玉米、花生光合速率图形的比较：
如图是夏季晴朗的白天，玉米和花生净光合速率的变化曲线，据图分析：
(1)这两者中最可能起源于热带的植物是__________。
(2)在9：30-11：00之间，花生净光合率下降的原因是__________导致__________过程减缓。
(3)一天中玉米有机物积累量最多的时刻是__________。
(4)在18：30时，玉米能产生ATP的细胞器是__________。
(5)植物的绿色细胞依赖光照，吸收O2和放出CO2的过程，称为光呼吸，CO2抑制光呼吸而促进光合作用，在9：30-11：00之间，光呼吸较强的是__________。
(6)根据本题信息结合光合作用的影响因素分析：将花生与玉米套种(两行玉米之间种植花生)实现双丰收的原理：__________。此外，花生还有与其(填种间关系)的根瘤菌，收获花生后可以提高土壤的肥力。
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