The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by digestive enzymes. In chemical digestion, enzymes break down food into the small molecules the body can use.igestion begins in the mouth with the secretion of saliva and its digestive enzymes. Food is formed into a bolus by the mechanical mastication and swallowed into the esophagus from where it enters the stomach through the action of peristalsis.
The stigma is generally in the center of the flower and stands up on the style, taller than the surrounding anthers. It usually has a gelatinous or visceral appearance, which is slightly damp and furry.
Each of the parts of the calyx of a flower, enclosing the  petals and typically green and leaf like. sepals are leaf-like parts found at the base of a flower. Sepals protect the flower while the flower is developing from a  bud. Petals are big and brightly coloured to attract insects for pollination. Sepals are green, so they can conduct photosynthesis. Thay make food for the flower. Flowers are the râ¦eproductive part of a plant because they produce fruit which contains seeds.