Plants supply man with food clothing, and shelter- his most important needs.
Many of our most useful medicines are also made (1)_________plants. In addition, plants add beauty and pleasure to our lives. Most people enjoy the smell of flowers, the sight field of waving grain, and the quiet of a forest. Not (2)_______plants are helpful to man. Some species grow in fields and gardens as weeds that choke off useful plants. Tiny hits of pollen from (3)_______plants cause such (4)_________as asthma and hay fever. Other plants destroy millions of dollars (5)_______of crops yearly.