Name:
ANSWER KEY
Period:
Making Carbon Compounds
Date:
Read: Making Carbon Compounds (p. 330-333)
1. What are the 3 major steps in photosynthesis?
(1) Absorption of light energy
(2) Conversion of light energy into chemical energy
(3) Storage of chemical energy in sugar
a. What is ATP?
ATP, adenosine triphosphate, is a form of chemical energy.
b. What happens in the Light-Dependent Reactions?
Requires the presence of sunlight. Sunlight hits a chlorophyll
molecule in a chloroplast. This starts a series of reactions that
convert light energy into ATP, chemical energy.
c. What happens in the Light-Independent Reactions?
Does NOT require light but it does require ATP. Occur
simultaneously with the light-dependent reactions. Carbon
molecules combine to produce sugars, chemical energy.
2. Draw a picture that captures what is going on in a Chloroplast (See Fig 7.6 p.331)
3. Draw the fate of 3-carbon sugars (p. 332) in plants and explain what is going on?
Plants use the sugars produced in photosynthesis to supply energy
and carbon skeletons for biosynthesis and other energy requiring
processes.
a. What is the Calvin Cycle and where does it occur?
The Calvin Cycle is referred to as the Light-Independent
reactions.
b. What is Carbon Fixation?
When carbon dioxide is added to an existing 5-carbon sugar,
creating two 3-carbon sugars.
4. After a plant makes sugar. What 3 things can it do with it now?
(1)
Sucrose
(2)
Starch
(3)
Cellulose
5. Describe why you think the carbon skeleton of sugars might be important to organisms that
eat plants. (think about what you learned in Ch6)
Animals cannot make their own energy, therefore, they must eat
plants or other animals in order to get the energy they need to
function.
6. What is the SOURCE of the mass increase (what do they use to get bigger) in plants during
their growth?
Carbon Dioxide
CO2 à O2
(plant keeps the Carbon)
7. Where does that matter come from that plants use to build their structures?
The matter comes from the sugars.
8. Create a concept map of the process 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 concept is at the
top.
Light Energy, Photosynthesis, Chemical Energy, Chloroplast, Water, Carbon Dioxide, and
Oxygen.