Q. Consider the following statements:
1.The gradual and fairly predictable change in the species composition of a given area is called ecological succession.
2.The entire sequence of communities that successively change in a given area are called sere(s).
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C
Notes:

Explanation: An important characteristic of all communities is that their composition and structure constantly change in response to the changing environmental conditions.

  • This change is orderly and sequential, parallel with the changes in the physical environment.
  • These changes lead finally to a community that is in near equilibrium with the environment and that is called a climax community.
  • The gradual and fairly predictable change in the species composition of a given area is called ecological succession.
  • During succession some species colonies an area and their population become more numerous whereas populations of other species decline and even disappear.
  • The entire sequence of communities that successively change in a given area are called sere(s).

Source: Science NCERT