本题目来源于试卷: Continuity and Change D.12 Climate Change，类别为 IB生物学
[单选题]
Which of the followiy2rsc;0hy;:h; ;bpzc utc6 d6w 1m aaya(bk1(almtpno.8 il *ls + ujyxfr7)) ng are triggered by photoperiod?
I. Bird migration
II. Bird nesting
III. Hatching of eggs
A. I only
B. I and III only
C. I and II only
D. I, II and III
参考答案: A
本题详细解析:
Choice A is correct because only Statement I is correct, as many bird species rely on the changing day length as a signal for the timing of their migratory journeys. Bird nesting (Statement II) is primarily influenced by factors such as food availability and temperature, and the hatching of eggs (Statement III) is influenced mainly by the warmth of the nest and embryonic development. Therefore, Choices B, C and D are incorrect.
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