Fungal filaments form a network around the young roots or they penetrate the root cells: This is correct. Mycorrhizae are categorized into ectomycorrhizae (form a network/sheath around the root) and endomycorrhizae (penetrate the root cells).

Fungal hyphae absorb ions and water for the plant: This is correct. The hyphae have a large surface area that extends into the soil to absorb water and minerals (particularly phosphorus) for the plant.

Roots provide sugar and N-containing compounds to the fungal partner: This is correct. It is a symbiotic relationship where the fungus receives carbohydrates (sugars) and nitrogen-containing compounds from the host plant's photosynthesis.

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