AP BIOLOGY

Detailed explanation-1: -Legumes improve soil fertility through the symbiotic association with microorganisms, such as rhizobia, which fix the atmospheric nitrogen and make nitrogen available to the host and other crops by a process known as biological nitrogen fixation (BNF).

Detailed explanation-2: -Elevated CO2 Increases Nitrogen Fixation at the Reproductive Phase Contributing to Various Yield Responses of Soybean Cultivars. Nitrogen deficiency limits crop performance under elevated CO2 (eCO2), depending on the ability of plant N uptake.

Detailed explanation-3: -Legume crops such as beans, peanuts and soy can fix nitrogen from the air, and flourish on nitrogen-deficient soils. To do so, they need help from Rhizobium bacteria. These special bacteria stimulate the growth of nodules on the roots of leguminous plants.

Detailed explanation-4: -In this symbiotic relationship, legumes form root nodules where the rhizobia bacteria transform atmospheric nitrogen into ammonia. When the legumes uptake fixed nitrogen, they form green leaves (rich in chlorophyll). This improves the plant’s photosynthetic capability making the plant grow faster and healthier.