Which Statement Best Reflects the Current Understanding of Pollen Tube

question 21

Multiple Choice

Which statement best reflects the current understanding of pollen tube elongation?

• A)It is not even known if pollen tube growth uses chemical signals or is completely random.
• B)Pollen tube elongation will occur as long as the pistil provides moisture and energy.
• C)While it is known that chemical cues from female tissues help guide pollen tube growth, the identity of these chemicals is not known.
• D)Nearly all of the details of the chemical interactions between the pollen tube and pistil tissue are known.

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