Biology
Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 39, Problem 4TY

How does double fertilization occur in flowering plants?

  1. a. The two sperm in a pollen tube fertilize the two egg cells present in each female gametophyte.
  2. b. One of the two sperm in a pollen tube fertilizes the single egg in a female gametophyte, and the other fuses with the two nuclei present in the central cell.
  3. c. Two sperm, one contributed by each of two different pollen tubes, fertilize the two egg cells in a single female gametophyte.
  4. d. Two sperm contributed by separate pollen tubes enter a single female gametophyte; one of the sperm fertilizes the egg cell, and the other fertilizes the central cell.
  5. e. None of the above is correct.
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