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?

The coordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners.
Leghaemoglobin functions as oxygen scavenger during $N_{2}$ -fixation.
N, P and K are referred to as critical elements for crop plants as they easily become deficient in soil due to higher plant requirement and repeated cultivation.
Enzyme nitrogenase, which is required to fix atmospheric $N_{2}$ , is active in the presence as well as absence of oxygen.

Nitrogen fixing bacteria- anabaena - are found in the plant ______Azolla leavesCycas corolloid rootsAnthoceros bodyAll of these

Nitrogen fixing bacteria- anabaena - are found in the plant ______
Azolla leaves
Cycas corolloid roots
Anthoceros body
All of these