Hydrangea plants produce flowers that can be either blue or pink in color. The flowers will be blue if they are grown in acidic soil (having a pH of 5.5 or less) or pink if they are grown in soil with a neutral to basic pH of 6.5 and up. What can be concluded from this information?

The correct answer would be - Hydrangea plants depend on the concentration of some element which is affected by the acidic or basic nature of the soil.

Explanation:

Hydrangeas plants produce two different type of flowers blue and pink. The color of the plant depends on the pH of the soil or the acidic or basic nature of the soil. If the pH of the soil is acidic which means 5.5 or less the color of the flower would be blue and if it is near or above the 6.5 flowers would be pink.

So, it is clear that the concentration of any element that affected by the pH of the soil is responsible for the color of the flowers, in this case, it is found that the concentration of aluminum ions (Al+++) in the soil. When the soil is alkaline less concentration aluminum available for the plant and more available to the plant when the soil is acidic.

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