The uptake of small nutrient molecules from the environment is known as . 2. one of many filaments making up the body of a fungus is called a . 3. the densely branched network of fungal filaments is a . 4. a is a close association of fungi and plant roots that is beneficial to both. 5. an organism that derives its nutrition from a living host is called a .

1. Absorption; 2. Hypha, 3. Mycellium, 4. Mycorrhiza, 5. Parasite.

Explanation:

1. Absorption is the uptake of small nutrient molecules, usually dissolved in water, from the environment, for example from the soil solution.

2. A hypha is a thin filament, usually white or light-colored, making up the body of a fungus.

3. Many hyphae interconnected together comprise the body of a fungus, and is known as the mycelium.

4. A mycorhiza, a compound word from myco (fungus) and rhiza (root) refers to the symbiotic association between a specialized fungus and the roots on which it lives, and the association is beneficial for both, since the fungus obtains photosynthates (sugars) and the root gets minerals such as phosphorus, from the fungus.

5. A parasite is an organism that obtains its nutrients from another living organism which is called a host. This relationship benefits the parasite but commonly is detrimental to the host.