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Answer 1

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Answer 2

• All living organisms require food. Plants can make their food themselves but animals including humans cannot. They get it from plants or animals that eat plants. Thus, humans and animals are directly or indirectly dependent on plants
• Manures and fertilizers help in conserving and enriching the fertility of the soil. By growing plants again and again on the same soil, the soil becomes deficient in nutrients. Thus it is necessary to replenish the soil with these nutrients. That's why farmers add manures and fertilizers to the field.
• Nitrogenous fertiliser is not added in soil in which leguminous plants are grown because the nitrogen fixing bacteria reside in the root nodules of the leguminous plants. ... Hence the soil in which legumes are grown becomes rich in nitrogen and does not require nitrogenous fertilisers.
• Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobium. This relationship is particularly common in nitrogen-limited conditions. The Rhizobium convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides.

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