Ch.10 - PhotosynthesisWorksheetSee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology
Light Reactions
Calvin Cycle
The Need for CO2
Additional Practice
Photosynthesis Review
The rise of photosynthetic organisms increased the concentration of CO 2 in the atmosphere, raised global temperature and raised sea level. a. Trueb. False
For most lawn grasses to grow well in hot, dry weather, they must be watered so that their stomata will remain open for longer periods of time to let in O2. a. Trueb. False
Which of the following statements about PEP carboxylase (the enzyme responsible for “fixing” CO2 in C4 plants) is  false?a. PEP carboxylase has a greater affinity for CO2 than rubisco does.b. PEP carboxylase is not found in C3 plants. c. PEP carboxylase can function when the stomata are closed.d. None of the above. 
Which plants are best adapted to cool wet conditions? a. C4b. C3c. CAM
Which plants keep their stomata open only at night? a. CAMb. C3c. C4
Why is photorespiration more of a problem for a plant when their stomata are closed? a. Oxygen levels increase from photosynthesis and compete with carbon dioxide for rubisco's active site.b. Carbon dioxide levels increase from photosynthesis and compete with oxygen for rubisco's active site.d. Oxygen cannot enter the leaf, blocking normal respiration, so the plants switch to photorespiration.e. Glucose cannot leave through the stomata and levels increase inside of the plant cell, causing dehydration by osmosis.
How do C4 plants minimize photorespiration? a. Stomata are only opened at night, storing oxygen in malate. During the day the oxygen is released for photosynthesis.b. The light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco.c. Stomata are only opened at night, storing carbon dioxide in malate. During the day the carbon dioxide is released for photosynthesis.d. The light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco.
Describe the structure and function of stomata in the leaves. How does their function relate to movement of substances in xylem and phloem?
Compare C3, C4 and CAM mechanisms of photosynthesis. a) What are the molecules that accept CO2 in each of the mechanisms? b) What are the products of CO2 fixation? c) What are the first enzymes in CO2 fixation, where are they located? 
Which type of plant (C3, C4, or CAM) might you expect to do best if exposed to continuous daylight under hot, dry conditions? Why?
 Describe the fundamental differences between C3, C4, and CAM plants in terms of how they carry out photosynthesis.