Why plants are unable to fix nitrogen by themselves?

It is easily available from the soil

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They lack the nitrogenase enzyme complex

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The process has a very high requirement of ATP per mole of N

_{2}

fixed.

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Hydrogen evolved in the process is deleterious to plants.

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Solution

The correct option is B They lack the nitrogenase enzyme complex
Plants can not fix nitrogen by themselves because it needs an enzyme called nitrogenase, which is generally absent in plants. Plants require nitrogen for their metabolic processes as well as growth. Plants are unable to fulfill their needs with the di-nitrogen available in the earths atmosphere. They require nitrogen in the form of nitrate or ammonium, both of which are more complex forms (NH $_{3}$ , NH $_{4}$ , NO $_{2}$ or NO $_{3}$ ) that are found in the soil. Diazotrophs are bacteria that contain nitrogenase, the enzyme responsible for biological nitrogen fixation (BNF). Diazotrophs include cyanobacteria, green sulfur bacteria, azotobacteraceae, rhizobia, and frankia.

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Similar questions

Refer the given passage and answer the following questions.

At present the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more

N_{2}

than they consume. These plants show symbioticz relationship with

N_{2}

-fixing bacteria such as Rhizobium. These bacteria produce root nodules in leguminous plants and convert atmospheric

N_{2}

into nitrogenous compounds. Rhizobium bacteria are gram negative bacteria, which show host specificity and fix

N_{2}

in the presence of a red pigment called leghaemoglobin. It protects nitrogen fixing enzyme nitrogenase from oxygen.

Which of the following statements is incorrect?

Assertion (A): Higher plants can not utilize nitrogen that is present in the form of $N_{2}$ in air.

Reason (R): In higher plants, the nitrogenase enzyme is absent.

Q. Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation.
Which one of the following statements is not correct for this process of nitrogen fixation?

Plants fix nitrogen to produce protein. This process is called___.

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following is not correct during the process of this nitrogen fixation?

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