Q. Movement among cells against concentration gradient is called
A) Osmosis
B) Active transport
C) Diffusion
D) Passive transport
Explanation
Active transport uses specific transporter proteins called pumps, which use metabolic energy (ATP) to move ions or molecules against the concentration gradient.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.