act科学 题目3.docx

Passage IIIA student performed 2 studies to investigate the factors that affect the germination of peony seeds.Study 1Peony seeds were placed in dry containers. Some of the containers were stored at 5°C for either 4, 6, 8, or 10?weeks. The temperature and time periods were defined as the?storage temperatureand the?storage period, respectively.The peony seeds were divided evenly so that there were 20?sets of 25?seeds. Twenty petri dishes were then prepared. Each contained damp paper. Each set of seeds was placed in a separate petri dish. Each petri dish was maintained at 1 of 4?temperatures for 30?days. The temperature and time periods were defined as the?germination temperature?and the?germination period, respectively. Table?1 shows the number of seeds that germinated in each dish.Storageperiod(weeks)Number of peony seeds that germinated when maintained at a germination temperature of:13°C18°C23°C28°C?0?4?6?810?0?0?3?715?0?2?82224?0?0?6182100001Table 1Study 2Peony seeds were placed in dry containers. The containers were stored at various temperatures for 10?weeks.The peony seeds were divided evenly so that there were 20?sets of 25?seeds. Twenty petri dishes were then prepared. Each contained damp paper. Each set of seeds was placed in a petri dish. The petri dishes were maintained at 1 of 4?temperatures for 30?days. Table?2 shows the number of seeds that germinated in each dish.Storagetemperature(°C)Number of peony seeds that germinated when maintained at a germination temperature of:13°C18°C23°C28°C?0?51015201516?0?0?024236?0?02121?4?0?011000Table 2Tables adapted from Joel Beller,?Experimenting with Plants. ?1985 by Joel Beller.In general, the results of Study 1 suggest that peony seeds that are placed in a petri dish containing damp paper are most likely to germinate when they are maintained at which of the following temperatures?A.?13°CB.?18°CC.?23°CD.?28°CSuppose another set of 25?peony seeds had been included in Study?2 and these seeds had a storage temperature