Q. Cilia are
A) Short (5-10$\mu$m) hair-like narrow protoplasmic process
B) With sweeping or pendular movements
C) More numerous
D) All of the above
Explanation
A cilium has the appearance of a sharp-pointed straight or curved hair that projects 5-10$\mu$m. Many cilia often project from a single cell. The cilium moves forward with a sudden rapid whiplike stroke 10-20 times per second than it moves backward slowly to its original position.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.