Answers

2015-04-12T15:04:08+05:30
Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinators.
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2015-04-17T06:55:10+05:30
No all flowers do not produce nectar. the flowers produce nectar because of pollination. but  pollination of some flowers is different.hence we can say all flowers dont produce nectar
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