Transport in Plants Question 7
7. Movement of ions or molecules in a direction opposite to that of prevailing electrochemical gradient is known as [2000]
(a) diffusion
(b) active transport
(c) pinocytosis
(d) brownian movement
Show Answer
Answer : b
Hints & Solutions
(b) 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.
