Air is made up of many gases. Which gas is found in the greatest amount?
Nitrogen makes up approximately 78% of the Earth's atmosphere, making it the most abundant gas.
What is the % of oxygen in air?
Oxygen constitutes about 21% of the Earth's atmosphere.
Excessive heat from Sun is prevented by:
The ozone layer in the Earth's atmosphere absorbs most of the Sun's UV radiation, preventing excessive heat.
What happens when oil is burnt?
Burning oil releases carbon dioxide and energy as products of combustion.
What percentage of Earth’s atmosphere is nitrogen?
Nitrogen constitutes approximately 78% of the Earth's atmosphere.
Which gas in the air is most used for breathing and combustion?
Oxygen is essential for the processes of respiration in living organisms and combustion.
Which gas is present in the smallest amount in the air?
Carbon dioxide is present in very small amounts in the atmosphere, approximately 0.03-0.04%.
What is the role of carbon di-oxide in Earth's atmosphere?
Carbon dioxide acts as a greenhouse gas, trapping heat and helping to maintain the Earth's temperature.
Plants use carbon di-oxide for which process?
Plants use carbon dioxide during photosynthesis to produce glucose and oxygen.
What do plants form using nitrates made from nitrogen?
Plants use nitrates to form proteins, which are essential for their growth and development.
What is the height of the Earth's atmospheric layer above the surface?
The Earth's atmospheric layer extends over 480 km above the surface.
Which gas is essential for the process of burning?
Oxygen is essential for combustion, the process of burning.
What is the range of carbon di-oxide percentage in the atmosphere?
The percentage of carbon dioxide in the atmosphere ranges from 0.03% to 0.04%.
Which two gases are mainly involved in their own natural cycles in the atmosphere?
Oxygen and nitrogen are involved in their own natural cycles in the atmosphere, crucial for life processes.
Why do animals need oxygen?
Animals need oxygen for respiration, the process by which they generate energy.
What is the major component of air by volume?
Nitrogen is the major component of air by volume, making up about 78% of the atmosphere.
Which gas in the air is essential for respiration in animals and humans?
Oxygen is essential for respiration in animals and humans, allowing them to generate energy.
Which gas in the air is most important for the formation of proteins in plants and animals?
Nitrogen is crucial for the formation of proteins in both plants and animals.
Plants absorb nitrogen in what form?
Plants absorb nitrogen in the form of nitrogen compounds, primarily nitrates, from the soil.
Which gas do plants mainly take in during photosynthesis?
During photosynthesis, plants take in carbon dioxide to produce glucose and oxygen.
What happens during respiration in both plants and animals?
During respiration, both plants and animals take in oxygen and release carbon dioxide.
Which gas in the atmosphere protects us from harmful ultraviolet rays?
Ozone in the atmosphere protects us by absorbing harmful ultraviolet rays from the Sun.
What is the layer of gases surrounding the Earth called?
The layer of gases surrounding the Earth is called the atmosphere.
Which gas makes up the largest part of the air?
Nitrogen makes up the largest part of the air, accounting for about 78% of the Earth's atmosphere.
How is oxygen constantly replaced in the atmosphere?
Oxygen is constantly replaced in the atmosphere through the process of photosynthesis carried out by plants.
Who is credited with discovering oxygen?
Joseph Priestley is credited with discovering oxygen.
What gas is produced during both respiration and combustion?
Carbon dioxide is produced during both respiration and combustion.
Why is nitrogen called an “inactive” gas?
Nitrogen is called an "inactive" gas because it does not support burning or combustion.
What is the function of nitrogen-fixing bacteria in legume roots?
Nitrogen-fixing bacteria in legume roots convert nitrogen gas into nitrates, which plants can absorb and use.
Which of the following is not a part of the nitrogen cycle?
Photosynthesis is not a part of the nitrogen cycle; it is a process related to the carbon cycle.
Why do animals depend on plants for protein?
Animals depend on plants for protein because they cannot use nitrogen directly from the air; they obtain it through consuming plant or animal matter.
What is one major source of carbon dioxide in the atmosphere?
One major source of carbon dioxide in the atmosphere is the burning of fossil fuels.
What is the role of carbon dioxide in controlling Earth’s temperature?
Carbon dioxide traps heat in the atmosphere, acting as a greenhouse gas and helping to control Earth's temperature.
What happens if carbon dioxide levels become too high?
If carbon dioxide levels become too high, it can lead to global warming due to increased greenhouse effect.