Question

Which of the following is/are true for plant growth regulators?

• A. Plant growth regulators are also known as phytohormones.
• B. The regulators are signal molecules produced within the cell.
• C. They occur in extremely low concentrations.
• D. Phytohormones are required in high concentrations.

Answer 1

Answer: (A), (B), (C)

The correct options are
A Plant growth regulators are also known as phytohormones.
B The regulators are signal molecules produced within the cell.
C They occur in extremely low concentrations.

Plant growth regulators or phytohormones are chemical messengers that stimulate the plants for proper growth and development. They are produced by the plant cells in very low amounts. Even at low concentrations, phytohormones can bring about profound physiological changes in plants.