How do biofertilizers increase the fertility of the soil?
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Solution and Explanation
Step 1: Biofertilizers are natural substances that contain living microorganisms, such as bacteria, fungi, and algae, which enhance soil fertility.
Step 2: These microorganisms improve soil health by fixing nitrogen, decomposing organic matter, and promoting the availability of essential nutrients for plants. For example, nitrogen-fixing bacteria, such as Rhizobium, form symbiotic relationships with legume plants, converting atmospheric nitrogen into a form that plants can use.
Step 3: Biofertilizers help in reducing the need for chemical fertilizers, making them an eco-friendly alternative that improves soil structure and biodiversity.
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Mention the events related to the following historical dates:
\[\begin{array}{rl} \bullet & 321 \,\text{B.C.} \\ \bullet & 1829 \,\text{A.D.} \\ \bullet & 973 \,\text{A.D.} \\ \bullet & 1336 \,\text{A.D.} \\ \bullet & 1605 \,\text{A.D.} \\ \bullet & 1875 \,\text{A.D.} \\ \bullet & 1885 \,\text{A.D.} \\ \bullet & 1907 \,\text{A.D.} \\ \bullet & 1942 \,\text{A.D.} \\ \bullet & 1935 \,\text{A.D.} \end{array}\]
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