Question

a scientist observed that tobacco plants flower only at certain times of the year. she grew five tobacco plants and exposed each to light for a specific period of time each day. each plant received 200ml of water daily. she recorded the flower growth each week for three months. study the diagrams below which show the results of this experiment.
flower
flower
flower
bud
bud
10 hours
12 hours
14 hours
16 hours
18 hours
hours of daylight
the independent variable is
the dependent variable is

Explanation:

The independent variable is the factor manipulated by the scientist. Here, the scientist changes the daily light exposure time for each plant. The dependent variable is the outcome measured, which is the flower/bud growth (since it depends on the light exposure time).

Answer:

The independent variable is hours of daylight.
The dependent variable is flower/bud growth.