Question

The most effective light for stomatal opening is

• A. Yellow
• B. Green
• C. Red
• D. Blue

Answer 1

The correct option is D Blue

Light is an important factor for stomatal opening, in dim light or in the night usually the stomata will be closed. When the light intensity increases, the stomata open. Blue and red light stimulate the stomatal opening. Among this, blue is the most effective light for the opening of stomata, it is perceived by phototropins that promote the increase in the solute concentration of guard cells. It also increases the phototropic response.

So, the correct answer is option D.