The male sperm cells are contained in pollen grains. The female egg cells are contained in the ovary. Sex among the flowering plants involves two separate but related activities: pollination and fertilization. Pollination is the transfer of pollen from the male organ of a flower to the female organ of a flower. The male organ known as an anther generates the pollen grains containing male genetic material. In most flowers, anthers are located at the tip of a stalk known as a stamen.
Also called Bravais lattice, crystal lattice, space lattice. Crystallography. an arrangement in space of isolated points (lattice points) in a regular pattern, showing the positions of atoms, molecules, or ions in the structure of a crystal. 5. Mathematics.
crystal crysÂ·tal (krÄ­s'tÉl) n. A homogenous solid formed by a repeating, three-dimensional pattern of atoms, ions, or molecules and having fixed distances between constituent parts. A mineral, especially a transparent form of quartz that has a crystalline structure and is often characterized by external planar faces.