20.
									
										What is correct about Calvin cycle ? 
									
								
															
														
																									
										A:
											It occurs in mesophyll cells of C3 plants only
									
																										
										B:
											 It occurs in bundle sheath cells of C4 plants only 
									
																										
										C:
											It occurs in mesophyll cells of both C3 and C4 plants
									
																										
										D:
											 It occurs in mesophyll cells of C3 plants and bundle sheath cells of C4 plants 
									
																								 
							
																
									The answer is:
										D