#facts #science #ncertscience the invisible living world of microorganisms around us

We can categorise the microorganisms into different categories, such as protozoa, fungi, bacteria, some algae, and more. Some bacteria, such as Rhizobium, form the swollen regions called nodules and live in them. Roots of certain legumes, such as beans, peas, and lentils have root nodules that contain Rhizobium bacteria. These bacteria trap nitrogen from the air and make it useful for the plants. This helps plants grow better without chemical fertilisers. That is why farmers grow legumes in rotation with other crops. This naturally increases the nitrogen in the soil and keeps it healthy for the next crop.

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