Question

according to the video, why is phosphorus often difficult for plants to absorb from soil?
a. because phosphorus evaporates quickly from the soil surface
b. because phosphorus mostly exists in forms plants cannot use directly
c. because plants do not have roots deep enough to reach phosphorus
d. because phosphorus is toxic to most plants

what role do arbuscular mycorrhizal fungi (amf) play in helping plants get phosphorus?
a. they photosynthesize and produce extra phosphorus for the plant
b. they extend hyphal networks that explore more soil than roots alone
c. they repel other microbes that compete for phosphorus
d. they convert phosphorus into nitrogen for plant uptake

which biochemical tools do these fungi produce to make soil phosphorus available to plants?
a. chlorophyll and cellulose
b. phosphatases and organic acids
c. proteases and lipids
d. nitrifying bacteria and antifeedants

how does the fungi-plant partnership benefit broader ecosystems, according to the video?
a. it reduces soil microbial activity and lowers fertility
b. it isolates phosphorus for a single plant only
c. it supports nutrient cycling and benefits many plants in the community
d. it increases the need for chemical fertilizers

Explanation:

1. Most soil phosphorus is in insoluble, unavailable forms for direct plant uptake, making absorption hard.
2. Arbuscular mycorrhizal fungi form extensive hyphal networks that expand the[LLM SSE On Failure]

Answer:

1. B. Because phosphorus mostly exists in forms plants cannot use directly
2. B. They extend hyphal networks that explore more soil than roots alone
3. B. Phosphatases and organic acids
4. C. It supports nutrient cycling and benefits many plants in the community