Match the following columns:

Column I (Rhizobium sp.)	Column II (Crops)
a. R. lupini	1. Lupine group
b. R. trifoli	2. Clover group
c. R. japonicum	3. Soybean
d. R. mcliloti	4. Alfa-alfa

a. R. lupine in Lupine group. They can fix nitrogen from the atmosphere into ammonia via a rhizobium root nodule symbiosis, fertilizing the soil for other plants. This adaptation allows lupins to be tolerant of infertile soils and capable of pioneering change in barren and poor-quality soils.
b. R.trifoli in Clover group. Clover or trefoil are common names for plants of the genus Trifolium consisting of about 300 species of flowering plants.
c. R. japonicum and Soybean. Soybean plants to get their necessary dose of nitrogen, partner with bacteria called rhizobium japonicum which can convert atmospheric nitrogen into organic forms the plant can use.
d. R. mcliloti and Alfa alfa. R. mclloti is an aerobic, Gram-negative, and diazotrophic species of bacteria. S. meliloti are motile and possess a cluster of peritrichous flagella. S. meliloti fix atmospheric nitrogen into ammonia for their legume symbionts, such as alfalfa.