Question

1. Which bacteria helps to enrich the soil with nitrogen
2. What is symbiosis?
3. Which manures do farmers mostly use?
4. How do saprophytes digest dead and decaying living
things?​

Answer 1

☆ Answer

• Certain bacteria can enrich the soil with nitrogen. These are nitrogen-fixing bacteria. For example, Azospirillum, Anabaena, Nostoc, Azotobacter, and Oscillatoria. 
• Symbiosis is the interaction between two different organisms living in close physical association. A pair of commensal amphipods living on a sponge stalk.

• Major sources of manures are:
• ▪︎Cattle shed wastes-dung, urine and slurry from biogas plants.
• ▪︎Human habitation wastes-night soil, human urine, town refuse, sewage, sludge and sullage.
• ▪︎Poultry Jitter, droppings of sheep and goat.
• ▪︎Slaughterhouse wastes-bone meal, meat meal, blood meal, horn and hoof meal, Fish wastes.
• Saprotrophic nutrition /sæprəˈtrɒfɪk, -proʊ-/ or lysotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed (dead or waste) organic matter. It occurs in saprotrophs, and is most often associated with fungi (for example Mucor) and soil bacteria.