30.(9 points) The CO2 compensation point of plants refers to the CO2 concentration in the environment when the photosynthetic rate is equal to the respiration rate due to the limitation of CO2. If it is known that the CO2 compensation point of A factory is greater than that of B factory, answer the following questions: There is an a/B network.
(1) Two normal plants, A and B, were placed in the same closed room and cultured in light under suitable conditions. After cultivation, it was found that the photosynthetic rate of the two plants decreased because of _ _ _ _ _ _ _ _ _ _ _ _ _.
(2) If the plant A is sealed in a room without O2, but other conditions are suitable, after a period of light cultivation, it is found that the aerobic respiration of the plant increases because of _ _ _ _ _ _ _ _ _ _ _ _.
The answer to this question is
(1) The photosynthetic rate is higher than the respiration rate, which leads to the decrease of co2 concentration and photosynthetic rate in the closed container. Greater than 0
(2) Because plants can carry out anaerobic respiration to produce co2 under anaerobic conditions, it can be supplied to plants for photosynthesis, and plants can carry out photosynthesis to produce oxygen, so that plants can carry out aerobic respiration. With the increase of co2 released by aerobic respiration and anaerobic respiration, plants produce more oxygen through photosynthesis, which increases aerobic respiration.
The above are some questions and answers of a comprehensive science examination paper in the national college entrance examination for reference only.