Which of the following is an example of how photoperiodism affects plant ecosystems?

Which of the following is an example of how photoperiodism affects plant ecosystems?



A) Spinach, a long-day plant, flowers in the tropics because the days are so long.

B) Ragweed, a short-day plant, can't flower in the northern US because of the frost in the late summer months.

C) Cockleburs, a short-day plant, can live where there are long flashes of red light at night.

D) Chrysantheums, a short-day plant, bloom in the summer when the days are long.



Answer: B) Ragweed, a short-day plant, can't flower in the northern US because of the frost in the late summer months.


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