The movement of a leaf blade on its petiole to keep the blade oriented perpendicular to the sun's rays throughout the day is facilitated by
A) bulliform cells.
B) motor cells.
C) tracheids.
D) passage cells.
E) laticifers.

Question

Quizplus · Accepted Answer

Motor cells are responsible for the movement of plant parts, such as the orientation of leaf blades to maximize photosynthesis by keeping them perpendicular to the sun's rays throughout the day. This movement is a type of tropism called phototropism, where plants grow or move in response to light.

The Movement of a Leaf Blade on Its Petiole to Keep