Which of the following layers is the zone of eluviation or maximum leaching?

#Question id: 26941

#Unit 10. Ecological Principles

Which of the following population growth model represent the S-shaped growth curve?

#Question id: 17220

#Unit 7. System Physiology – Animal

#Question id: 10362

#Unit 6. System Physiology – Plant

Bacteria can convert atmospheric nitrogen into ammonia, Several form symbiotic associations with higher plants is given below;

               HOST PLANT                                                                          N-FIXING SYMBIONTS

A) Gunnera                                                                            i) Frankia

      B) Azolla                                                                                ii) Acetobacter

C) Leguminous                                                                     iii) Azospirillum

             D) Actinorhizal                                                                      iv) Nostoc

             E) Sugarcane                                                                         v) Anabaena

             F) Miscanthus                                                                       vi) Sinorhizobium

Which of the following combination with the host plants and n-fixing symbionts is CORRECT?

#Question id: 12200

#Unit 6. System Physiology – Plant

#Question id: 4591

#Unit 11. Evolution and Behavior

Which of the following factors could cause a surge in population size?