- Self - sterility or incompatibility
- Protogyny and protandry
- Presence of special structure that attract agent of pollination
johnmulu answered the question on May 9, 2017 at 05:07
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Date posted: May 8, 2017. Answers (1)
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Date posted: May 8, 2017. Answers (1)
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Date posted: May 8, 2017. Answers (1)
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Date posted: May 8, 2017. Answers (1)