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Question

The process by which an organism take in oxygen and give out carbon dioxide is called _______ .

A
excretion
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B
breathing
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C
reproduction
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D
digestion
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Solution

The correct option is C

Explanation of the incorrect option:

  1. Breathing means taking in air rich in oxygen and giving out air rich in carbon dioxide with the help of respiratory organs.
  2. The taking in of air rich in oxygen into the body is called inhalation and giving out of air rich in carbon dioxide is known as exhalation.
  3. It is a continuous process which goes on all the time and throughout the life of an organism.
  4. The number of times a person breathes in a minute is termed as the breathing rate.
  5. During breathing inhalation and exhalation take place alternately.
  6. A breath means one inhalation plus one exhalation.

Explanation of the incorrect option:

Option A
  1. Reproduction is the process by which new species/organism is produced.
  2. Reproduction can be sexual or asexual. Reproduction is essential for the continuation of a species.
Option B
  1. Digestion is one among many life processes observed in nearly all living organisms.
  2. The process involves breaking down complex molecules into simpler molecules that can be readily absorbed by the body.
Option D
  1. Excretion is the process by which organisms expel metabolic waste products and other toxic substances from their body.
  2. It regulates a systematic working of all the body organs and keeps us healthy.

Final answer:

The process by which an organism take in oxygen and give out carbon dioxide is called

Breathing.


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