Stoma

(Plural: stomata). Microscopic pores in the leaf epidermis, which allow the passage of carbon dioxide, oxygen, and water vapour. The size of the pores is controlled by guard cells, which can close them completely, if necessary. Stone fruits

Fruits of the botanical family Rosaceae that contain a single hard seed, called a stone, pit, or pip. The term includes plums, cherries, greengages, peaches, apricots, almonds, and sloes. See also: Pome fruits. Strain

In a taxonomic sense, a strain is a subdivision of a species , often defined in terms of a physiological or parasitism criterion. Straw

The dried stems and leaves of a cereal or pseudo-cereal crop. Straw is used mainly as bedding for farm animals and it is a major component of farmyard manure. Mechanisation has greatly reduced the demand for straw bedding, and dwarf varieties have greatly reduced the supply. Strawberry

See: Fragaria ananassa. Striga spp.

These tropical and sub-tropical species , known as witch weed, are members of the family Scrophulariaceae, and they are semi-parasitic, often causing considerable damage to maize, sorghum, and other crops. The plants contain some chlorophyll and they damage their hosts mainly by robbing them of water. The seeds are minute, and are produced in huge numbers. They can remain dormant in the soil for years, and they germinate only in the presence of roots of a suitable host. Scientists at IITA have bred maize with horizontal resistance to Striga. Style

The stalk that supports the stigma. Stylet

In a zoological context, a stylet is the piercing mouthpart of an insect.

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