Answer: Plant roots.
- A Insect larvae
- B Bacteria in soil
- C Plant roots
- D Bird nests
Correct answer: C. Plant roots
Explanation: Mycorrhizae are mutualistic associations between fungi and plant roots, helping the plant absorb nutrients more efficiently.
Exponential growth produces an ever-steepening J-curve with no limit, an unrealistic long-term model; logistic growth produces an S-curve that levels off at the carrying capacity K, as growth rate (K−N)/K shrinks to zero once resources are fully used.
Concept context
How organisms interact with abiotic factors and respond to stress, plus population attributes, growth models, and interspecific interactions such as predation, competition, and mutualism.