Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You
repeat Engelmann's classic experiment using this new organism in place of Spirogyra and find that
oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this
tell you?
a. The sun of this new planet emits different wavelengths of light than our own.
b. This new organism is using yellow and green light to drive photosynthesis.
c. This organism is green just like plants on Earth.
d. This organism utilizes the most energy-rich photons of the spectrum.
e. This new organism is using blue and red light to drive photosynthesis.
B
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Which of the following is a micronutrient necessary for plants?
a. chlorine b. nitrogen c. phosphorus d. potassium
Which group of organisms is primarily monogamous?
a. Crayfish b. Mammals c. Reptiles d. Birds e. Fish
The process by which species cease to exist
A. All of the answer choices are correct. B. is endangerment. C. is speciation. D. is extinction. E. has never occurred.
Packages of vegetable seeds typically include an ideal planting depth. If planted too deep, the seeds will not germinate. Why will an excess depth affect the germination of the plant?
A. Circadian rhythms are disrupted. B. Thigmotropism is disrupted. C. Statoliths can no longer move. D. Phytochromes can no longer absorb light. E. The apical meristem cannot reach the surface of the soil.