[题1]下图表示野外松树(阳生植物)光合作用强度与光照强度的关系。其中的纵坐标表示松树整体表现出的吸收CO2和释放CO2量的状况。请分析回答:(1)当光照强度为b时,光合作用强度________________。(2)光照强度为a时,光合作用吸收CO2的量等于呼吸作用放出CO2的量。如果白天光照强 [Question 1] The following figure shows the relationship between photosynthesis intensity and light intensity of wild pine (positive plants). Among them, the ordinate indicates the condition of the pine tree as a whole showing absorption of CO2 and release of CO2. Please analyze and answer: (1) When the light intensity is b, the photosynthesis intensity ________________. (2) When the light intensity is a, the amount of CO2 absorbed by photosynthesis is equal to the amount of CO2 emitted by the respiration. If the daylight is strong