Hartig nets in soil produce by:

✅Explanation:
-Hartig net is a network of fungal hyphae that surrounds the root cells of plants in an ectomycorrhizal association. This network facilitates the exchange of nutrients between the fungus and the plant.

📌 Other Options Explanations:
-Option A: Rhizobium: Rhizobium bacteria form symbiotic relationships with leguminous plants, leading to the formation of root nodules. These nodules are involved in nitrogen fixation.
-Option C: Endomycorrhiza: Endomycorrhizae, also known as arbuscular mycorrhizae, penetrate the root cortical cells and form structures called arbuscules within the cells.