Bio-fertilizers are living organisms which help in increasing the fertility of soil. It involves the selection of beneficial micro-organisms that help in improving plant growth through the supply of plant nutrients. These are introduced to seeds, roots, or soil to mobilize the availability of nutrients by their biological activity. Thus, they are extremely beneficial in enriching the soil with organic nutrients. Many species of bacteria and cyanobacteria have the ability to fix free atmospheric nitrogen. Rhizobium is a symbiotic bacteria found in the root nodules of leguminous plants. Azospirillium and Azotobocter are free living nitrogen-fixing bacteria, whereas Anabena, Nostoc, and Oscillitoria are examples of nitrogen-fixing cyanobacteria. Bio-fertilizers are cost effective and eco-friendly.
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This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Bio-fertilizers are living organisms which help in increasing the fertility of soil. It involves the selection of beneficial micro-organisms that help in improving plant growth through the supply of plant nutrients. Thes...
Step-by-step explanation:
• Bio-fertilizers are living organisms which help in increasing the fertility of soil
• It involves the selection of beneficial micro-organisms that help in improving plant growth through the supply of plant nutrients
• These are introduced to seeds, roots, or soil to mobilize the availability of nutrients by their biological activity
• Thus, they are extremely beneficial in enriching the soil with organic nutrients
• Many species of bacteria and cyanobacteria have the ability to fix free atmospheric nitrogen
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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