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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)
    fixed
  • b)
    treated
  • c)
    decomposed
  • d)
    preserved
Correct answer is option 'A'. Can you explain this answer?
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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. How much percentage of fixed nitrogen is biological?

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. How can nitrogen canal be fixed in the atmosphere?

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. How can nitrogen canal be fixed in oceans?

Direction: Read the case study given below and answer any three of the questions that follow.The structure of an ecosystem involves a description of the available plant and animal species. From a structural point of view, all ecosystems consist of abiotic and biotic factors. Abiotic factors include rainfall, temperature, sunlight, atmospheric humidity, soil conditions, inorganic substances (carbon dioxide, water, nitrogen, calcium, phosphorus, potassium, etc.). Biotic factors include the producers, the consumers (primary, secondary, tertiary) and the decomposers. The producers include all the green plants, which manufacture their own food through photosynthesis. The primary consumers include herbivorous animals like deer, goats, mice and all plant-eating animals. The carnivores include all the flesh-eating animals like snakes, tigers and lions. Certain carnivores that feed also on carnivores are known as top carnivores like hawks and mongooses. Decomposers are those that feed on dead organisms (for example, scavengers like vultures and crows), and further break down the dead matter by other decomposing agents like bacteria and various microorganisms.The producers are consumed by the primary consumers whereas the primary consumers are, in turn, being eaten by the secondary consumers. Further, the secondary consumers are consumed by the tertiary consumers. The decomposers feed on the dead at each and every level. They change them into various substances such as nutrients, organic and inorganic salts essential for soil fertility. Organisms of an ecosystem are linked together through a food chain. For example, a plant eating beetle feeding on a paddy stalk is eaten by a frog, which is, in turn, eaten by a snake, which is then consumed by a hawk. This sequence of eating and being eaten and the resultant transfer of energy from one level to another is known as the foodchain. Transfer of energy that occurs during the process of a food chain from one level to another is known as flow of energy. However, food-chains are not isolated from one another. For example, a mouse feeding on grain may be eaten by different secondary consumers (carnivores) and these carnivores may be eaten by other different tertiary consumers (top carnivores). In such situations, each of the carnivores may consume more than one type of prey. As a result, the food-chains get interlocked with one another.This inter connecting network of species is known as food web. Generally, two types of food-chains are recognised: grazing food-chain and detritus food chain. In a grazing food-chain, the first level starts with plants as producers and ends with carnivores as consumers at the last level, with the herbivores being at the intermediate level. There is a loss of energy at each level which may be through respiration, excretion or decomposition. The levels involved in a food chain range between three to five and energy is lost at each level. A detritus food-chain is based on autotrophs energy capture initiated by grazing animals and involves the decomposition or breaking down of organic wastes and dead matter derived from the grazing food-chain.Q. Biotic factors includes

Direction: Read the case study given below and answer any three of the questions that follow.The structure of an ecosystem involves a description of the available plant and animal species. From a structural point of view, all ecosystems consist of abiotic and biotic factors. Abiotic factors include rainfall, temperature, sunlight, atmospheric humidity, soil conditions, inorganic substances (carbon dioxide, water, nitrogen, calcium, phosphorus, potassium, etc.). Biotic factors include the producers, the consumers (primary, secondary, tertiary) and the decomposers. The producers include all the green plants, which manufacture their own food through photosynthesis. The primary consumers include herbivorous animals like deer, goats, mice and all plant-eating animals. The carnivores include all the flesh-eating animals like snakes, tigers and lions. Certain carnivores that feed also on carnivores are known as top carnivores like hawks and mongooses. Decomposers are those that feed on dead organisms (for example, scavengers like vultures and crows), and further break down the dead matter by other decomposing agents like bacteria and various microorganisms.The producers are consumed by the primary consumers whereas the primary consumers are, in turn, being eaten by the secondary consumers. Further, the secondary consumers are consumed by the tertiary consumers. The decomposers feed on the dead at each and every level. They change them into various substances such as nutrients, organic and inorganic salts essential for soil fertility. Organisms of an ecosystem are linked together through a food chain. For example, a plant eating beetle feeding on a paddy stalk is eaten by a frog, which is, in turn, eaten by a snake, which is then consumed by a hawk. This sequence of eating and being eaten and the resultant transfer of energy from one level to another is known as the foodchain. Transfer of energy that occurs during the process of a food chain from one level to another is known as flow of energy. However, food-chains are not isolated from one another. For example, a mouse feeding on grain may be eaten by different secondary consumers (carnivores) and these carnivores may be eaten by other different tertiary consumers (top carnivores). In such situations, each of the carnivores may consume more than one type of prey. As a result, the food-chains get interlocked with one another.This inter connecting network of species is known as food web. Generally, two types of food-chains are recognised: grazing food-chain and detritus food chain. In a grazing food-chain, the first level starts with plants as producers and ends with carnivores as consumers at the last level, with the herbivores being at the intermediate level. There is a loss of energy at each level which may be through respiration, excretion or decomposition. The levels involved in a food chain range between three to five and energy is lost at each level. A detritus food-chain is based on autotrophs energy capture initiated by grazing animals and involves the decomposition or breaking down of organic wastes and dead matter derived from the grazing food-chain.Q. The decomposers feed on the dead at which level?

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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 2025 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 2025 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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