问题描述：
1.how many p___do plants have?2.roots grow b__ground.3.l___make food for the plant.
4.the s__carries the water from the roots to the leaves and flowers.
5.the seed of the rice plant feed b__of people.
6.theseed will g__into a plant.
7.
4.the s__carries the water from the roots to the leaves and flowers.
5.the seed of the rice plant feed b__of people.
6.theseed will g__into a plant.
7.
问题解答：
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