The word "photo" means light.
"Synthesis" means putting together. The word
photosynthesis means putting together with light. Plants contain
chlorophyll. Plants take in water and nutrients from the soil
through tiny hairs on the roots. The water and nutrients are
transported through the root hairs to the roots, and then are drawn up the
stem through tubes that are arranged in bundles. There are two
different kinds of tubes: phloem and xylem. Xylem tubes carry the
needed water and nutrients up the stem to the leaves where photosynthesis
takes place. Phloem tubes carry sugars down from the leaves.
These sugars are stored in the lower stem and roots.
There is a layer of cells found just below the top
surface of a leaf. These cells contain chloroplasts.
Chlorophyll is found in the chloroplasts. When sunlight shines on
the top of a leaf the light energy is trapped by the chlorophyll.
This energy is stored for later use.
Air passes in through tiny holes on the bottom surface
of the leaf. Molecules of carbon dioxide from the air reach the
cells where chlorophyll has trapped energy from sunlight. This
trapped energy turns the carbon dioxide into a variety of sugars and
The sugars move down the phloem tubes and will be stored
as starch or sugar in other parts of the plant. The cells use this
stored food to grow and do their work. Examples of stored sugars we
gather and eat from plants include apples, oranges, plum, and
grapes. Examples of stored starches include potatoes and corn.
We eat many plants that provide us with their stored starch and
sugar. Just like plants we convert this stored food into energy for
Directions: Answer the questions about
photosynthesis means putting together with
carry the needed water and nutrients up the plant's stem to the leaves.
carry sugars down from the leaves.
A layer of cells found just below the top surface of a
Plants turn carbon dioxide into a variety of sugars and
Which of the following are examples of stored sugar?
oranges, and pears
Which of the following are examples of stored starch?