EVS Project on Symbiosis
Symbiosis
ENVIRONMENTAL STUDIES PROJECT
2013
SHIVAM AGRWAL
XII – COM –B
ROLL NO: 32
Index S.N | Topic | Page No. | Signature | 1) | Symbiosis -Introduction | 3-4 | | 2) | Objective | 4 | | 3) | Types of symbiosis | 5-9 | | 4) | Picture Gallery | 10 | | 5) | Conclusion and bibliography | 11-12 | |
Introduction
Symbiosis is close and often long-term interaction between two or more different biological species. In 1877, Bennett used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."
The definition of symbiosis is controversial among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any types of persistent biological interactions (i.e. mutualistic, commensalistic, orparasitic).
Some symbiotic relationships are obligate, meaning that both symbionts entirely depend on each other for survival. For example, many lichens consist of fungal and photosynthetic symbionts that cannot live on their own. Others are facultative, meaning that they can, but do not have to live with the other organism.
Symbiotic relationships include those associations in which one organism lives on another (ectosymbiosis, such as mistletoe), or where one partner lives inside the other (endosymbiosis, such as lactobacilli and other bacteria in humans or Symbiodinium incorals). Symbiosis is also classified by physical attachment of the organisms; symbiosis in which the organisms have bodily union is called conjunctive symbiosis, and symbiosis in which they are not in union is called disjunctive symbiosis.
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OBJECTIVE
Study on Symbiosis
Symbiosis can mainly be of 3 types :-
i. Mutualism ii. Commensalism iii. Parasitism
MUTUALISM
Mutualism is any relationship
ENVIRONMENTAL STUDIES PROJECT
2013
SHIVAM AGRWAL
XII – COM –B
ROLL NO: 32
Index S.N | Topic | Page No. | Signature | 1) | Symbiosis -Introduction | 3-4 | | 2) | Objective | 4 | | 3) | Types of symbiosis | 5-9 | | 4) | Picture Gallery | 10 | | 5) | Conclusion and bibliography | 11-12 | |
Introduction
Symbiosis is close and often long-term interaction between two or more different biological species. In 1877, Bennett used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."
The definition of symbiosis is controversial among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any types of persistent biological interactions (i.e. mutualistic, commensalistic, orparasitic).
Some symbiotic relationships are obligate, meaning that both symbionts entirely depend on each other for survival. For example, many lichens consist of fungal and photosynthetic symbionts that cannot live on their own. Others are facultative, meaning that they can, but do not have to live with the other organism.
Symbiotic relationships include those associations in which one organism lives on another (ectosymbiosis, such as mistletoe), or where one partner lives inside the other (endosymbiosis, such as lactobacilli and other bacteria in humans or Symbiodinium incorals). Symbiosis is also classified by physical attachment of the organisms; symbiosis in which the organisms have bodily union is called conjunctive symbiosis, and symbiosis in which they are not in union is called disjunctive symbiosis.
.
OBJECTIVE
Study on Symbiosis
Symbiosis can mainly be of 3 types :-
i. Mutualism ii. Commensalism iii. Parasitism
MUTUALISM
Mutualism is any relationship
Bibliography: I have collected my information from the following sources:- * www.google.com * www.wikipedia.com