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.
Biological catalysts that are proteins are called enzymes. Enzymes bring the substrates together to form the enzyme-substrate complex, which leads to the generation of t â¦ he products of the reaction. 14 people found this useful. Jonathan Givens. 1 Contribution.