Question

The colored petals of some flowers indicate the presence of acid or base in a solution. Example of such flowers is:

• A. Hydrangea
• B. Petunia
• C. Geranium
• D. All of the above

Answer 1

The correct option is D All of the above

Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to the division Thallophyta, and is commonly used as an indicator.
There are many other natural materials like red cabbage leaves, turmeric, colored petals of some flowers such as Hydrangea, Petunia, and Geranium, which indicate the presence of acid or base in a solution. These are called acid-base indicators or sometimes simply indicators.

Hence the correct option is D.