which of the following has the wormicidal properties? azolla anabaena nostoc azotobacter
Answers
There are many examples of plants, bacteria and algae that have formed intimate symbiotic associations or "marriages" with each other. Divorce is practically nonexistent in these marriages, and separations may result in the death of one or both partners. In some cases the relationship is decidedly one-sided, with only one partner actually benefiting. These relationships are often termed parasitic, especially when the non-benefiting partner is actually harmed by the relationship. In other marriages the relationship is mutually beneficial. Algae and fungi live together in an association called lichen, and nitrogen-fixing bacteria live symbiotically inside the root nodules of legumes. But one of the most fascinating of all plant marriages involves a tiny aquatic water fern (Azolla) and a microscopic filamentous blue-green alga or cyanobacterium (Anabaena azollae). They grow together at the surface of quiet streams and ponds throughout tropical and temperate regions of the world