Photosynthesis PowerPoint Notes

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Photosynthesis PowerPoint Notes

Visible light is a small band within a very broad electromagnetic spectrum Chloroplasts capture sunlight energy for photosynthesis.

How does a tiny seed grow into a massive tree? Where did all of that mass come from? In the 1600s, a Flemish scientist named Jan Van Helmont (1580?

1644) conducted an important experiment. He grew a willow tree in a carefully _______ amount of _______. He noticed that the mass of the_________ barely changed while the mass of the ________ greatly ___________. He concluded that the extra mass came from ___________, not from the soil. Later experiments carried out by other scientists showed that _________ use ________ __________ (from the ________) and _________ to make a simple ____________ (glucose) and _________. So the tree's mass comes from _________ and _________! This chemical reaction (photosynthesis) takes place only in the presence of _________.

The Sun provides Earth with a steady source of light. Visible light is part of a collection of waves

known as the ________________ ___________. Light is a ___________, like a ripple on a pond. ___________ can be described by their ____________ (the length from peak to peak), and their ___________. Your eyes see sunlight as ___________

light, but it is really made up of different

___________ of light. A clear ___________ can split white light into a rainbow of color. Light waves have very ___________ wavelengths. They range from 800 nm (___________ light) to 400 nm (___________ light). One nanometer (nm) is equal to one-billionth of a meter!

Color is how we experience the energy of light.

All of the colors of ___________ light have different ___________. Red light has the ___________ energy and violet light has the ___________ energy. As we move through the rainbow from red to violet, the energy of the light ___________.

How is a plant cell similar to solar cells found in calculators?

A solar calculator has solar cells that convert ___________ energy into ___________ energy. The electrical energy powers the calculator. A plant cell has _______________ that work much like solar cells found in calculators. Chloroplasts also convert ___________ in a process called ____________. Plant cells then store this energy from the sun in the form of ___________. Photosynthesis is a ___________ reaction that takes place in the chloroplasts of plant cells. During photosynthesis, plants use the energy of sunlight to produce energy-rich molecules called ___________ (ex. glucose). In photosynthesis, plants take in ___________ ___________ and ___________ and release ___________ and ___________ wastes.

Photosynthesis ? Color and label the process of photosynthesis on the diagram

Why are most plants green?

_____________ is found inside the _____________ of plant cells. Chlorophyll is the main _____________ used in photosynthesis. A pigment is a molecule that _____________ some colors of light and _____________ others. Plants need ___________ and _____________ light to grow. Chlorophyll absorbs mostly blue and red light, and reflects _____________ light. This is why most plants look _____________.

Why don't plants absorb all colors of light? The reason is the same reason you wear light-colored clothes when it's hot outside. Like you, plants must reflect some light to avoid absorbing too

much _____________ and ________________. Also, certain colors of visible light have just the right _____________ of

energy to make photosynthesis occur. Infrared light has too

_____________ energy to make photosynthesis occur.

Ultraviolet light has more energy but would cause other

_____________ _____________.

Why do leaves change color? In some parts of the world, the leaves of some plants, such as sugar maple trees, turn brilliant red or gold

in the _____________. Chlorophyll _____________ other plant pigments during the spring and summer. In the autumn, photosynthesis _____________ down. Chlorophyll _____________ down; and red, orange, and yellow _____________ in the leaves are revealed!

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