Hoarseness is a harsh, rough, raspy quality to the voice. Hoarseness is generally caused by irritation of, or injury to, the vocal cords. This trauma to the vocal cords leads to a change in the pitch of the voice. The voice box, or larynx, is the portion of the respiratory (breathing) tract containing the vocal cords that produce sound.
The gametophytes in seed plants, like pine trees and oak trees, are unisexual and microscopic. They are found inside part of the sporophyte and rely completely on the sporophyte for nutrients. For example, in a pine tree, the male gametophyte that produces sperm is found inside a pollen grain.lternation of generations is a type of life cycle found in all plants and some algae species. This process involves a multicellular diploid generation called a sporophyte and a multicellular haploid generation called a gametophyte.
The pollen grain is the male gametophyte. When pollination occurs and the pollen grain makes contact with the stigma (the apex of the pistil), the tube cell elongates its cytoplasm, forming the pollen tube that grows towards the ovary.The generative cell divides to form two sperm nuclei (male gametes), which then migrate through the pollen tube.3. A typical seed is composed of the embryo, endosperm and shell. Within seeds of angiosperms, there are one or two cotyledons (seed leaves, one in monocots, two in dicots). The endosperm is the tissue within the seed that has the function of nourishing the embryo.