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Rhizobium supplies nitrogen to leguminous plants by


Agricultural ScienceWAEC SSCE

Question

Rhizobium supplies nitrogen to leguminous plants by

Options

A)
incorporating urea into their bodies
B)
fixing atmospheric nitrogen into the soil
C)
decomposing plant and animals remains
D)
decreasing the pH value of the soil

The correct answer is B.

Explanation:

Leguminous plants, such as beans, peas, and soybeans, have a special relationship with a type of bacteria called Rhizobium. These bacteria live in nodules on the roots of leguminous plants and help them obtain nitrogen, which is an essential nutrient for plant growth.

The question is asking how Rhizobium supplies nitrogen to leguminous plants.

Option A states that Rhizobium incorporates urea into their bodies. However, this is not correct. Urea is a form of nitrogen fertilizer that can be applied to plants, but Rhizobium does not use urea to supply nitrogen to leguminous plants.

Option B states that Rhizobium fixes atmospheric nitrogen into the soil, and this is the correct answer. Rhizobium has the ability to convert atmospheric nitrogen into a form that plants can use. This process is called nitrogen fixation. The bacteria take nitrogen gas from the air and convert it into a form of nitrogen that can be absorbed by the plant roots.

Option C states that Rhizobium decomposes plant and animal remains to supply nitrogen. While decomposition by other organisms can release nitrogen into the soil, Rhizobium does not rely on this process to supply nitrogen to leguminous plants.

Option D states that Rhizobium decreases the pH value of the soil. However, Rhizobium does not directly affect the pH of the soil. pH refers to the acidity or alkalinity of the soil, and Rhizobium primarily plays a role in nitrogen fixation.

In conclusion, Rhizobium supplies nitrogen to leguminous plants by fixing atmospheric nitrogen into the soil. This symbiotic relationship between the bacteria and the plants is important for the growth and development of leguminous crops.

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