Biology subjects hold 50 per cent of the weightage out of other subjects in NEET examinations. This examination also enables students to be eligible to take up seats in medical courses. Therefore, it is of the coveted medical tests. You can score higher marks in NEET examinations in the biology subject by clear understanding of the chapters and thorough preparation. Biology is a very diverse subject which requires you to have knowledge of theories, descriptions, discoveries, diagrams, definitions, explanation of differences and relations. NEET exam papers include objective types of questions from all the topics included in the syllabus. Ecological Succession is one such chapter and we will have a brief overview of this chapter in this section. You can also practice some solved examples based on the chapter followed by the overview.
The process of change in the species structure of a community in an ecosystem over time is known as ecological succession. However, the time scale considered in the case of ecological succession is quite long. It may range from decades to millions of years. Mostly, when we talk about ecological succession, we intend to look at the steady alteration in the species in a specific area with regard to the changing environment. As, a matter of fact, the biotic components of the ecosystem are constantly and very slowly changing in order to sustain and adapt to the changing environment. As a result, this phenomenon is unforeseeable and unpreventable. Maintaining a state of equilibrium in the ecosystem is the sole intent of this phenomenon.
Ecological succession is of two types- Primary Succession and Secondary Succession. The primary succession is the one that begins in lifeless areas, where the ecosystem was previously uninhabitable and the first life forms occurred with the passage of time. On the destruction of the primary ecosystem, the secondary succession occurs.
So, secondary succession is the recolonization of the previously destroyed ecosystem. It begins with the emergence of small plants, followed by larger ones and continues till the climax community arrives.
We will now look at some solved MCQs on this chapter-
1. The intermediate developmental phase in an ecological succession is known as-
2. The final stable community in an ecological succession is called --------------
3. The process in which the successful establishment of species in a new area takes place is called
4. Which of these is true about secondary succession?
It follows the primary succession
It starts in a bare rock
It is similar to primary succession except that it has a relatively slower pace
takes place on a deforested site
5. Which of the following is not climax vegetation?
6. Which one of these is the characteristic of an early seral community?
Open mineral cycling
High species diversity
Narrow niche specialization
Low community production
7. An ecological succession on sand is-------------
8. The pioneering community in a xerosere are
9. The correct order of basis processes involved in succession is
invasion >> stabilization >> completion and co action >> reaction >> nudation
nudation >> stabilization >> completion and co action >> invasion >> reaction
invasion >> nudation >> completion and co action >> reaction >> stabilization
nudation >> invasion >> completion and co action >> reaction >> stabilization
10. Which of the following is not true about ecological succession?
The food chain relationships become more complex
The species diversity increases as the succession proceeds
Ecological succession is a random process
Role of decomposers become very important
11. An ecological succession thats initiated on a large sand deposits or deserts is known as
12. The development of bare land or area that did not possess any life form before is called
13. The conversion of a pond to a climax forest community is an example of
None of the above
14. The fauna in the ecosystem undergoes a qualitative change during which of these stages?
Development of herbs and grass stage
Development of moss stage
Development of crustaceans stage
None of the above
15. Which of the following is not true about a climax community?
It has a wide diversity of species
The vegetation is intolerant of changing environments
Individuals in the climax stage are replaced by other individuals of the same kind
The life or growth forms indicate the climatic type in an ecosystem
16. Autogenic succession or plant succession can be caused by
Changes in the soil
Accumulation of organic matter
Change in pH pf the soil due to previous growth of plants
All of the above