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We will post 5 questions daily on static topics mentioned in the UPSC civil services preliminary examination syllabus. Each week will focus on a specific topic from the syllabus, such as History of India and Indian National Movement, Indian and World Geography, and more.
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Question 1 of 5
1. Question
Consider the following statements regarding Root bridges.
- Root bridges in India are located at Mawlynnong in Meghalaya.
- Such bridges have been developed by Khasi villagers by weaving the roots of ficus trees.
Which of the above statements is/are correct?
Correct
Solution: c)
Incorrect
Solution: c)
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Question 2 of 5
2. Question
Which of the following can be the reasons for greater biological productivity at the tropics as compared to temperate region?
- Tropics have remained relatively undisturbed for longer durations than temperate region.
- Higher solar energy is available at tropics.
- Less extreme seasonal variation at tropics as compared to the temperate region.
How many of the above statements is/are correct?
Correct
Solution: c)
There is more solar energy available in the tropics, which contributes to higher productivity; this in turn might contribute indirectly to greater diversity.
Tropical environments, unlike temperate ones, are less seasonal, relatively more constant and predictable. Such constant environments promote niche specialisation and lead to a greater species diversity.
Speciation is generally a function of time, unlike temperate regions subjected to frequent glaciations in the past, tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long evolutionary time for species diversification.
Incorrect
Solution: c)
There is more solar energy available in the tropics, which contributes to higher productivity; this in turn might contribute indirectly to greater diversity.
Tropical environments, unlike temperate ones, are less seasonal, relatively more constant and predictable. Such constant environments promote niche specialisation and lead to a greater species diversity.
Speciation is generally a function of time, unlike temperate regions subjected to frequent glaciations in the past, tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long evolutionary time for species diversification.
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Question 3 of 5
3. Question
Consider the following statements regarding Carbonisation.
- It involves pyrolysis of organic carbon to produce coke.
- Wood does not undergo carbonisation.
- A major advantage of industrial carbonisation is that no carbon monoxide emissions are involved.
How many of the above statements is/are correct?
Correct
Solution: a)
Only Statement 1 is correct.
Fossil fuels generally are the products of the carbonisation of vegetable matter. The term carbonisation is also applied to the pyrolysis of coal to produce coke. Carbonisation is also a stage in the charcoal making process, and is considered the most important step of all since it has such power to influence the whole process from the growing tree to the final distribution of charcoal to various sources. The gas produced by carbonisation has a high content of carbon monoxide which is poisonous when breathed.
Incorrect
Solution: a)
Only Statement 1 is correct.
Fossil fuels generally are the products of the carbonisation of vegetable matter. The term carbonisation is also applied to the pyrolysis of coal to produce coke. Carbonisation is also a stage in the charcoal making process, and is considered the most important step of all since it has such power to influence the whole process from the growing tree to the final distribution of charcoal to various sources. The gas produced by carbonisation has a high content of carbon monoxide which is poisonous when breathed.
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Question 4 of 5
4. Question
Apart from bacteria, which of the following living species may be involved in the nitrogen cycle in our atmosphere?
- Humans
- Animals
- Green plants
How many of the above options is/are correct?
Correct
Solution: c)
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make proteins. These proteins and other complex compounds are subsequently consumed by animals.
Once the animal or the plant dies, other bacteria in the soil convert the various compounds of nitrogen back into nitrates and nitrites. A different type of bacteria converts the nitrates and nitrites into elemental nitrogen.
Thus, there is a nitrogen-cycle in nature in which nitrogen passes from its elemental form in the atmosphere into simple molecules in the soil and water, which get converted to more complex molecules in living beings and back again to the simple nitrogen molecule in the atmosphere.
Incorrect
Solution: c)
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make proteins. These proteins and other complex compounds are subsequently consumed by animals.
Once the animal or the plant dies, other bacteria in the soil convert the various compounds of nitrogen back into nitrates and nitrites. A different type of bacteria converts the nitrates and nitrites into elemental nitrogen.
Thus, there is a nitrogen-cycle in nature in which nitrogen passes from its elemental form in the atmosphere into simple molecules in the soil and water, which get converted to more complex molecules in living beings and back again to the simple nitrogen molecule in the atmosphere.
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Question 5 of 5
5. Question
Consider the following statements regarding Aerosols.
- Some aerosols are reflective, i.e. when the sun’s rays beam down on them, they bounce the rays back out of the atmosphere.
- Particulate air pollutants and smoke are the examples of natural aerosols.
Which of the above statements is/are incorrect?
Correct
Solution: b)
An aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, mist, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are particulate air pollutants and smoke.
Aerosols influence climate in two primary ways: by changing the amount of heat that gets in or out of the atmosphere, or by affecting the way clouds form.
Some aerosols, like many kinds of dust from ground-up rocks, are light-colored and even a little bit reflective. When the sun’s rays beam down on them, they bounce the rays back out of the atmosphere, preventing that heat from ever reaching Earth’s surface.
Incorrect
Solution: b)
An aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, mist, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are particulate air pollutants and smoke.
Aerosols influence climate in two primary ways: by changing the amount of heat that gets in or out of the atmosphere, or by affecting the way clouds form.
Some aerosols, like many kinds of dust from ground-up rocks, are light-colored and even a little bit reflective. When the sun’s rays beam down on them, they bounce the rays back out of the atmosphere, preventing that heat from ever reaching Earth’s surface.
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