19.
									
										Which of the following is incorrect ?
									
								
															
														
																									
										A:
											All solutions have lower water potential than pure water.  
									
																										
										B:
											More the solute molecules in a solution, more is the solute potential. 
									
																										
										C:
											  Water potential is equal to solute potential for a solution at atmospheric pressure
									
																										
										D:
											Pressure potential is negative in xylem and helps in upward movement of water in plants 
									
																								 
							
																
									The answer is:
										B