Definition of razor for English Language Learners. : a tool or device with a sharp edge that is used to shave or cut hair from the face, body, or head.
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.
Reptilian embryos are protected from desiccation by a leathery shell. Similarly, sporophytes of both gymnosperms and angiosperms protect embryos within ________, and they also protect male gametophytes against desiccation using ________.1. pollen grains; waxy cuticle 2. fruits; stamens 3. ovaries;...imilarly, sporophytes of both gymnosperms and angiosperms protect embryos within ________, and they also protect male gametophytes against desiccation using ________. 1. pollen grains; waxy cuticle. 2. fruits; stamens.