UPSC CSE PRELIMS 2020 STUDY PLAN – DAY 42

prelims 2020

UPSC CSE PRELIMS 2020 STUDY PLAN – DAY 42

TOPICS TO BE COMPLETED TODAY

HEADING

day-42

 

UPSC PRELIMS 2020 STUDY PLAN  (Click Here For Full Timetable)

 

VALUE ADDED NOTES  (SAMPLE)

SPECIATION

Day-42 mindmap

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MOCK PRELIMS QUIZ ON TODAY’S TOPIC

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Ecology and Ecosystem- Day 42 Quiz (Click Here)

 

QUIZ QUESTIONS 

1. Biological Oxygen Demand (BOD) is a standard criterion for
  • a. Measuring oxygen levels in blood
  • b. Computing oxygen levels in forest ecosystems
  • c. Pollution assay in aquatic ecosystems
  • d. Assessing oxygen levels in high altitude regions

 

2. Biochemical Oxygen Demand (BOD) refers to the amount to oxygen required by
  • a. Bacteria to break down the inorganic matter in atmosphere.
  • b. bacteria to break down the organic matter in water.
  • c. aquatic animals to survive in water.
  • d. Organisms to sustain at high altitudes.

 

3. With reference to the sedimentary type of bio geo chemical cycle. consider the following statements:

  1. In this cycle, the atmosphere act as a reservoir.
  2. The pliosphorous cycle is an example of the sedimentary bio geo chemical cycle.

Which of the statements given above is/are correct?

  • a. 1 only
  • b. 2 only
  • c. Both 1 and 2 only
  • d. Neither 1 and 2

 

4. Which of the following  is/are  methods in-situ conservation of bio diversity

  1. Botanical garden
  2. Wildlife sanctuary
  3. Sacred groves

Select the correct answer using the code Given below.

  • a. 2 only
  • b. 1 and 3 only
  • c. 2 and 3 only
  • d. 1, 2 and 3

 

5. Which one of the following is the best description of the term ”bio remediation”?
  • a. It is the enrichment of’ the nutrient quality of the soil using biological agents.
  • b. It is the increase of organo-metallic compounds in the organism through energy flow in an ecosystem.
  • c. It is the use of micro organisms to degrade the environmental contaminants into less toxic form.
  • d. It is the adoption of genetic variable plants for breeding of high yielding varieties.

 

6. With reference to different zones of an ocean ecosystem, consider the following statements:

  1. Littoral zone is the seashore area between the highest high tide and lowest low tide levels.
  2. Neritic zone is rich in phytoplankton and zooplankton.
  3. Benthic zone has limited production due to low nutrient supply.

Which of the statements given above are correct?

  • a. 1, 2 and 3
  • b. 1 and 2 only
  • c. 1 and 3 only
  • d. 2 and 3 only

 

7. In the context of agro-ecosystem, mulching and use of green manure leads to:

  1. reduction in moisture loss.
  2. reduction in soil erosion.
  3. increased weed generation.

Select the correct answer using the code given below.

  • a. 1 only
  • b. 1 and 2 only
  • c. 2 and 3 only
  • d. 1, 2 and 3

 

8. Which of the following agricultural practices could be used to conserve agro-ecosystems?

  1. The practice of inter-cropping.
  2. Increasing genetic diversity within crop species.
  3. Excessive use of chemical fertilizers.

Select the correct answer using the code given below.

  • a. 1 and 2 only
  • b. 2 only
  • c. 1 and 3 only
  • d. 1, 2 and 3

 

9. Which of the following Food Pyramids can be both upright and inverted?

  1. Pyramid of Numbers
  2. Pyramid of Biomass
  3. Pyramid of Energy

Select the correct answer using the code given below.

  • a. 1 and 2 only
  • b. 2 only
  • c. 1 and 3 only
  • d. 1, 2 and 3

 

10. Which of the following are natural ecosystem?

  1. Ocean
  2. Desert
  3. River
  4. Aquarium
  5. Garden

Select the correct answer using the code given below.

  • a. 1, 2, 4 and 5 only
  • b. 1, 3 and 5 only
  • c. 1, 2 and 3 only
  • d. 3, 4 and 5 only

 

11. Which of the following best describes the term ‘SpringShock‘?
  • a. It is the release of sulphuric acid in water bodies due to the melting of snow in Spring season.
  • b. It is the sudden change in air temperature at the onset of spring season.
  • c. It is the immediate warming of aquatic habitats at the onset of summer seasons.
  • d. It is the increase in water pollution due to increased evaporation from water bodies.

