There are two main Types of Trees based on their leaves, deciduous and evergreen; 1  Deciduous trees are trees whose leaves loose their green coloring and turn orange, red or brown before they are shed at the end of the growing season, generally in autumn. 2  Evergreen trees carry their leaves throughout the year.
A catalyst is a chemical species that alters the rate of a chemical reaction without undergoing any type of change. Such catalysts that slow down a reaction are called negativ â¦ e catalysts or poison.
Enzymes act as a catalyst to increase the efficiency of chemical reactions without being use up of themselves.Enzymes are made up of â¦ Proteins.Without participation of enzymes reaction will proceed slowly and making life impossible. 2 people found this useful.