A student performed an experiment to examine how the growth of two plant species
ID: 270879 • Letter: A
Question
A student performed an experiment to examine how the growth of two plant species were affected by pH, the volume of water that they received, and the time of day when they were watered. 70 individual seedlings of species A and 70 seedlings of species B were grown for six weeks under the following conditions, with five plants from each species in each treatment group. The average heights for each treatment at the end of the experiment are given in the following table.
The two species have different optimal levels for which of the three variables?: *
(A) pH
(B) volume of water received
(C) volume and the time of day when they were watered
(D) pH, volume, and time of day
Species A Species B 3.2 37.6 62.3 48.4 20.6 42.4 31.5 2.7 4 10 13 10 20 40 80 160 4.9 19.2 56.2 65.1 2.6 12.4 38.9 45.6 21.5 Volume (mL) 12:00 am 7:00 am 12:00 pm 7:00 pm 62.3 61.1 66.7 65.3 20.3 21.8 18.4 19.3 TimeExplanation / Answer
Optimum pH for species A- 7
Optimum pH for species B- 7
Optimum volume of water required for species A- 80 ml
Optimum volume of water required for species B- 40 ml
Optimum time for watering for species A- 12.00 pm
Optimum time for watering for species B- 07.00 pm
The two species have different optimal levels for volume of water and time of watering.
Option C
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