Plant hormones are chemical regulators that stimulate or inhibit growth depending on their concentration and type of tissue in which they are found. Based on the information in the graph, which is a correct conclution about plant hormones?
a
They stimulate maximum stem growth at low concentrations.
b
They stimulate maximum root and stem growth at different concentrations.
c
They most strongly inhibit root growth at low concentrations.
d
They stimulate maximum root growth and stem growth at the same concentration.
b
They stimulate maximum root and stem growth at different concentrations.
b
They stimulate maximum root and stem growth at different concentrations.
To find the correct conclusion about plant hormones based on the information provided in the graph, let's analyze the graph and consider the options given.
First, we should identify the trends shown in the graph. The x-axis represents the concentration of plant hormones, while the y-axis represents the growth of stems and roots. We should observe how the growth changes with the increasing concentration of hormones.
From the graph, we can see that both stem growth and root growth increase as the concentration of hormones increases up to a certain point. Beyond this point, when the concentration continues to increase, there is a decrease in growth for both stems and roots.
Now let's look at the options provided:
a) They stimulate maximum stem growth at low concentrations.
b) They stimulate maximum root and stem growth at different concentrations.
c) They most strongly inhibit root growth at low concentrations.
d) They stimulate maximum root growth and stem growth at the same concentration.
Based on the information observed in the graph, we can rule out option a as it suggests that maximum stem growth occurs at low concentrations, which contradicts the graph. Option b can also be ruled out as it suggests different concentrations for maximum root and stem growth, which is not supported by the graph.
Option c suggests that root growth is most strongly inhibited at low concentrations. While it is true that there is a decrease in root growth as hormone concentration increases, it is not the strongest inhibition observed. Therefore, we can conclude that option c is incorrect.
Option d suggests that maximum root growth and stem growth occur at the same concentration. From the graph, we can see that there is a point at which both stem and root growth are maximum, this supports option d.
Therefore, the correct conclusion about plant hormones based on the information in the graph is:
d) They stimulate maximum root growth and stem growth at the same concentration.