Photoperiodisms is the biological measurments of relative length of day and night. the plant in order to flowers require a certain relative length of days and night and in others activity of an organisms is called as photoperiod. the effects of photoperiods or relative length of day and night on growth and developments in plants is called photoperiodisms. its term was given by garner and allard (1920).
Higher plants are autotrophic organisms that can synthesize their organic molecular components out of inorganic nutrients obtained from their surroundings. for many mineral nutrients, like nitrogen , sulphur this process involves a complex of biochemical reactions and are among the energy requiring process involving absorption from the soil by the roots and incorporation into the organic compounds that are essential for growth and development.
Taxonomic data are the results generated from exhaustive taxonomic studies of plants either within a definite geographical area or world-wide taxonomic data includes : characterization and description of plant species illustration ( line drawings, photo plates) diagnostic tools or keys important notes concern with any studied taxonomic group (species/genus/family)
Extreme environments as defined by k. horikoshi and w. d. grant (1998) are “those environments in which a restricted range of organisms can grow, the majority of organisms are excluded”. extremophile is a term applied to any organism that has successfully adapted to extreme environments where it is difficult or impossible for other organisms to survive.
Post-harvest diseases are the disease that develop on the harvested plant produce. post-harvest fungal diseases are the diseases caused by fungi to the harvested plant produce. the harvested plant products may get infected on the way to storage or to market or even before final consumption. the plant produce may even get infected in the field but expression of symptoms may take place later, at any stage before final consumption.
An alien species is introduced by humans either intentionally or accidently outside of its natural adapted ranges dispersal potential . for a species to become invasive ,it must successfully out-complete native organisms ,spread through its new environment ,increase in population density and harm ecosystems .
Angiosperm represent one of the greatest terrestrial radiation, the oldest fossil date back from the early cretaceous followed by arise ecological dominant in many habitat before the end of the cretaceous.
Taxus baccata l.(european yew)is an evergreen and widespread shrub commonly used for ornamental landscaping.it belongs to the family taxaceae that includes five genera.it is a very slow growing evergreen gymnospermous tree belonging to the group of coniferous plants.
Angiosperms are seed-bearing vascular plants. their reproductive structures are flowers in which the ovules are enclosed in an ovary. they are found in almost every habitat from forests and grasslands to sea margins and desert. they display a huge variety of life forms including trees,herbs,submerged aquatics,bulbs and epiphytes.
A transgenic crop is a genetically modified organism. transgenic indicates transfer of genes that has occurred using recombinant dna technology. generally a transgenic crop contains one or more genes that have been inserted artificially either from an unrelated plant or from different species.