Bacteria in swelling on the roots of peanut plants convert blank gas from the air into compounds that the plants need to grow.
Not only peanuts but many plants fix Nitrogen.
Bacteria in the swelling on the roots of peanut plants convert atmospheric nitrogen gas (N2) into compounds that the plants can use to grow. This process is known as nitrogen fixation.
To determine the blank in the sentence, we need to identify the specific gas that bacteria in the swelling on the roots of peanut plants convert into compounds that the plants need to grow.
In this case, the gas in question is nitrogen (N2). Bacteria called rhizobia form a symbiotic relationship with legume plants, such as peanut plants. These bacteria have the unique ability to capture nitrogen gas from the air and convert it into a usable form called ammonia (NH3) through a process called nitrogen fixation.
Nitrogen is an essential nutrient for plant growth, but most plants cannot directly use atmospheric nitrogen. The rhizobia bacteria actively work with the plants in specialized structures called root nodules. The bacteria reside within the nodules and convert nitrogen gas into ammonia, which is then used by the plants to produce various compounds, including proteins and nucleic acids.
Therefore, the blank gas in the sentence is "nitrogen."