Q: Which equation best represents the process by which saprophytic fungi obtain energy from dead organic matter?

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + \text{energy}$$

Question 1

Which of the following best describes the ecological role of fungi in most terrestrial ecosystems?

Accepted Answer

They are main decomposers, breaking down dead organic matter.

Question 2

Which statement correctly describes the relationship in a lichen?

Accepted Answer

A fungus and an alga or cyanobacterium form a mutualistic association.

Question 3

Endophytic fungi are important in plant biology because they:

Accepted Answer

Live inside plant cells and often provide benefits to the host.

Question 4

Which structure is primarily responsible for the growth and nutrient absorption in most fungi?

Accepted Answer

Hyphae

Question 5

A scientist discovers a fungus that forms a dense network of hyphae inside plant roots, facilitating nutrient exchange. This is most likely an example of:

Accepted Answer

Mycorrhizae

Question 6

Which of the following best describes the difference between ectomycorrhizae and arbuscular mycorrhizae?

Accepted Answer

Ectomycorrhizae form on the outside of plant roots, while arbuscular mycorrhizae penetrate into root cells.

Question 7

Which fungal structure is a modified hypha that allows the fungus to extract nutrients from host cells?

Accepted Answer

Haustorium

Question 8

A plant infected by a fungus that forms haustoria is most likely experiencing:

Accepted Answer

Parasitism, where the fungus extracts nutrients from the plant.

Question 9

Which of the following is NOT a characteristic of fungi?

Accepted Answer

Ability to photosynthesize

Question 10

If a fungus forms a symbiotic association with the roots of a vascular plant, what is this relationship called?

Accepted Answer

Mycorrhizae

Question 11

Which equation best represents the process by which saprophytic fungi obtain energy from dead organic matter?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 12

Which of the following best explains why mycorrhizal associations are important for plant health in nutrient-poor soils?

Accepted Answer

Fungi increase the surface area for water and mineral absorption.

Question 13

A researcher observes that a fungus is living inside the leaves of a plant without causing disease. This fungus is best classified as:

Accepted Answer

An endophyte

Question 14

Which of the following is a correct description of mycelium?

Accepted Answer

A mass of hyphae that forms the main body of a fungus

Question 15

Which of the following is true about the role of fungi in mutualistic relationships?

Accepted Answer

Fungi can help plants absorb nutrients and water.

Question 16

Which of the following best describes the function of arbuscular mycorrhizal fungi?

Accepted Answer

They penetrate into plant root cells to facilitate nutrient exchange.

Question 17

A farmer notices that crops grown in fields with abundant mycorrhizal fungi require less fertilizer. This is most likely because:

Accepted Answer

Mycorrhizal fungi increase the plant's ability to absorb soil nutrients.

Question 18

Which of the following is a plausible consequence if all saprophytic fungi were removed from an ecosystem?

Accepted Answer

Dead organic matter would accumulate, disrupting nutrient cycling.

Question 19

Which of the following is a correct sequence of events in the formation of a mycorrhizal association?

Accepted Answer

Fungal hyphae contact plant roots, penetrate root cells, and exchange nutrients.

Fungi: Structure, Ecology, and Symbiosis (Chapter 17 Study Notes)

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