Each of the following is a plant hormone except
A) brassinosteroids
B) abscisic acid.
C) ethylene.
D) All the above are plant hormones.
E) None of the above are plant hormones.
Answer: D
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An inanimate material (solid object, liquid, or air) that serves as a transmission agent for pathogens is called ______.
Fill in the blank(s) with the appropriate word(s).
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________
A) first line of defense B) second line of defense C) third line of defense D) first and second lines of defense
Which of the following is true of archaea that produce methane?
A. they reduce carbon dioxide in the presence of nitrogen B. they live in the most extreme environments C. they are always anaerobes D. they have been discovered on Mars
For many plants to grow well in hot, dry weather, they must be watered so their stomata will remain open for longer periods of time to let in oxygen.
a. true b. false