Directions : In the following questions a statement of assertion (A) ...
Assertion (A): Rhizobium leguminosarum is a symbiotic bacterium found in the root nodules of leguminous plants.
Reason (R): They have the ability to fix atmospheric nitrogen.
Explanation:
Assertion (A) states that Rhizobium leguminosarum is a symbiotic bacterium found in the root nodules of leguminous plants. This statement is true. Rhizobium leguminosarum is a type of bacteria that forms a mutualistic symbiotic relationship with leguminous plants. The bacteria colonize the root nodules of these plants and provide them with fixed nitrogen in exchange for carbohydrates.
Reason (R) states that Rhizobium leguminosarum has the ability to fix atmospheric nitrogen. This statement is also true. Rhizobium leguminosarum is a nitrogen-fixing bacterium, which means it has the ability to convert atmospheric nitrogen (N2) into a form that plants can use, such as ammonia (NH3) or nitrate (NO3-). This process is known as nitrogen fixation and is essential for the growth and development of leguminous plants.
Explanation of the relationship between Assertion (A) and Reason (R):
The reason (R) provides a correct explanation for the assertion (A). Rhizobium leguminosarum is found in the root nodules of leguminous plants because it has the ability to fix atmospheric nitrogen. The bacteria form a symbiotic relationship with the plants, providing them with fixed nitrogen while receiving carbohydrates in return. This mutualistic interaction benefits both the bacteria and the plants.
Conclusion:
Both the assertion (A) and reason (R) are true, and the reason (R) is the correct explanation of the assertion (A).
Directions : In the following questions a statement of assertion (A) ...
Rhizobium leguminosarum is a symbiotic bacterium that serves as a biofertilizer. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as a nutrient.