Home
Class 12
BIOLOGY
Successions that occur on soils or areas...

Successions that occur on soils or areas which have recently lost their community are reffered to as

A

primary successions

B

secondary successions

C

lithoseres

D

priseres.

Text Solution

Verified by Experts

The correct Answer is:
B

Secondary succession (=subsere) is the biotic succession that occurs in an area which become secondarily bare due to the destruction of community previously present there. Secondary succession starts from previously built up substrata with already existing living matter. the action of any external force, such as a sudden change in climatic factors, biotic intervention, fire, etc. had resulted in the destruction of previous community. Thus, area became devoid of living matter. The action of any external force, such as a sudden change in climatic fators, biotic intervention, fire etc. had resulted in the destruction or previous comunity. Thus, area became devoid of living of previous community. Thus, area became devoid of living matter but its substratum, instead of primitive, is built up. It has organic matter so is biologically fertile and thus, the successions are comparatively more rapid.
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion: Primary succession occurs over a primarlly bare area where there was no living matter from the very beginning Reason: During primary succession, reproductive structures of the previous occupants give rise to a new seral community as soon as the conditions become favourable.

Living differentiated cells which have otherwise lost the capacity to divide, can regain the power of division under certain conditions. This phenomenon is termed as

Assertion: Secondary succession always involves a predictable sequence of species and ends up with the same climax community as existed prior to the disturbance. Reason: A pond cannot be considered as a self sustained ecosystem as it does not possess all the structural and functional components which work as a unit in an ecosystem.

Transgenics have provided many pharamaceuticals in their milk, for treatment of diseases. Which of the following has not been a successful story ?

Given diagram illustrates an evolutionary tree. Which of the following statements can be deduced from the given evolutionary tree? (i) The ancestral eukaryotes were anaerobic. (ii) All eukaryotes were anaerobic. (ii) All eukaryotes possess mitochondria. (iii) Eubacteria and Eukaryota have a common ancestor whereas Archebacteria have a unique and independent origin. (iv) Mitochondria and chloroplasts have similar genomes. (v) Mitochondria are presents in plants, animals and fungi. (vi) chloroplasts and mitochondria arose asendosymbionts. (vii) Fungi and animals lost chloroplasts during evolution.

Which of the following statements regarding biodiversity hotspots are incorrect? (i) High endemism (ii) High level of species richness (iii) Total number is 34 in the world (iv) Five of these occur in India (v) High alien species invasion (vi) Cover less than 2% of the earth's land area, but if properly conserved, they can reduce extinctions by about 30% (a) (i) and (ii) (b) (iv) and (v) (c) iv), (v) and (vi) (d) (iii), (iv), (v) and (vi)