The Brazil Nut Tree, Bertholletia Excels, Is Native to Tropical

question 26

Multiple Choice

The Brazil nut tree, Bertholletia excels, is native to tropical rain forests of South America. Scientists have discovered that the pale yellow flowers of Brazil nut trees cannot fertilize themselves and admit only female orchid bees as pollinators. If a female orchid bee has just left a Brazil nut tree with nectar in her stomach, and if she visits another flower on a different Brazil nut tree, what is the sequence in which the following events should occur?

• A) pollen transfer, pollen tube emerges from pollen grain, pollen tube enters micropyle, double fertilization
• B) pollen transfer, pollen tube enters micropyle, pollen tube emerges from pollen grain, double fertilization
• C) pollen tube emerges from pollen grain, pollen transfer, pollen tube enters micropyle, double fertilization
• D) pollen tube enters micropyle, pollen tube emerges from pollen grain, pollen transfer, double fertilization

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