Which of the following is an agent of pollination of grasses?

Wind is the agent of pollination of grasses. Grasses are flowering plants, and like many other flowering plants, they require pollination in order to reproduce. Pollination is the transfer of pollen from the male reproductive structure (the stamen) to the female reproductive structure (the pistil) of a flower. In the case of grasses, the flowers are typically small and inconspicuous, and they lack the showy petals and bright colors that attract insect or mammal pollinators. Instead, the male flowers produce large quantities of lightweight, dry, and dusty pollen, which is easily carried by the wind to nearby female flowers. This is called wind pollination, and it is a common method of pollination in grasses and other plants that live in open, exposed environments. Therefore, the correct option to the question is "Wind" as it is the main agent of pollination of grasses. While insects, water, and mammals can also be agents of pollination for certain types of plants, they are not typically involved in the pollination of grasses.