Mycorrhizae

1. Are plant parasites
2. Is a mutualistic relationship
3. Is a type of lichen
4. Supply phosphates

2. Is a mutualistic relationship

4. Supply phosphates

Mycorrhizae is a mutualistic relationship between certain fungi and plant roots. So, option 2 is correct. Mycorrhizae fungi form a symbiotic association with plant roots, benefiting both the fungus and the plant. The fungus provides the plant with increased nutrient absorption capabilities, especially phosphates, as mentioned in option 4. In return, the plant supplies sugars and other organic compounds to the fungus. Mycorrhizae are not plant parasites, as mentioned in option 1. Lastly, mycorrhizae are different from lichens, which is a symbiotic association between fungi and green algae or cyanobacteria, so option 3 is incorrect.