Photosynthesis PowerPoint Notes - MBUSD Internet Usage ...

Name __________________________ Date ____________________ Period _____ Score out of 8 _____ Corrected by ________________________

Photosynthesis PowerPoint Notes

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

To stay alive, you need a constant supply of___________. You need energy to move, think, grow, and even sleep. Where does that energy come from? It all starts with the ________. Plant cells ___________energy from the sun in the form of _____________.

What is photosynthesis? A solar calculator has solar cells that convert light energy into electrical energy. The electrical energy

powers the calculator. A plant cell has _____________ that work much like solar cells found in calculators. Chloroplasts also ___________ ___________ in a process called ________________. Photosynthesis is a ___________ ___________that takes place in the chloroplasts of ___________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.

Label and color the diagram of 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.

Your eyes see sunlight as _________ _________, but it is really made up of different _________ of light. A clear _________ can split white light into a rainbow of color.

Light is part of a collection of waves known

as the ______________ _____________. Light is a _________, like a ripple on a

pond. Waves can be described by their

______________ (the length from peak to peak), and their _________. Light waves have very _________

wavelengths. They range from 800 nm (red light) to 400 nm (violet 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 visible light have different _____________. _________ light has the lowest energy and ___________ light has the highest energy. As we move through the rainbow from red to violet, the energy of the light ____________.

Why most plants are 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 red and blue light to grow. Chlorophyll absorbs mostly_________ and _________ light, and reflects _________ light. This

is why most plants look green.

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

_________ some light to avoid absorbing too much _________ and ______________. Also, certain colors of visible light have just the right amount of _________ to make photosynthesis occur. Ultraviolet light has more energy but would cause other _________ _________. Infrared light has too little _________ to make photosynthesis occur.

Why do leaves change color?

In some parts of the world, the leaves of some plants, such as sugar maple trees, _________ brilliant red or gold in the autumn. Chlorophyll _________ other plant pigments during the spring and summer. In the autumn, photosynthesis _________ down. Chlorophyll breaks down; and red, orange, and yellow ____________ in the leaves are revealed!

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