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The organisms are interdependent. They interact with one another for various purposes, and such a relationship is called symbiosis. Plants show symbiosis with algae, bacteria, fungi, and many other organisms.

Mycorrhizae is one of the symbiotic associations of plants and fungi. Mycorrhizae can develop in two forms ectomycorrhiza and endomycorrhiza.

In Ectomycorrhiza form, the fungus produces hyphae around the root, and in endomycorrhiza form, hyphae are formed inside the root cells. Hyphae increase the surface area of absorption and allow the maximum intake of water and nutrients from the root.

Therefore, hyphae of fungus play a major role in the mutualism of fungi and plants to provide nutrients.

Thus, the given option is true.

Roots do not have chloroplasts. Roots receive sugars from the vascular tissue, such as phloem.

Therefore, roots do not receive sugars from mycorrhizae.

Thus, the given option is false.

The atmospheric nitrogen is converted into ammonia by soil bacteria. The soil bacteria such as Azotobacter show mutualism with legumes and provide nitrogen to the plants.

Therefore, mycorrhizae do not convert nitrogen as ammonia.

Thus, the given option is false.

The plants that parasitize the neighboring plants are known as parasitic plants. The root-like structure is called haustoria. This tube-like structure absorbs the water and nutrients from the host plant.

Therefore, mycorrhiza does not parasitize the neighboring plants. It lives on the roots of the host plant.

Thus, the given option is false.