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BSCS
Unit 1, Chapter 4
Autotrophy: Collecting Energy from the Nonliving Environment
1. Autotrophs make their own food. Name and describe the different types of autotrophs.
2. What is the visible light spectrum? Remember ROYGBIV? Which “color” has the longest
wavelength? The lowest frequency? The shortest wavelength? The highest frequency?
3. Why, when we look at plants, do we see the color green?
4. What is the pigment that captures light in plants?
5. What is the name of the cell part in a plant cell that contains this pigment?
6. What is the structure of this organelle?
7. What are the three energy conversions involved in the process of photosynthesis?
8. Define photosynthesis. Write the chemical formula for it.
9. Differentiate between absorption spectra for chlorophyll a and b. Which wavelengths
do these chlorophylls absorb most? Least?
10. How does chlorophyll b differ from chlorophyll a?
11. Why are leaves different colors in the fall?
12. Describe van Helmont’s experiment 200 years ago.
13. What did he miss?
14. How do plants convert light energy into chemical energy in the form of glucose?
15. Be able to explain Photosystems I and II. What part of the chemical equation is used
and what is produced? What is oxidized? What is reduced? Where does it take place?
What is chemisomosis?
16. Read the Focus article on p. 110. How is bacteriorhodopsin similar to and different
from the pigment rhodopsin found in human retinal tissue?
17. Explain the Calvin cycle. Where does it occur? What is used? What is produced?
18. What affects the rate of photosynthesis?
19. What is photoinhibition? What causes it?
20. What is photorespiration? What are its advantages? Its disadvantages?
21. Differentiate between C-4, C-3, and CAM photosynthesis as mechanisms.
22. What organisms carry out photosynthesis?