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...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...
..., 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...
... 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...
cross-pollinating 相關
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