Plants Often Use Changes in Day Length (PhotoperioD) to Trigger

question 28

Multiple Choice

Plants often use changes in day length (photoperioD) to trigger events such as dormancy and flowering. Which of the following best explains why day-neutral plants are more common in the tropics than in temperate zones?

• A) In the tropics there is little photoperiodic change during the year.
• B) Warm temperature in the tropics denatures phytochrome pigments.
• C) The biological clock runs faster in the warm tropics.
• D) Precipitation change is more predictable than photoperiodic change during the year.

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