Biology Micro Organisms Part 12 (Microbes in Biofertilizers) Class 8 VIII | Summary and Q&A

TL;DR

Biofertilizers, such as nitrogen-fixing bacteria and symbiotic fungi, increase soil fertility without the harmful effects of chemical fertilizers.

Key Insights

• 🥺 Chemical fertilizers are made up of harmful chemicals that can harm soil ecosystems and lead to imbalances in soil pH and soil infertility.
• 🍄 Biofertilizers, such as nitrogen-fixing bacteria and symbiotic fungi, provide nutrients to the soil without causing harm to the environment.
• 🌱 Nitrogen-fixing bacteria form a symbiotic association with leguminous plants, supplying atmospheric nitrogen to the plants and increasing soil fertility.
• 🌱 Symbiotic fungi, called mycorrhiza, absorb phosphorus from the soil and transfer it to plants, promoting better plant growth and nutrient uptake.
• ❎ Biofertilizers enrich the soil with essential nutrients, such as nitrogen and phosphorus, without the negative impacts of chemical fertilizers.
• 👊 Biofertilizers can prevent the attack of disease-causing microorganisms and improve plant resistance to pathogens.
• 💚 Cyanobacteria, also known as blue-green algae, are examples of biofertilizers that fix atmospheric nitrogen and add organic matter to the soil.

Transcript

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Questions & Answers

Q: What are the disadvantages of chemical fertilizers?

Chemical fertilizers can harm soil ecosystems, animals that consume crops, and cause soil infertility and water pollution if used in excess.

Q: How do biofertilizers differ from chemical fertilizers?

Biofertilizers, such as nitrogen-fixing bacteria and symbiotic fungi, are living organisms that enrich the soil with nutrients without harming the environment.

Q: How do nitrogen-fixing bacteria act as biofertilizers?

Nitrogen-fixing bacteria, like Rhizobium, form a symbiotic association with leguminous plants, providing them with atmospheric nitrogen and increasing soil fertility.

Q: What role do symbiotic fungi play as biofertilizers?

Symbiotic fungi, known as mycorrhiza, absorb phosphorus from the soil and transfer it to plants, enhancing nutrient uptake and promoting better plant growth.

Summary & Key Takeaways

• Chemical fertilizers are harmful to the environment and can disrupt the soil ecosystem, cause imbalances in soil pH, and lead to the susceptibility of plants to diseases.

• Biofertilizers, such as nitrogen-fixing bacteria and symbiotic fungi, provide nutrients to the soil without causing harm to the environment.

• Nitrogen-fixing bacteria enrich the soil with nitrogen, while symbiotic fungi help in the absorption of phosphorus, resulting in better plant growth and development.