potential** and atmospheric lifetimes, each plays a role in trapping heat in the Earth's atmosphere. *CO2* - **Carbon dioxide** is a major greenhouse gas, primarily from the burning of **fossil fuels** and deforestation. - It is often considered the most significant contributor due to its high atmospheric concentration and long-term effects. *Methane* - **Methane** is a potent greenhouse gas, with a much higher **global warming potential** per molecule than CO2 over a shorter timescale. - Its sources include agricultural activities (livestock, rice cultivation), natural gas leaks, and landfills. *Sulfur hexafluoride* - **Sulfur hexafluoride** is a synthetic greenhouse gas with an extremely high **global warming potential** and a very long atmospheric lifetime. - Although its atmospheric concentration is lower than CO2 or methane, its potency makes it a significant contributor in specialized industrial applications.

Question 1

Greenhouse gases are called as such because they:

Accepted Answer

Prevent the escape of heat waves reradiated from the earth's surface.

Answer

Are used in warming plant growth chambers.

Answer

Help in maintaining atmospheric O2 and CO2 balance.

Answer

Are produced by green photosynthesizing plants and are trapped in the earth's atmosphere.

Question 2

Which of the following is a non-natural gas causing the greenhouse effect?

Accepted Answer

Hydrofluorocarbons

Answer

Carbon dioxide (CO2)

Answer

Water vapor (H2O)

Answer

Ozone

Question 3

Which of the following is/are the greatest contributor(s) to global warming as a consequence of human activities and lifestyle?

Accepted Answer

Carbon dioxide

Answer

Chlorofluorocarbons

Answer

Methane

Answer

Ozone

Question 4

Which of the following is a direct health impact of climate change?

Accepted Answer

Heat-related illnesses

Answer

Food insecurity and malnutrition

Answer

Injuries from extreme weather events

Answer

Increased vector-borne diseases

Question 5

Which of the following gases is a significant contributor to the greenhouse effect?

Accepted Answer

All of the options

Answer

CO2

Answer

Methane

Answer

Sulfur hexafluoride

Climate Change and Health — MCQs

Climate Change and Health — MCQs

On this page

Practice by Chapter

Want unlimited practice?