Question

Differentiate between primary succession and secondary succession.

Answer 1

Primary seccession	Secondary seccession
(1) It occurs in biologically sterile area	(1) Occurs in an area which is biologically quite fertile
(2) Humus/organic matter is absent in the early stages	(2) Present from very begining.
(3) It begins on a soilless area.	(3) Occurs on a area having sufficient soil.
(4) It takes long time ie. 1000 years and more.	(4) It takes place in  lesser time 50-200 years.