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Question 1 of 5
1. Question
Which of the following significantly adds nitrogen to the soil?
- Burning of coal by man
- Death of vegetation
- Excretion of urea by animals
Select the correct answer code.
Correct
Solution: c)
- Burning of coal by man is the main source of atmospheric carbon dioxide. It has nothing to do with adding nitrogen to the soil.
• Nitrogenous waste products of living organisms such as urea and dead remain of organisms are converted back into inorganic ammonia by the bacteria.
Incorrect
Solution: c)
- Burning of coal by man is the main source of atmospheric carbon dioxide. It has nothing to do with adding nitrogen to the soil.
• Nitrogenous waste products of living organisms such as urea and dead remain of organisms are converted back into inorganic ammonia by the bacteria.
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Question 2 of 5
2. Question
Consider the following statements.
- Animals need large quantities of Phosphorus to make shells, bones and teeth.
- The natural reservoir of phosphorus is rock.
- Like carbon cycle, there is respiratory release of phosphorus into atmosphere.
Which of the above statements is/are correct?
Correct
Solution: c)
- Phosphorus is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems. Many animals also need large quantities of this element to make shells, bones and teeth. The natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants.
- Herbivores and other animals obtain this element from plants. The waste products and the dead organisms are decomposed by phosphate-solubilising bacteria releasing phosphorus. Unlike carbon cycle, there is no respiratory release of phosphorus into atmosphere.
Incorrect
Solution: c)
- Phosphorus is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems. Many animals also need large quantities of this element to make shells, bones and teeth. The natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants.
- Herbivores and other animals obtain this element from plants. The waste products and the dead organisms are decomposed by phosphate-solubilising bacteria releasing phosphorus. Unlike carbon cycle, there is no respiratory release of phosphorus into atmosphere.
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Question 3 of 5
3. Question
Consider the following statements regarding carbon and phosphorus cycle.
- Atmospheric inputs of phosphorus through rainfall is much higher than carbon inputs.
- Gaseous exchanges of phosphorus between organism and environment are negligible.
Which of the above statements is/are correct?
Correct
Solution: b)
• Differences between carbon and phosphorus cycle are firstly, atmospheric inputs of phosphorus through rainfall are much smaller than carbon inputs, and, secondly, gaseous exchanges of phosphorus between organism and environment are negligible.
Incorrect
Solution: b)
• Differences between carbon and phosphorus cycle are firstly, atmospheric inputs of phosphorus through rainfall are much smaller than carbon inputs, and, secondly, gaseous exchanges of phosphorus between organism and environment are negligible.
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Question 4 of 5
4. Question
Consider the following statements regarding ‘Agenda 21’
- Agenda 21 is a non-binding, voluntarily implemented action plan of the United Nations with regard to sustainable development.
- The ’21’ in Agenda 21 refers to the 21 major industrial countries of the world.
- It is a product of the Earth Summit (UN Conference on Environment and Development) held in Rio de Janeiro, Brazil, in 1992.
Which of the above statements is/are correct?
Correct
Solution: d)
- The ’21’ in Agenda 21 refers to the 21st century.
• Agenda 21 is a non-binding action plan of the United Nations with regard to sustainable development. It is a product of the Earth Summit (UN Conference on Environment and Development) held in Rio de Janeiro, Brazil, in 1992.
Incorrect
Solution: d)
- The ’21’ in Agenda 21 refers to the 21st century.
• Agenda 21 is a non-binding action plan of the United Nations with regard to sustainable development. It is a product of the Earth Summit (UN Conference on Environment and Development) held in Rio de Janeiro, Brazil, in 1992.
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Question 5 of 5
5. Question
Consider the following statements about Photosynthetically Active Radiation (PAR).
- Photosynthetically Active Radiation (PAR)is the amount of light available for photosynthesis.
- PAR changes seasonally and varies depending on the latitude and time of day.
- Higher PAR leads to decrease in plant growth.
- Air pollution does have an effect on PAR.
Which of the above statements is/are correct?
Correct
Solution: a)
- Photosynthetically Active Radiation (PAR)is the amount of light available for photosynthesis, which is light in the 400 to 700 nanometer wavelength range. PAR changes seasonally and varies depending on the latitude and time of day.
- Levels are greatest during the summer at mid-day.
- Air pollution also affects PAR by filtering out the amount of sunlight that can reach plants.
Photosynthetically Active Radiation is needed for photosynthesis and plant growth. Higher PAR promotes plant growth.
Incorrect
Solution: a)
- Photosynthetically Active Radiation (PAR)is the amount of light available for photosynthesis, which is light in the 400 to 700 nanometer wavelength range. PAR changes seasonally and varies depending on the latitude and time of day.
- Levels are greatest during the summer at mid-day.
- Air pollution also affects PAR by filtering out the amount of sunlight that can reach plants.
Photosynthetically Active Radiation is needed for photosynthesis and plant growth. Higher PAR promotes plant growth.
