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Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.
Q. Generally, nitrogen is usable only after it is _________.
  • a)
    fixed
  • b)
    treated
  • c)
    decomposed
  • d)
    preserved
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Direction: Read the case study given below and answer any three of th...
An overview of nitrogen fixation. nitrogen fixation, any natural or industrial process that causes free nitrogen (N2), which is a relatively inert gas plentiful in air, to combine chemically with other elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or nitrites.
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Direction: Read the case study given below and answer any three of th...
Explanation:
Fixed Nitrogen:
- Nitrogen is usable only after it is fixed, which means converting nitrogen gas (N2) into a form that can be utilized by living organisms.
- Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of fixing nitrogen directly in its gaseous form.
Biological Fixation:
- Ninety per cent of fixed nitrogen is biological in nature, with the principal source being the action of soil micro-organisms and associated plant roots on atmospheric nitrogen.
- This process occurs in the pore spaces of the soil, where nitrogen gas is converted into a form that plants can absorb and use.
Role of Green Plants:
- After atmospheric nitrogen has been fixed into an available form, green plants play a crucial role in assimilating it through their roots.
- Herbivorous animals then consume these plants, transferring the nitrogen up the food chain.
Conversion by Bacteria:
- Dead plants and animals, as well as nitrogenous wastes, are converted into nitrites by the action of bacteria present in the soil.
- Some bacteria further convert nitrites into nitrates, which can be used again by green plants for growth and development.
Denitrification:
- There are also bacteria capable of converting nitrates back into free nitrogen through a process known as denitrification.
- This completes the nitrogen cycle, where nitrogen is continuously recycled between the atmosphere, soil, plants, and animals to support life processes.
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Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer?
Question Description
Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? for Humanities/Arts 2024 is part of Humanities/Arts preparation. The Question and answers have been prepared according to the Humanities/Arts exam syllabus. Information about Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Humanities/Arts 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Humanities/Arts. Download more important topics, notes, lectures and mock test series for Humanities/Arts Exam by signing up for free.
Here you can find the meaning of Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Direction: Read the case study given below and answer any three of the questions that follow.Nitrogen is a major constituent of the atmosphere comprising about seventy-eight per cent of the atmospheric gases. It is also an essential constituent of different organic compounds such as the amino acids, nucleics acids, proteins, vitamins and pigments. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form. Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen cycle be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. After atmospheric nitrogen has been fixed into an available form, green plants can assimilate it. Herbivorous animals feeding on plants, in turn, consume some of it. Dead plants and animals, excretion of nitrogenous wastes are converted into nitrites by the action of bacteria present in the soil. Some bacteria can even convert nitrites into nitrates that can be used again by green plants. There are still other types of bacteria capable of converting nitrates into free nitrogen, a process known as denitrification.Q. Generally, nitrogen is usable only after it is _________.a)fixedb)treatedc)decomposedd)preservedCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Humanities/Arts tests.
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