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| - A paddy, according to Wikipedia, can be where any kind of semi-aquatic crop is grown, but I'll assume you're referring to a rice paddy. Usually, the rice is germinated in a seedbed and later transplanted to a flooded field (paddy). This tends to be labour intensive. A more automated way is to plant the seeds directly in the field and later flood it. Rice may germinate while submerged in water. Plants normally do not do this because of the tendency for these environments to be very oxygen poor. Rice, apparently, is able to cope with this through fermentation. Fermentation is normally a very innefective way of acquiring energy from sugars, but rice is able to do this. After germination, the rice plant may transport oxygen from its shoot when it emerges from the water, down to its submerged parts and roots. This isn't normally done in land plants.
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