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1.下图甲是探究绿色植物光合作用速率的实验示意图,装置中的碳酸氢钠溶液可维持瓶内的二氧化碳浓度。该装置放在20℃环境中。实验开始时,针筒的读数是0.2 mL,毛细管内的水滴在位置X。30 min后,针筒的容量需要调至0.6 mL的读数,才能使水滴仍维持在X的位置。据此实验回答下列问题:
1. The lower panel A is an experimental schematic to investigate photosynthetic rates of green plants in which sodium bicarbonate solution maintains the carbon dioxide concentration in the bottle. The device is placed in a 20 ℃ environment. At the beginning of the experiment, the syringe reading was 0.2 mL and the water droplets in the capillary were at position X. After 30 minutes, the volume of the syringe needs to be adjusted to a reading of 0.6 mL to keep the water droplets in the X position. Based on this experiment to answer the following questions: