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VisionIAS - Online Self Test
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Questions for practice
1) Which of the following conditions is essential for coral reef growth?

(a) Location near large river deltas.

(b) High levels of sediment in the water.

(c) Average salinity around 35 parts per thousand.

(d) Water temperatures consistently below 15°C.

2) What is the primary cause of coral bleaching?

(a) Growth of zooxanthellae in coral tissues.

(b) Increased absorption of calcium carbonate by corals.

(c) Expulsion of zooxanthellae due to stress.

(d) Decreased ocean temperatures.

3) The Sargasso Sea is characterized by:

(a) A location near the equator with high salinity levels.

(b) Relatively stagnant water and floating Sargassum seaweed.

(c) Cold, nutrient-rich waters and sparse vegetation.

(d) Strong currents and an abundance of marine life.

4)

Consider the following statements regarding fringing reefs:

  1. They are located farther offshore, separated from the land by a wide lagoon.
  2. They develop close to the coastline in discontinuous patches.
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

5)

Consider the following statements regarding the Gulf Stream:

  1. It is a cold current that flows along the western coast of North America.
  2. It is a warm current that follows the eastern coast of North America.
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

6)

Consider the following statements regarding the South Equatorial Current (Atlantic Ocean):

  1. The southern branch of SEC splits upon reaching South America.
  2. It moves eastward near the equator.
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

7)

Consider the following statements regarding ocean acidification:

  1. It inhibits corals ability to absorb calcium carbonate.
  2. It increases the pH of ocean water.
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

8)

Consider the following statements regarding the ecological significance of coral reefs:

  1. They protect coastlines from wave action and storm surges.
  2. They house approximately 25 percent of all marine species.
  3. They serve as nurseries and habitats for numerous fish.
  4. They provide limited insight into ancient climate history.
Which of the statements given above is/are correct?

(a) 1, 2 and 3 only

(b) 2 and 3 only

(c) 4 only

(d) 1 and 3 only

9)

Consider the following statements regarding the Benguela Current:

  1. It is a warm current flowing south along Brazil s east coast.
  2. It primarily influences marine life and regional climate off Argentina’s southern coasts.
  3. It is a cold current flowing north along Africa’s southwest coast.
  4. It eventually rejoins the South Equatorial Current.

Which of the statements given above is/are correct?

 

(a)1, 2, 3 and 4

(b)4 only

(c)3 only

(d)3 and 4 only

10)

Consider the following statements regarding the factors causing coral bleaching:

  1. Excessive sediment hampers coral feeding and respiration.
  2. Increased CO₂ lowers pH, inhibiting corals’ ability to absorb calcium carbonate.
  3. Ocean warming induces bleaching, especially during marine heatwaves.
  4. Decreased pollution disrupts coral health.
Which of the statements given above is/are correct?

(a) 2 and 4 only

(b) 1, 2 and 3 only

(c) 1 and 4 only

(d) 3 only



Answers
1) c
2) c
3) b
4) b
5) b
6) a
7) a
8) a
9) d
10) b