Bacterial Interactions with Legume Plants

The video explains nitrogen fixation, focusing on the role of bacteria in converting atmospheric nitrogen into forms usable by plants. It highlights the symbiotic relationship between legumes and soil bacteria, which form nodules on roots. Some bacteria live freely in the soil, converting nitrogen into ammonia and other compounds. The process involves bacteria infecting root hairs, forming nodules, and exchanging nutrients with the plant.

What type of bacteria live in nodules on the roots of legume plants?

• Aerobic bacteria

• Anaerobic bacteria

• Soil bacteria

• Pathogenic bacteria

What do the bacteria in the nodules convert atmospheric nitrogen into?

• Ammonia

• Proteins

• Carbon compounds

• Nitrites and nitrates

What do free-living bacteria in the soil convert atmospheric nitrogen into?

• Oxygen

• Nitrites and nitrates

• Ammonia, amino acids, and proteins

• Carbon compounds

Which genus of bacteria infects root hairs to form nodules?

• Clostridium

• Rhizobium

• Azotobacter

• Nitrobacter

What do the plants provide to the bacteria in the nodules?

• Nitrogenous compounds

• Water

• Shelter and carbon compounds

• Minerals