 

12. Which of the following is the correct sequence of food chain in a Marsh community?
  • a. Butterfly-Frog-Snake-Hawk
  • b. Butterfly-Frog-Hawk-Snake
  • c. Butterfly-Snake-Frog-Hawk
  • d. Frog-Butterfly-Hawk-Snake

 

13. With reference to aquatic  ecosystems, consider the following statements:

  1. In an aquatic ecosystem, the concentration of carbon dioxide is higher than the concentration of oxygen.
  2. An increase in CO2 content in the atmosphere decreases COconcentration in the aquatic ecosystem.

Which of the statements given above is/are correct?

  • a. 1 Only
  • b. 2 Only
  • c. Both 1 and 2
  • d. Neither 1 nor 2

 

14. In the context of environment and ecology, the phagotrophs are:
  • a. Producers
  • b. Consumers
  • c. Decomposers
  • d. None of the above

 

15. Consider the following statements about naturalized species.

  1. Most naturalized species are endemic to a certain environment.
  2. Exotic species can become naturalized species if they donot compete for resources with the native population.

Select the correct answer using the codes below.

  • a. 1 only
  • b. 2 only
  • c. Both 1 and 2
  • d. None of the above

 

16. Biodiversity hot spots are regions that have
  • a. Highest density of flora and fauna populations
  • b. Extremely unique flora and fauna population owing to the isolation of the environments
  • c. Very rich and endemic biodiversity that is also threatened due to various factors
  • d. A close association with equatorial vegetation

 

17. It is the only scaly mammal on earth.Some of its species are found in India as well It is
  • a. Leapin Lizard
  • b. Alligator
  • c. Pangolinc
  • d. Aldabra Tortoise

 

18. The terms ‘Boto’, ‘Tucuxi’, ‘Baiji’ are seen in news sometimes. These are related to which of the following?
  • a. These are different species of flower found in Western Ghat
  • b. These are the names of different species of Dolphins
  • c. These are fruit bats which hosts Nipah virus
  • d. These are different species of butterflies found in Eastern Himalaya

 

19. Consider the following statements:

  1. Neelakurinji flower blooms in the Anamalai hills once in 12 years.
  2. Neelakurinji plant is a tropical plant species which is generally found in Asia and Australia.

Which of the statements given above is/are correct?

  • a. 1 only
  • b. 2 onlyc
  • c. Booth 1 and 2
  • d. Neither 1 nor 2

 

20. Which of the following characteristics of a species is/ used to define an invasive species‘?

  1. Its absence becomes seriously destructive for ecosystems.
  2. It is non-native or alien to an ecosystem.
  3. Its introduction  helps in sustaining

Select the correct answer using the code given below.

  • a. 2 only
  • b. 1 and 3 only
  • c. 2 and 3 only
  • d. 1, 2 and 3

 

21. Which of the following are regarded  as ecosystem services?

  1. Soil formation
  2. Nutrient cycling
  3. Habitat for wildlife
  4. Climate regulation

Select the correct answer using the code given below.

  • a. 1 and 2 only
  • b. 3 and 4 only
  • c. 1, 2 and 3 only
  • d. 1, 2, 3 and 4

 

22. Which of the following is/are considered as abiotic components of an ecosystem?

  1. Dead organic matter
  2. Sunlight
  3. Soil texture and topography

Select the correct answer using the code given below.

  • a. 2 only
  • b. 1 and 2 only
  • c. 1 and 3 only
  • d. 1, 2 and 3

 

23. Which of the following best describes the Gross Primary Productivity of an ecosystem?
  • a. The rate of production of organic matter during photosynthesis.
  • b. The rate of production of organic matter during photosynthesis minus respiration losses.
  • c. The rate of formation of the new organic matter by consumers.
  • d. None of the above.

 

24. What is true of matter in ecosystems?
  • a. The primary productivity of an ecosystem does not depend on the availability of nutrients.
  • b. Living things can recycle elements within an ecosystem as long as decomposers are present.
  • c. Matter flows in a one-way direction with a 10% loss at each move up in trophic level.
  • d. Elements continuously cycle between the physical environment and living organisms.

 

25. Consider the following statements regarding All India Survey on Higher Education (AISHE) Report 2017-18:

  1. Gross Enrolment Ratio across institutions of higher education has decreased considerably from 2010-11.
  2. The survey covers only  the Government Institutions in the country engaged in imparting of higher education.

Which of the statements given above is/are incorrect?

  • a. 1 only
  • b. 2 only
  • c. Both 1 and 2
  • d. Neither 1 nor 2

 

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