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Questions and Answers
What is the primary component of air?
What is the primary component of air?
Carbon dioxide is a major component of air, making up 21% of its composition.
Carbon dioxide is a major component of air, making up 21% of its composition.
False
What gas is produced as a byproduct of photosynthesis?
What gas is produced as a byproduct of photosynthesis?
Oxygen
The equation for respiration can be summarized as: C₆H₁₂O₆ + 6O₂ → _____ + _____
The equation for respiration can be summarized as: C₆H₁₂O₆ + 6O₂ → _____ + _____
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Match the gas with its test:
Match the gas with its test:
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What color change indicates the presence of carbon dioxide in hydrogen carbonate indicator?
What color change indicates the presence of carbon dioxide in hydrogen carbonate indicator?
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Exhaled air contains more oxygen than inhaled air.
Exhaled air contains more oxygen than inhaled air.
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What human activities are contributing to increased CO₂ levels in the atmosphere?
What human activities are contributing to increased CO₂ levels in the atmosphere?
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In photosynthesis, light energy is absorbed by _____ to convert CO₂ and water into glucose.
In photosynthesis, light energy is absorbed by _____ to convert CO₂ and water into glucose.
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Which of the following is NOT an air pollutant mentioned?
Which of the following is NOT an air pollutant mentioned?
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Study Notes
Composition of Air
- Air is composed of 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, and 0.9% noble gases.
- Water vapor and other gases are also present in varying amounts.
Testing for Gases
- Oxygen: Supports burning; relights a glowing splint.
- Carbon Dioxide: Supports burning, denser than air; turns a red-yellow litmus indicator to yellow, turns limewater from clear to milky.
Breathing Mechanism
- Breathing involves gas exchange in the lungs:
- Inhaled air enters the blood in capillaries.
- Carbon dioxide is removed from the blood and exhaled.
- Oxygen is absorbed by the blood and transported to the body.
Respiration
- Respiration is the process of breaking down glucose (food) to release energy.
- Oxygen is needed and carbon dioxide is produced.
- Respiration in cells involves controlled chemical reactions inside cells. Stored chemical energy in glucose is released.
Photosynthesis
- Plants use sunlight to convert carbon dioxide and water into glucose (food) and release oxygen.
- The process occurs in the presence of chlorophyll and involves chemical reactions within the plant cells.
- Photosynthesis and respiration balance the carbon dioxide and oxygen levels in the environment.
Effect of Pollutants
- Exposure to pollutants like sulphur dioxide, nitrogen oxides, ozone, carbon monoxide, and suspended particulates can cause irritation to the eyes, headache, breathing problems, and other health risks.
- Air pollutants disrupt the balance in the atmosphere. The effects are a noticeable and harmful impact.
- AQHI (Air Quality Health Index) tells the public about possible risks from air pollutants and suggests precautions.
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Description
This quiz covers the composition of air, the mechanisms of breathing, and the processes of respiration and photosynthesis. Understand how gases like oxygen and carbon dioxide are exchanged in the lungs and how plants use sunlight to convert carbon dioxide into energy. Test your knowledge on these essential biological concepts.
