Resources Beneath the Forest
Written by Studio AM.
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Many forest trees form close associations with fungi around their roots. Fine fungal threads spread through the soil, reaching spaces beyond the roots themselves. They can help a tree obtain water and nutrients, including phosphorus. The tree supplies carbon compounds, such as sugars made through photosynthesis, to the fungus.
One fungus can connect with more than one plant. These links are called common mycorrhizal networks. Researchers study them to understand how organisms influence one another below ground.
Some experiments have detected labelled carbon moving between plants. But detecting movement does not by itself show the exact route or how much the receiving plant benefits. Carbon may pass through a shared fungus, through the surrounding soil, or by other routes. Experiments need controls that help distinguish these possibilities.
How widely these networks operate in forests, and how important they are to tree growth, is less settled than the basic root-fungus association. A useful explanation separates three questions: is there a connection, what moves through it, and what effect does that movement have? Each question needs evidence of its own.
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Questions
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Question 1 of 4
Which statement best captures the passage as a whole?
The answer is B: Trees and fungi exchange resources, while the effects of shared networks require further evidence.
The passage explains the established root-fungus exchange, then separates connections, resource movement and benefits as distinct questions.
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Question 2 of 4
What does the tree give the fungus?
The answer is C: carbon compounds such as sugars made through photosynthesis
The tree supplies carbon compounds to the fungus. Fungal threads can help the tree obtain water and nutrients.
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Question 3 of 4
Labelled carbon is found in a neighbouring plant. What else would help establish a benefit from a shared fungal link?
The answer is A: Evidence of both the route taken and an effect on the receiving plant.
Finding carbon does not establish its route or benefit. Both need to be measured before claiming that a shared network helped the receiving plant.
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Question 4 of 4
What does 'settled' mean in 'less settled'?
The answer is D: agreed on and decided
The passage contrasts the familiar root-fungus association with questions still being investigated. 'Less settled' means less clearly established or agreed.
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