AP BIOLOGY

Detailed explanation-1: -The given statement is true. Yes, the root nodules of leguminous plants have nitrogen-fixing symbiotic bacteria.

Detailed explanation-2: -The bacteria live inside the root nodules where they trade nutrients with the plants. The bacteria provide nitrogen and the plant provides sugars from photosynthesis. Not all plants can make nodules, so this type of symbiosis is restricted to only certain plants.

Detailed explanation-3: -All plants under cultivation, except legumes (plants with seed pods that split in half, such as lentils, beans, peas or peanuts) get the nitrogen they require through the soil. Legumes get nitrogen through fixation that occurs in their root nodules, as described above.

Detailed explanation-4: -Final answer:-The given statement is false.

Detailed explanation-5: -Inside the nodules are cells filled with Rhizobium bacteria. These bacteria fix atmospheric nitrogen (N₂) by converting it into ammonia compounds (NH4OH). Excess ammonia is expelled into the soil and plant tissues surrounding the nodule.