A plant seedling bends toward sunlight because _____
A) auxin migrates to the lower part of the stem due to gravity
B) there is more auxin on the light side of the stem
C) auxin is destroyed more quickly on the dark side of the stem
D) auxin is found in greatest abundance on the dark side of the stem
E) gibberellins produced at the stem tip cause phototropism
Answer: D
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a. Two b. Three c. Six d. Nine e. Twelve
In 1956, people in Minamata, Japan, began to exhibit severe neurological disorders and birth defects
This problem was eventually attributed to methylmercury, a water-insoluble and breakdown-resistant chemical formed from mercury dumped into the adjacent bay by a local factory. Which of the following types of seafood would have the highest levels of methylmercury, and therefore cause the severest effects? A) Krill (small crustaceans that eat tiny microscopic algae) B) Tuna that feed on smaller fish that feed on krill that feed on algae C) Sea urchins that feed on kelp D) Kelp (large, multicellular, photosynthetic protists) E) Mussels that feed on tiny microscopic algae
Why is the concentration of carbon dioxide in Earth's atmosphere rapidly increasing?
A) More photosynthesis is occurring. B) Earth is warming. C) The oceans are cooling. D) The ozone layer has become much thinner. E) Many human activities release carbon dioxide.
Play inhibits normal behavioral development
Indicate whether the statement is true or false