Marine Organisms

3 Questions
  1. 1
    Consider the following kinds of organisms:
    1. Copepods
    2. Cyanobacteria
    3. Diatoms
    4. Foraminifera
    Which of the above are primary producers in the food chains of oceans?
    UPSC CSE I - 2021
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    Answer: B. 2 and 3

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  2. 2
    Consider the following statements :
    1. Most of the world's coral reefs are in tropical waters.
    2. More than one-third of the world's coral reefs are located in the territories of Australia, Indonesia and Philippines.
    3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.
    Which of the statements given above is/are correct ?
    UPSC CSE I - 2018
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    Answer: D. 1, 2 and 3

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  3. 3
    What would happen if phytoplankton of an ocean is completely destroyed for some reason?
    1. The ocean as a carbon sink would be adversely affected.
    2. The food chains in the ocean would be adversely affected.
    3. The density of ocean water would drastically decrease.
    Select the correct answer using the codes given below:
    UPSC CSE I - 2012
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    Answer: A. 1 and 2 only

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