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Stems are at the second story
of the tree. The stem, or commonly known as trunks for trees, have an outer
covering called a bark. The trunk helps the tree to transport the water,
nutrients and minerals from the roots to various parts of the tree.
Leaves are another important part to plants. They have a green substance
called chlorophyll that helps the tree make food, unlike other organisms. This
process of making food is called photosynthesis. In order to carry out
photosynthesis, the tree needs light and carbon dioxide (CO2). When they do
that, they are actually cleaning the air by giving out oxygen (O2).
The flowers
come next. Flowers are usually the most beautiful part of the tree-they
serve a very important purpose. They develop into fruits (see next
paragraph), and for non-fruiting trees, they help to disperse the seeds (for
example the Flame of The Forest).
Fruits are
next. Fruits come from flowers which develop into fruits. First, the petals
of the flower wither and drop. The remaining part (called the floral disc)
grows bigger until it becomes a fruit. Most fruits are edible, and others
are not. Some trees (like papaya tree) drop their fruits and when they
break, their seeds are thrown around.
Trees are
very useful to man. Trees provide shade and paper, something we cannot do
without. Trees provide wood and for some species, fruits. Trees also catch
dust particles that pollute the air. Finally, they keep the air cool. A
whole forest is actually equivalent to many, many air-conditionals running
at a time!
However,
the amount of trees is cutting down gradually due to deforestation, leading
to global warming. To prevent this, we should plant more trees to protect
our environment.
-written by Ryan Yeo on 10 May 2008.

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