Question

Which one of the following helps in absorption of phosphorus from soil by plants?

• A. Anabaena
• B. Glomus
• C. Rhizobium
• D. Frankia

Answer 1

The correct option is B Glomus

• Glomus helps in the absorption of phosphorus from the soil by plants. It is an arbuscular mycorrhiza. Phosphorus is a major nutrient required for the growth of plants.
• Anabaena is a genus of nitrogen-fixing blue-green algae, with beadlike or barrel-like cells and interspersed enlarged spores (heterocysts), found as plankton in shallow water and on moist soil. There are both solitary and colonial forms, the latter resembling a closely related genus, Nostoc. In temperate latitudes during the summer months, Anabaena may form water blooms.
• Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. In order to express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen.
• Frankia is a genus of nitrogen-fixing, filamentous bacteria that live in symbiosis with actinorhizal plants, similar to the rhizobia bacteria that are found in the root nodules of legumes in the Fabaceae family.
  So the correct option is B.