Two fusion events occur in double fertilization.

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Chapter 20, Problem 2MC

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Two fusion events occur in double fertilization.

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Double fertilization results in __________________________. a. a diploid zygote and triploid endosperm in each seed b. a spare sperm nucleus c. two diploid zygotes in every seed d. none of these answers is correct e. three diploid zygotes; one of the three will form will develop into a sporophyte embryo in a seed, one will die and the third will migrate out of the megasporangium and form a separate male plant

Fruits do not form in gymnosperms becausea. in gymnosperms, the seed is surrounded by the ovule.b. in angiosperms, the ovary is surrounded by the ovule.c. in gymnosperms, the ovule is surrounded by the ovary.d. in angiosperms, the ovule is surrounded by the ovary.

Answer the following questions: What is meant by “double fertilization”? What features of seeds and fruits have enabled angiosperms to become so widespread? What are the similarities and differences between cones and flowers?