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

list three constants for this experiment.

Explanation:

Constants are factors kept unchanged to isolate the effect of the independent variable (hours of daylight). The experiment mentions using tobacco plants, 200ml daily water, and a 3-month observation period as fixed variables.

Answer:

1. Type of plant (tobacco plants)
2. Daily water amount (200ml)
3. Observation duration (three months)