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  1. ...male and female parts, right? If a plant only produce one sex, how can they cross pollinate ? 2009-12-30 19:50:24 補充: If male and female cones are...

    分類:科學及數學 > 生物學 2010年01月03日

  2. ..., well beyond their natural range. However, since lavender cross - pollinates easily, there are countless variations within the species. ...

    分類:教育及參考書 > 教學 2009年12月03日

  3. ..., the flowers open and remain receptive to insect cross pollination during the day; if this is not accomplished, the flowers self pollinate as they are closing. Self pollination, or more generally...

    分類:科學及數學 > 生物學 2006年11月22日

  4. ... Saguaro can only be fertilized by cross -pollination -- pollen from a different cactus. The sweet nectar...and insects, which in acquiring the nectar, pollinate the Saguaro flower. Unlike the Queen...