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The Nitrogen Cycle Video Lecture | Science Class 7

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FAQs on The Nitrogen Cycle Video Lecture - Science Class 7

1. What is the nitrogen cycle?
Ans. The nitrogen cycle is the process by which nitrogen is converted into different forms as it circulates between the atmosphere, soil, and living organisms. It involves several steps, including nitrogen fixation, nitrification, assimilation, ammonification, and denitrification.
2. How does nitrogen fixation occur in the nitrogen cycle?
Ans. Nitrogen fixation is the process in which atmospheric nitrogen (N2) is converted into a usable form, such as ammonia (NH3) or nitrate (NO3-), by certain bacteria. These bacteria can be free-living in the soil or symbiotic, forming a mutualistic relationship with leguminous plants or other nitrogen-fixing organisms.
3. What is nitrification in the nitrogen cycle?
Ans. Nitrification is the process in which ammonia (NH3) is converted into nitrite (NO2-) and then into nitrate (NO3-). This conversion is carried out by two types of bacteria: ammonia-oxidizing bacteria (AOB), which convert ammonia to nitrite, and nitrite-oxidizing bacteria (NOB), which further convert nitrite to nitrate.
4. How does assimilation occur in the nitrogen cycle?
Ans. Assimilation is the process by which plants and animals incorporate nitrogen compounds, such as nitrate or ammonium ions, into their own organic molecules. Plants take up these nitrogen compounds from the soil and use them to build proteins and other essential molecules. Animals obtain nitrogen by consuming plants or other animals.
5. What is denitrification in the nitrogen cycle?
Ans. Denitrification is the process in which nitrates (NO3-) are converted back into atmospheric nitrogen (N2) by denitrifying bacteria. This occurs in oxygen-depleted environments, such as waterlogged soils or sediments. Denitrification helps to balance the nitrogen cycle by returning nitrogen to the atmosphere, completing the cycle.
111 videos|246 docs|28 tests

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