In flowering plants, the megagametophyte (also referred to as the embryo sac) is much smaller and typically consists of only seven cells and eight nuclei. This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.t consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms.
Late winter or early spring is the best time to begin spraying an apple tree. Using horticultural oil spray helps to destroy any insects and their eggs on the tree before new growth begins.
One of the most glorious spring flowering trees is the crab apple (Malus spp.). Best grown in regions with cold winters, this plant comes in a wide selection of flower colors, fall foliage tones and tiny fruit colors. In general, crab apple is a small tree with minimal annual pruning maintenance. Occasional pruning ...