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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

1. Hydrilla
2. Yucca
3. Viola
4. Banana

Correct answer: Yucca

Solution

Yucca and yucca moths have an obligate mutualistic relationship: the moth pollinates the flowers, and its larvae develop in the seeds. Because each depends on the other for successful reproduction, neither can complete its life cycle without the other.

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