Question

key
■ height
▲ number of buds
eighteen days into experiment 2, how many buds did the daylily in pot a have?
○ 6
○ 9
○ 13
○ 15

Explanation:

Locate 18 days on the x-axis, then find the corresponding value for the "number of buds" (red triangle line) at this time point. The line shows 7 buds, which matches the option 6? No, correction: the red triangle at 18 days aligns with 7, but the closest option is 6? Wait, no, recheck: the right y-axis for buds, at 18 days, the triangle is at 7, which is closest to 6? No, no, the graph's right axis: 0,2,4,6,8,10,12,14. The triangle at 18 days is at 7, which is between 6 and 8, but the only option matching the graph's marked trend (from 15 days at 7, 18 days same, 21 days at 8) is 6? No, wait, no, the option 6 is the correct match as the graph's value is ~7, but the options have 6 as the closest. Wait, no, re-express: the graph shows at 18 days, the number of buds is 7, which is closest to the option 6 (the other options are too high).

Answer:

6