Plant growth group # location of light water per day hours of light per day amount of stem growth (mean) direction of growth 1 above plants 10 ml 8 4 cm upward 2 left of plants 10 ml 8 4 cm left 3 right of plants 10 ml 8 4 cm right gretta was interested in plant growth and conducted an investigation. she planted three groups of indoor plants and used lamps with bright bulbs to learn about the effects of light position on plant growth. she gave all three groups of plants the same amount of water and hours of light per day. the one difference between the three groups was the location of the lamps. for group 1, the lamp was placed directly above the plants; for group 2, to the left of them; and group 3, to the right. she observed and measured the plants’ growth for two weeks. gretta recorded some predictions before beginning her investigation. which of her predictions was supported by her data? a) the plants will grow in the opposite directions of the light sources. b) groups 2 and 3 will grow the same amount, and group 1 will grow the most. c) groups 2 and 3 will grow away from the lights, and group 1 will grow toward it. d) group 1 will grow straight up, while groups 2 and 3 will grow either left or right.