Question

Nodules with nitrogen fixing bacteria is present in
A. Cotton
B. Gram
C. Wheat
D. Mustard

Answer 1

Hint: The nitrogen-fixing bacteria aid in the conversion of atmospheric nitrogen to ammonium molecules, which the plant can use. This is referred to as nitrogen fixation. There are a variety of creatures engaged in the process.
Nitrogen-fixing bacteria come in two varieties. Free-living nitrogen-fixing bacteria and symbiotic nitrogen-fixing bacteria are the two forms of nitrogen-fixing bacteria. In the root nodules of leguminous plants, symbiotic bacteria can be found. In exchange for the plant, they produce nitrogen and receive nutrients.

Complete answer:
Option A: Non-leguminous crops such as paddy, millets, cotton, tomato, cabbage, and other monocotyledonous crops should use this non-symbiotic nitrogen-fixing bacterium.
So option A is not correct.
Option B: Leguminous plants have root nodules in their roots. Leguminous plants, often known as common pulses, are members of the Leguminosae family. Only gramme is a leguminous crop among the alternatives.
So option B is correct.
Option C: Legumes get nitrogen from symbiotic nitrogen-fixing bacteria, whereas cereal crops like wheat and maize rely on fixed nitrogen in the soil to grow.
So option C is not correct.
Option D: Leguminous plants have root nodules in their roots. Leguminous plants, often known as common pulses, are members of the Leguminosae family. Only gramme is a leguminous crop among the alternatives. As a result, only 'Gram' should have root nodules.
So option D is not correct.

So option B is the correct answer.

Additional information:
The bacteria in Cicer arietinum's root nodules is Rhizobium, which is nonfilamentous. Mesorhizobium is a non filamentous bacteria that lives in the root nodules of Cycas revolute. Bradyrhizobium and Methylobacterium, both non-filamentous nitrogen-fixing bacteria, are found in the root nodules of Crotalaria juncea.

Note:
Martinus Beijerinck was the first to isolate a bacterium from leguminous plant root nodules in 1888. To begin, he named it Bacillus radicicola, which is currently classified as part of the Rhizobium genus. It is presently being employed in a number of studies that involve genetic mapping of Rhizobium with their symbiotic plants in order to boost plant yield without the usage of fertiliser.