A graph titled "Average plant height (cm) vs. Concentration of sodium phosphate (mg/L)" shows an upward-sloping line that reaches a maximum value and then stays there over the remainder of the graph. What noticeable trend from this graph might be used to make a conclusion?

A.
Average plant height increases with an increase in the concentration of sodium phosphate until the plants reach a maximum possible height.

B.
Average plant height causes an increase in the concentration of sodium phosphate.

C.
Average plant height is not affected by the concentration of sodium phosphate.

D.
Average plant height is halved every time the concentration of sodium phosphate is doubled until all of the sodium phosphate has been used up.

A. Average plant height increases with an increase in the concentration of sodium phosphate until the plants reach a maximum possible height.

Explanation:

The graph in the attachment section portrays the average height of plants (cm) on the y-axis plotted against the concentration of sodium phoshate (mg/L) on the x-axis. Based on the observation of the result in the graph, an increase in the concentration of phosphate caused an increase in the average plant height (as depicted by the upward-sloping line).

However, the plant's average height didn't go beyond 35cm despite an increase in concentration of phosphate. This is because the plants has reached a maximum possible height i.e. a height climax. Hence, they cannot grow taller than 35cm no matter the amount of external nutrients (sodium phosphate) supplied.

Therefore, the noticeable trend that can be used to make a conclusion is that average plant height increases with an increase in the concentration of sodium phosphate until the plants reach a maximum possible height.

A.

Explanation:

Average plant height increases with an increase in the concentration of sodium phosphate until the plants reach a maximum possible height.

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