The process in which certain bacteria change nitrogen gas to a form that plants can absorb through their roots is known as what?

• Correct Answer: nitrogen fixation
• dioxide fixation
• pollen fixation
• oxygen fixation

Explanation: Even though nitrogen gas makes up most of Earth's atmosphere, plants cannot use this nitrogen gas to make organic compounds for themselves and other organisms. The two nitrogen atoms in a molecule of nitrogen gas are held together by a very stable triple bond. This bond must be broken for the nitrogen to be used. The nitrogen gas must be changed to a form called nitrates, which plants can absorb through their roots. The process of changing nitrogen gas to nitrates is called nitrogen fixation . It is carried out by nitrogen-fixing bacteria. The bacteria live in soil and roots of legumes, such as peas.

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