Microbes as Biofertilisers

The video tutorial explains the types and benefits of fertilizers, focusing on biological options like manures and biofertilizers. It details various manures such as farmyard, compost, and green manure, and highlights the advantages of biofertilizers, including their eco-friendliness and cost-effectiveness. The tutorial also covers bacterial biofertilizers like Rhizobium, mycorrhizal associations between fungi and plants, and the role of cyanobacteria in agriculture.

What are the main types of manures mentioned in the video?

• Liquid, solid, and gaseous

• Organic, inorganic, and synthetic

• Farmyard, compost, and green

• Chemical, biological, and synthetic

Which of the following is NOT an advantage of biofertilizers?

• They reduce dependence on chemical fertilizers

• They are expensive

• They are eco-friendly

• They restore soil fertility

Which bacteria form a symbiotic relationship with leguminous plants?

• Azospirillum

• Nostoc

• Azotobacter

• Rhizobium

What is the primary function of mycorrhizal fungi in plant roots?

• Drawing minerals from the soil

• Fixing atmospheric nitrogen

• Decomposing organic matter

• Solubilizing phosphorus

Which type of mycorrhiza forms a sheath over the root surface?

• Ectomycorrhiza

• Endomycorrhiza

• Cyanobacteria

• Vesicular arbuscular mycorrhiza

Which cyanobacteria is symbiotic with the water fern Azolla?

• Oscillatoria

• Anabaena azollae

• Tolypothrix

• Nostoc

What is the role of cyanobacteria in paddy fields?

• Solubilizing phosphorus

• Fixing atmospheric nitrogen

• Decomposing organic matter

• Increasing soil pH