“Stop and Think” Page 329 The chemical energy in gasoline is converted into mechanical energy to make a car move. Give another example of energy being converted from one form to another. Where do plants get their energy? Explain why the following statement is incorrect: Plants get their food from the soil. Imagine the discovery of a new desert plant that has a unique pigment in its leaves called azurephyll. This pigment absorbs all the sunlight from green light to red light. If you observed this plant in the desert, what color would the leaves appear to be? Why?
“Stop and Think” Page 329 Food energy is converted to mechanical energy in your body. Electrical energy is converted to light energy…. Plants get their energy from the Sun. Incorrect, plants do not eat food like humans. They make their food through photosynthesis. Soil provides NUTRIENTS, not food. Leaves would appear blue because the pigment would not absorb light in the blue part of the light spectrum. It would instead reflect the blue light. (What does this tell us about the green color of plants?)
“Reflect and Connect” Page 334 • Complete the following tasks about photosynthesis. • Where in the plant cell does photosynthesis occur? • List 3 or more ways that plants use 3-carbon sugars produced during photosynthesis. • Describe why you think the carbon skeletons supplied by the 3-carbon sugars might be important for organisms that eat plants • What is the source of the mass increase in plants during their growth? Where does the matter come from that plants use to build their structures? • How do plants benefit from the Sun’s energy. • Explain Why some parts of the leaves in the previous activity contained more starch than other parts.
“Reflect and Connect” Page 334 • Create a concept map of the processes of photosynthesis using the following words and any other words you would like to add. Remember to use verbs to connect the concepts to show relationships. Arrange the concept map so that the most universal concepts is at the top. • Light Energy • Photosynthesis • Chemical Energy • Chloroplast • Water • Carbon Dioxide • Oxygen
“Reflect and Connect” Page 334 • 1a) Photosynthesis occurs in the chloroplasts within the chlorophyll. • 1b) 3-Carbon sugars are used to make sugar to supply the plant with energy. 3-Carbon sugars supply energy and carbon skeletons, or are used for maintenance and growth • 1c) Carbon skeletons provide food for organisms to eat plants, or provide matter for organisms that eat plants • The source of mass for plants is carbon dioxide • Plants use the Sun’s energy to make their own food • Parts of the leaves contained starch more than other parts because photosynthesis was unable to occur in the cells that were covered. Light is necessary for photosynthesis
Photosynthesis Concept Map What two phases? Photosynthesis INPUTS What Energy? What Energy? Uses? Produces? Gives off? Uses? OUTPUTS Takes Place in?
Pigment • Molecules that absorb specific wavelengths of light • Chlorophyll reflects green
ATP • Adenosine Triphosphate • Stores energy in high energy bonds between phosphates • Formed during photosynthesis and acts like a biological battery