Search results
Results from the WOW.Com Content Network
Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. The smaller of these, the microspore , is male and the larger megaspore is female. Heterospory evolved during the Devonian period from isospory independently in several plant groups: the clubmosses , the ferns including the arborescent ...
In sociology, heterogamy refers to a marriage between two individuals that differ in a certain criterion, and is contrasted with homogamy for a marriage or union between partners that match according to that criterion. For example, ethnic heterogamy refers to marriages involving individuals of different ethnic groups.
Exemplifying Differentiation and System Theory, this photographic mosaic may be perceived as a whole/system (a gull) or as a less complex group of parts.. Talcott Parsons was the first major theorist to develop a theory of society consisting of functionally defined sub-systems, which emerges from an evolutionary point of view through a cybernetic process of differentiation.
During the Devonian period several plant groups independently evolved heterospory and subsequently the habit of endospory, in which the gametophytes develop in miniaturized form inside the spore wall. By contrast in exosporous plants, including modern ferns, the gametophytes break the spore wall open on germination and develop outside it.
According to Parsons, social systems rely on a system of language, and culture must exist in a society in order for it to qualify as a social system. [4] Parsons' work laid the foundations for the rest of the study of social systems theory and ignited the debate over what framework social systems should be built around, such as actions ...
Social institution – Any persistent structure or mechanism of social order governing the behaviour of a set of individuals within a given community. The term "institution" is commonly applied to customs and behavior patterns important to a society, as well as to particular formal organizations of government and public services.
At the micro level, social status and social roles are the most important components of social structure. Microsociology forms an important perspective in many fields of study, including modern psychosocial studies, conversational analysis and human-computer interaction. Microsociology continues to have a profound influence on research in all ...
Manifest functions are the consequences that people see, observe or even expect. It is explicitly stated and understood by the participants in the relevant action. The manifest function of a rain dance, according to Merton in his 1957 Social Theory and Social Structure, is to produce rain, and this outcome is intended and desired by people participating in the ritual.