PowerPoint Presentation

Photosynthesis

1What does photosynthesis mean?It means "putting together with light."

Click on the link to learn more about photosynthesis.http://www.neok12.com/php/watch.php?v=zX5f4866425a444c725f6045&t=Photosynthesis

6H2O + 6CO2 ----------> C6H12O6+ 6O2

Most of us don't speak chemicalese, so the above chemical equation translates as:six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen

Animals inhale oxygen and exhale carbon dioxide. Green plants are the only plants that produce oxygen and make food, which is called photosynthesis. Photosynthesis means ''putting together with light.'' This takes place in chloroplasts, which have chlorophyll in them. Chlorophyll absorbs the sunlight. From sunlight, green plants combine carbon dioxide and water to make sugar and oxygen. Green plants use sugar to make starch, fats, and proteins. There are tiny pores called stomata. Carbon dioxide and oxygen enter and leave through the stomata .

Do plants sleep? Yes. At night time, plants cannot make food, so they shut down by closing their stomata.

Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells.The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.

Water enters the root and is transported up to the leaves through specialized plant cells known as xylem (pronounces zigh-lem). Land plants must guard against drying out (desiccation) and so have evolved specialized structures known as stomata to allow gas to enter and leave the leaf. Carbon dioxide cannot pass through the protective waxy layer covering the leaf (cuticle), but it can enter the leaf through an opening (the stoma; plural = stomata; Greek for hole) flanked by two guard cells. Likewise, oxygen produced during photosynthesis can only pass out of the leaf through the opened stomata. Unfortunately for the plant, while these gases are moving between the inside and outside of the leaf, a great deal water is also lost. Cottonwood trees, for example, will lose 100 gallons of water per hour during hot desert days.

Here are some web sites I used. Look more closely at them.When you are finished your assignment is to make a quiz for a friend using Microsoft Word. Make sure you make an answer key. You may add clip art. Save it to your homedrive and we will use them as reviews.

http://www.neok12.com/php/watch.php?v=zX5f4866425a444c725f6045&t=Photosynthesis

http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BiobookPS.html

http://www.encyclopedia.com/topic/photosynthesis.aspx

http://www.bing.com/images/search?q=photosynthesis&FORM=IGRE&qpvt=photosynthesis&adlt=strict

http://www.answers.com/topic/photosynthesis

http://www.neok12.com/php/watch.php?v=zX5f4866425a444c725f6045&t=Photosynthesis