23 July Static Quiz 2021
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23 July Static Quiz 2021 for UPSC Prelims
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- Question 1 of 5
1. Question
Large scale deforestation in a forest can cause the fertility of soil to decline. Why?
(1) Soil can be leached easily due to heavy rain
(2) Microbial activity in the soil increases significantly
(3) Nutrient content of the soil changes.
Select the correct answer using the codes below.CorrectCorrect Answer: C
Answer Justification : Explanation: Removal of the top layer of the soil during deforestation exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. So, statement 3 is correct.
Microbial activity in the soil actually decreases due to the loss of biodiversity and the forest. Statement 2 is incorrect.
As the soil is exposed, rainwater can easily leach washing off nutrients in run-off water. Statement 1 is correct.IncorrectCorrect Answer: C
Answer Justification : Explanation: Removal of the top layer of the soil during deforestation exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. So, statement 3 is correct.
Microbial activity in the soil actually decreases due to the loss of biodiversity and the forest. Statement 2 is incorrect.
As the soil is exposed, rainwater can easily leach washing off nutrients in run-off water. Statement 1 is correct. - Question 2 of 5
2. Question
Water can be considered polluted due to
(1) High concentration of nutrients
(2) Higher temperature
(3) Presence of larvae eating fish
Select the correct answer using the codes below.CorrectCorrect Answer : A
Answer Justification : Explanation: Freshwater fishes like mosquitofish are used to feed on larvae to biocontrol mosquito population. Such fishes are not a sign ofwater pollution.
Statement 3 is incorrect. Hot water released from plants and industries raises the average temperature of the waterbody, adversely affecting the animals and plants living in it. It is a form of pollution.
Statement 2 is correct.
Statement 1 causes eutrophication (algal boom) in water bodies resulting in higher consumption of oxygen and loss to aquatic life: hence, correct.IncorrectCorrect Answer : A
Answer Justification : Explanation: Freshwater fishes like mosquitofish are used to feed on larvae to biocontrol mosquito population. Such fishes are not a sign ofwater pollution.
Statement 3 is incorrect. Hot water released from plants and industries raises the average temperature of the waterbody, adversely affecting the animals and plants living in it. It is a form of pollution.
Statement 2 is correct.
Statement 1 causes eutrophication (algal boom) in water bodies resulting in higher consumption of oxygen and loss to aquatic life: hence, correct. - Question 3 of 5
3. Question
Among the following, maximum land in India has been degraded to wasteland due to
CorrectAnswer: D
IncorrectAnswer: D
- Question 4 of 5
4. Question
Deforestation affects which of these soil properties?
(1) Topsoil content
(2) Microbial activity
(3) Nutrient content
(4) Soil texture
(5) Water holding capacity
Select the correct answer using the codes below.CorrectJustification: Statement 1: Removal of the top layer of the soil during deforestation exposes the lower, hard and rocky layers. This soil has less humus and is less fertile.
Statement 2: Microbial activity in the soil actually decreases due to the loss of biodiversity and the forest.
Statement 3 and 4: As the soil is exposed, rainwater can easily leach
washing off nutrients in run-off water.
This also changes soil texture.
Statement 5: The movement of water from the soil surface into the ground(infiltration rate) is reduced due to increased surface runoff as water is not stopped.IncorrectJustification: Statement 1: Removal of the top layer of the soil during deforestation exposes the lower, hard and rocky layers. This soil has less humus and is less fertile.
Statement 2: Microbial activity in the soil actually decreases due to the loss of biodiversity and the forest.
Statement 3 and 4: As the soil is exposed, rainwater can easily leach
washing off nutrients in run-off water.
This also changes soil texture.
Statement 5: The movement of water from the soil surface into the ground(infiltration rate) is reduced due to increased surface runoff as water is not stopped. - Question 5 of 5
5. Question
Forest fires can cause which of the following adverse impacts on the environment?
(1) Degradation of water catchment areas resulting in loss of water
(2) Change in the microclimate of the area degrading living conditionsCorrectCorrect Answer: C Answer Justification :
Justification: It can lead to loss of valuable timber resources and depletion of carbon sinks Degradation of water catchment areas resulting in loss of water Loss Of biodiversity and extinction of plants and animals Loss of wildlife habitat and depletion of wildlife
Loss of natural regeneration and reduction in forest cover and production Global warming resulting in rising temperature
Loss of carbon sink resource and increase in percentage of CO2 in the atmosphere Change in micro climate of the area making it unhealthy living conditions Soil erosion affecting the productivity of soils and production Ozone layer depletion
Health problems leading to diseases Indirect effects on agricultural production: Loss of livelihood for the tribals as approximately 65 million people are classified as tribals who directly depend upon collection of non-timber forest products from the forest areas for their
livelihood.IncorrectCorrect Answer: C Answer Justification :
Justification: It can lead to loss of valuable timber resources and depletion of carbon sinks Degradation of water catchment areas resulting in loss of water Loss Of biodiversity and extinction of plants and animals Loss of wildlife habitat and depletion of wildlife
Loss of natural regeneration and reduction in forest cover and production Global warming resulting in rising temperature
Loss of carbon sink resource and increase in percentage of CO2 in the atmosphere Change in micro climate of the area making it unhealthy living conditions Soil erosion affecting the productivity of soils and production Ozone layer depletion
Health problems leading to diseases Indirect effects on agricultural production: Loss of livelihood for the tribals as approximately 65 million people are classified as tribals who directly depend upon collection of non-timber forest products from the forest areas for their
livelihood.
