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Question

Which of the following respires only anaerobically?


A

Cockroaches

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B

Yeast

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C

Fungi

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D

All bacteria

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Solution

The correct option is B

Yeast


The correct option is B.

Explanation of the correct option:

  1. Obligate anaerobes are organisms that cannot survive in the presence of oxygen.
  2. Yeast, also known as Saccharomyces cerevisiae is an example.
  3. It is a saprotrophic fungus.
  4. In the absence of oxygen, it converts the glucose in the food to ethanol and carbon dioxide by a process called fermentation.

Explanation of the incorrect options:

Option A:

  1. The cockroach is an insect that cannot survive in the absence of oxygen.
  2. It needs oxygen to produce energy from the food it consumes.

Option C:

  1. Fungi can live in both aerobic and anaerobic environments.
  2. Fusarium, Penicillium, and other aerobic fungi are examples.

Option D:

  1. Bacteria can be both aerobic and anaerobic.
  2. Anaerobic bacteria are present in the gut.
  3. Aerobic bacteria include Pseudomonas, Bacillus, and others.

Final answer: Yeast respires only anaerobically.


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