Multiple choice

Chemoautotrophs are those organisms which

  1. Use inorganic chemicals to manufacture nutrient molecules

  2. Use organic chemicals like glucose to manufacture nutrient molecules

  3. Obtain and utilize geothermal energy

  4. None of these
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A Correct answer
Explanation

The residents of deep-sea hydrothermal vents obtain energy from inorganic chemicals surrounding them. Bacteria, for example, extract energy from the chemical bonds of hydrogen sulphide (H2S) and then add the freed hydrogens to carbon dioxide to synthesize organic nutrient compounds. Organisms like these, which use inorganic chemicals to manufacture nutrient molecules, are called chemoautotrophs.

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