SCIENCE STANDARD 4: The Living Environment<br />4.4.4 – Observe and describe that some source of energy is needed for all organisms to stay alive and grow.<br /><ul><li> Taken from: </li></ul>http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx<br /><ul><li> Link to activity:</li></ul>http://www.indianastandardsresources.org/files/sci/sci_4_4_4.pdf<br />
Definitions<br /><ul><li> BASIC NEEDS: necessity of survival
PHOTOSYNTHESIS: the process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct.
OBSERVATIONS: the act of noting and recording something
ENERGY: the capacity or power to do work</li></ul>Taken from: www.thefreedictionary.com<br />
Background Information<br />The leaf is the primary site of photosynthesis in plants. Photosynthesis (photo=light, synthesis=putting together), generally, is the synthesis of sugar from light, carbon dioxide and water, with oxygen as a waste product. It is arguably the most important biochemical pathway known; nearly all life depends on it. It is an extremely complex process, comprised of many coordinated biochemical reactions. It occurs in higher plants, algae, some bacteria, and some protists, organisms collectively referred to as photoautotrophs. <br />Taken from: http://www.mongabay.com/reference/eco/Photosynthesis.html<br />
What are the basic needs of all organisms?<br /><ul><li> Food
Space</li></li></ul><li>Discussion<br />One of the basic needs of organisms is energy. <br />Discuss with students…<br /><ul><li>how plants get energy
plants making their own food/energy through photosynthesis
Carbon Dioxide + Water + Sunlight → Oxygen + Sugar + Water</li></ul>Ask students…<br /><ul><li> Could plants produce sugar/energy without the sun’s light?
What would happen to a plant that did not have sunlight?</li></li></ul><li>Meeting basic needs<br /><ul><li> Show students a large leaf plant.
Have students decide where to put the plant.</li></ul> - by a window where it gets sunlight<br /><ul><li> Also have students decide what to do to make sure the plant has all of its basic needs met.</li></ul> - water it daily or as needed, sunlight, etc.<br />
Testing Essential Energy<br /><ul><li> Place foil completely around several of the plant leaves. Ask students: “Do you think the foil will keep these leaves from getting their basic needs? What do you think would happen if we left these leaves covered with foil for five days? Will these foil-covered leaves have the energy they need to live and grow?”
Predict what will happen to the leaves with foil and the leaves without foil.
Every day for five days the children will check the covered and uncovered leaves of the plant and record their observations.
On the fifth day, ask students: “Why did the leaves covered with foil change? Why did they not have energy to live and grow? Look back to the photosynthesis equation. What ingredient were these leaves missing?”</li></li></ul><li>Photosynthesisby Alvin Silverstein<br />AMAZON REVIEW: <br />Very readable introduction to photosynthesis. Includes some great facts like a single maple tree can produce 2 tons of food (sugar) in one sunny day. Photos are good. Includes a glossary, additional resource list, and index<br />
REFERENCES<br />Book<br /><ul><li>Silverstein, A., Silverstein V., Nunn L. (2007). Photosynthesis. Twenty-First Century Books.</li></ul>Websites<br /><ul><li>http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx