Transcript Chap 7 Photosynthesis RC ST (Students)

“Stop and Think” Page 329
1. 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.
2. Where do plants get their energy?
3. Explain why the following statement is incorrect: Plants get
their food from the soil.
4. 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
1. Food energy is converted to mechanical energy in your
body. Electrical energy is converted to light energy….
2. Plants get their energy from the Sun.
3. Incorrect, plants do not eat food like humans. They make
their food through photosynthesis. Soil provides NUTRIENTS,
not food.
4. 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
1. Complete the following tasks about photosynthesis.
a) Where in the plant cell does photosynthesis occur?
b) List 3 or more ways that plants use 3-carbon sugars
produced during photosynthesis.
c) Describe why you think the carbon skeletons supplied by
the 3-carbon sugars might be important for organisms
that eat plants
2. 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?
3. How do plants benefit from the Sun’s energy.
4. Explain Why some parts of the leaves in the previous activity
contained more starch than other parts.
“Reflect and Connect” Page 334
5. 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
2. The source of mass for plants is carbon dioxide
3. Plants use the Sun’s energy to make their own food
4. 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?
Takes Place in?
OUTPUTS
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