population expanded? (A) Selection for niche diversification (B) Development of

Question

population expanded? (A) Selection for niche diversification (B) Development of more efficient attack behavior (C) Further emigration when carrying capacity was reached (D) Genetic drift (E) Postzygotic mating factors 70. Which of the following would be the most dependable environmental signal that a plant in a temperate ecosystem could use to initiate flowering at the correct time of the year? (A) Circadian rhythm (B) Photoperiod (C) Changing air temperature (D) Fluctuations in abscisic acid levels (E) Changing amounts of precipitation 16. Explains the flowering of certain species at particular ti (A) Allelopathy (B) Circadian rhythm

Explanation / Answer

Answer: B. Photoperiod

Explanation:

The photoperiod is likely a much more reliable cue for plants with regard to the correct time to flower.

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