Multiple choice

Consider the following statements:

  1. A hydrothermal vent is an ecosystem on the ocean floor.
  2. Animals living at the bottom of the sea are known as benthic.
  3. Gradual and predictable change in the species composition of a given area is referred to as primary succession.

Which of the given statements is/are correct?

  1. Only 1

  2. 1 and 2

  3. 2 and 3

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  1. Deep in the Southern Ocean near Antarctica, scientists have discovered 23 new animal species living in the hot, dark environment around hydrothermal vents, which is the most recently found ecosystem. A hydrothermal vent is a fissure in a planet's surface from which geothermally heated water is issued. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins and hotspots.
    1. Any water in a sea or lake that is neither close to the bottom nor near the shore can be said to be in the pelagic zone. Animals living at the bottom of the sea are known as benthic.
    2. Gradual and predictable change in the species composition of a given area is referred to as ecological succession.

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