The climate determines the types of plants that can exist in each region, of vegetation is referred to as physiognomy. It constitutes general stature shape and life-forms of the species comprising the vegetation and actually the classification of vegetation types has been done on the basis of physiognomy. The species of a community can be grouped into several life-forms on [...]
Species differ in their environmental requirements. They also differ in respect of their tolerance to environmental fluctuations. The species occur in several morphological forms in different habitat conditions. Gote Turesson (1922), a Swedish worker conducted a series of experiments on variations within a Swedish plant species Plantago maritina. He collected a group of 20 or more individuals of the same [...]
Several eminent workers have prepared detailed schemes for a systematic study of autecological life histories. Stevens and Rock (1952) have suggested scheme for autecological life histories of herbaceous plants, Pelton (1951) has given a scheme for the study of autecological life histories of trees, shrubs and stem succulents; Curtis (1952) for vascular epiphytes, and Cooke (1951) for fungi and they [...]