Question

Which of the following statement about plant hormones is not true?

• A. Each naturally occurring hormone has a specific chemical structure.
• B. Hormones are among the principal internal regulators of plant growth.
• C. Responses to plant hormones may be observed in nearly any part of a plant.
• D. All known growth regulators of plant activities are chemicals produced naturally by plants.

Answer 1

The correct option is D All known growth regulators of plant activities are chemicals produced naturally by plants.

For each known type of plant hormone, there are both naturally occurring as well as synthetic hormones.

So, the correct option is 'All known growth regulators of plant activities are chemicals produced naturally by plants '.