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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. ... 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...

  4. ..., 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