At what stage(s) is carbon dioxide needed in photosynthesis?
A. At the very beginning of the light reactions
B. At the end of the light reactions
C. During both the light reactions and the Calvin cycle
D. During the Calvin cycle
Answer: D
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Why are maximum rates of water flow higher in angiosperms than in gymnosperms?
A. Angiosperms have tracheids and gymnosperms have vessels. B. Angiosperms have longer and wider xylem conduits than gymnosperms. C. Angiosperms have pits. D. Angiosperms require more H2O than gymnosperms.
Dinosaurs flourished during the ____ era
a. Archaean b. Paleozoic c. Mesozoic d. Cambrian e. Cenozoic
Which of the following statements about the role of fire in biomes / ecosystems is true?
A) Forest fires did not occur in the times before human settlement. B) Fires decrease the number of animal communities in ecosystems by destroying habitat. C) Forest fires are extremely destructive to ecosystems and should be put out as quickly as possible. D) Fire is essential to maintaining some ecosystems. E) Fire is not an important factor in developing and maintaining ecosystems.
If a pink snapdragon is self-fertilized, the offspring are red, pink, or white. What type of inheritance pattern does flower color exhibit in this example?
A. codominance B. incomplete dominance C. recessive D. incomplete recessive E. dominance