Question

use the following information to answer items 5 through / two groups of students conduct an experiment to determine whether lettuce plants grow better under red, blue, or green light. the groups collect the following:
group 1:
color of light | weight of leaves in grams
green light | 32
red light | 63
blue light | 115

group 2:
color of light | weight of leaves in grams
green light | 14
red light | 31
blue light | 72

given this data, which conclusion is the most accurate?

a) a highly intense green light is the best light color for growing plants such as lettuce.
b) the most effective color of light for growing lettuce plants is red, followed by green, then blue.
c) lettuce plants grow approximately twice as much under red light as green light, and approximately twice as much under blue light than red light.
d) the color of light does not have a significant impact on the growth of lettuce leaves.

Explanation:

Step1: Analyze Option A

Check the data for green light. In Group 1, green light gives 32g; in Group 2, 14g. Total for green: \(32 + 14 = 46\)g. Red light: Group 1 (63g) + Group 2 (31g) = \(63 + 31 = 94\)g. Blue light: Group 1 (115g) + Group 2 (72g) = \(115 + 72 = 187\)g. Green is not the highest, so A is wrong.

Step2: Analyze Option B

Order by total weight: Blue (\(187\)) > Red (\(94\)) > Green (\(46\)). So order is blue, red, green. B's order is wrong.

Step3: Analyze Option C

Red light total: \(94\)g, Green total: \(46\)g. \(94\div46\approx2\). Blue light total: \(187\)g, Red total: \(94\)g. \(187\div94\approx2\). So lettuce grows ~twice as much under red as green, ~twice as much under blue as red. C matches.

Step4: Analyze Option D

Blue, red, green have different totals (187, 94, 46), so color impacts growth. D is wrong.

Answer:

C. Lettuce plants grow approximately twice as much under red light as green light, and approximately twice as much under blue light than red light.