Gametes are the genetically different kind of cells which are produced as a result of meiosis. Meiosis is a reductional division in which the chromosomes are reduced to half. Genetic variation in the gametes is due to crossing over between two non-sister chromatids of a homologous chromosomes during meiosis.
Woody plants have a tough, waterproof outer layer of cork cells commonly known as bark, They provide structural support, mainly to the stem and leaves.
