A pair of homologous chromosomes , or homologous , is a set of one maternal and one paternal chromosome that join with each other inside a cell during fertilization . Homologs have identical genes at the same locus where they provide points along each chromosome that enable a pair of chromosomes to align correctly with …
An ecosystem refers to the collective community of organisms living and interacting with their environment in a specific environment. An ecosystem diagram is a diagram that shows the direction of flow of energy and nutrients in a specific habitat system. Energy and nutrients both flow from biotic to abiotic components of the ecosystem. An ecosystem …
xiang is most commonly used as a collective term for the parts of a flower thatproduce the ovule and eventually Develops into fruits and seeds . Gynoecium is the innermost whorl of a flower ; It has (one or more) pistils and is usually surrounded by the pollen-producing reproductive organs , the stamens , which …
Selaginella is the only genus of vascular plants in the family Selaginellaceae , the spikemosses or lesser clubmosses . This family is distinguished from the Lycopodiaceae (Clubmoss), which have scaly-leaves with a ligule and two types of spores . They are sometimes included in an informal paraphyletic group known as ” fern allies “. S. …
Heterospory is the production of spores from sporophytes of two different sizes and sexes of land plants . The smaller of these, the microspore , is the male and the larger the megaspore is the female. Heterospory evolved during the period from the Devonian to isospory : clubmosses , arborescent horsetails , [1] and progymnosperms, …
Alternation of Generations (also known as metagenesis or heterogenesis ) [1] is a type of life cycle that occurs in plants and algae in the Archaeplastida and Heterokontophyta that separate haploid sexual and diploid asexual stages. In these groups, a multicellular haploid gametophyte with n chromosomes substitutes with a multicellular diploid sporophyte composed of n …
Embryophyte or ground plants are the most familiar group of green plants that form vegetation on Earth. Embryophyte is a clade within Phragmoplastophyta , a larger clade that also includes many groups including green algae ( Charophyceae and Coleochaetales ), and within this larger clade embryophyte ( m b r i f aɪ t s …
a gametophyte is one of two alternating multicellular stages in the life cycle of plants and algae . It is a haploid multicellular organism that develops from a haploid spore that contains a set of chromosomes. The gametophyte is the sexual stage in the life cycle of plants and algae. It develops sex organs that …
Microspore are the spores of ground plants that develop into male gametophytes , while megaspores develop into female gametophytes. [1] The male gametophyte gives rise to sperm cells, which are used to form a zygote for fertilization of the egg cell . Megaspores are structures that are part of the alternation of generations in many …
Come on friends today we will know about Androecium. The stamen ( plural stamens or stamens ) is the pollen – producing reproductive organ of a flower . Collectively, the stamens make up the androecium. Morphology and Terminology The stamens usually consist of a stalk called a filament and an anther containing microsporangia . The …