单选题
According to the passage, the size of a male cycad cone directly influences which of the following?
A、
The arrangement of the male cone's structural elements
B、
The mechanism by which pollen is released from the male cone
C、
The degree to which the ovules of female cycads are accessible to airborne pollen
D、
he male cone's attractiveness to potential insect pollinators
E、
The amount of pollen produced by the male cone
【正确答案】
E
【答案解析】
提交答案
关闭