Question

Movement of ions or molecules in a direction opposite to that of prevailing electro chemical gradient is known as 

(a) diffusion 

(b) active transport 

(c) pinocytosis 

(d) brownian movement

Answer 1

Correct option: (b) active transport

Explanation:

Active transport involves movement of ions against concentration gradient involves the expenditure of energy. Diffusion involves the movement of solute particles from region of higher concentration to a region of lower concentration. Pinocytosis is cell drinking. Brownian movement is the random to and fro movement of atoms and molecules.