How is pollentube elongation facilitated?
a. Pollen tube growth relies onchemical signals released by the pollen grain.
b. Pollentube elongation will occur as long as the pistil provides moisture and energy.
c. Chemical cues from female tissues help guide pollen tube growth, but the identity of these chemicals is not
known.
d. All the details of the chemical interactions between the pollen tube and pistil tissue have been elucidated and
are well-described.
e. Pollentube elongation occurs only in the absence of chemical cues from the female tissues.
ANSWER: c
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