A pollen tube is a tubular structure produced by the male gametophyte (pollen grain) of seed plants when it germinates at the top of the stigma. It’s elongation is an integral stage in the plant life cycle as it brings the sperm nuclei towards the ovule and causes to happen fertilization. …

The steps in the biosystematic investigation are as follows A sampling of taxon and its population and cytological study of the chromosome of many populations within geographical races, species, and genera; differences in chromosome number, morphology, and behavior of meiosis indicated genetic differences. Determination of the ability of the different …

Species is the basic & smallest whit of classification which is represented by binomial nomenclature according to ICBN. Two individuals with maximum similarities which can interbred among themselves & produce fertile individual & also can exchange gene are called Species. A Species concept is a concept that is the production …